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cve-2021-1446
Vulnerability from cvelistv5
Published
2021-03-24 20:06
Modified
2024-09-16 22:46
Severity ?
EPSS score ?
Summary
Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway Denial of Service Vulnerability
References
Impacted products
| ▼ | Vendor | Product |
|---|---|---|
| Cisco | Cisco IOS XE Software |
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Advisory\"]}]}}"
}
}
icsa-22-300-03
Vulnerability from csaf_cisa
Published
2022-10-27 00:00
Modified
2022-10-27 00:00
Summary
Rockwell Automation Stratix Devices Containing Cisco IOS
Notes
CISA Disclaimer
This CSAF advisory was extracted from unstructured data and may contain inaccuracies. If you notice any errors, please reach out to the designated contact at CISA CSAF: central@cisa.dhs.gov
Legal Notice
All information products included in https://us-cert.cisa.gov/ics are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.
Risk evaluation
Successful exploitation of these vulnerabilities could lead to a denial-of-service condition and allow remote code execution.
Critical infrastructure sectors
Multiple
Countries/areas deployed
Worldwide
Company headquarters location
United States
Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability these vulnerabilities. Specifically, users should:
Recommended Practices
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
Recommended Practices
CISA also provides a section for control systems security recommended practices on the ICS webpage at cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Recommended Practices
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
Recommended Practices
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Exploitability
No known public exploits specifically target these vulnerabilities.
{
"document": {
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"organization": "Rockwell Automation",
"summary": "reporting these vulnerabilities to CISA"
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"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
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"notes": [
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"category": "general",
"text": "This CSAF advisory was extracted from unstructured data and may contain inaccuracies. If you notice any errors, please reach out to the designated contact at CISA CSAF: central@cisa.dhs.gov",
"title": "CISA Disclaimer"
},
{
"category": "legal_disclaimer",
"text": "All information products included in https://us-cert.cisa.gov/ics are provided \"as is\" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.",
"title": "Legal Notice"
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"text": "Successful exploitation of these vulnerabilities could lead to a denial-of-service condition and allow remote code execution. ",
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"category": "other",
"text": "Multiple",
"title": "Critical infrastructure sectors"
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"title": "Recommended Practices"
},
{
"category": "general",
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"title": "Recommended Practices"
},
{
"category": "general",
"text": "Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.",
"title": "Recommended Practices"
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{
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},
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"publisher": {
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"contact_details": "Email: CISAservicedesk@cisa.dhs.gov;\n Toll Free: 1-888-282-0870",
"name": "CISA",
"namespace": "https://www.cisa.gov/"
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"references": [
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"category": "self",
"summary": "ICS Advisory ICSA-22-300-03 JSON",
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},
{
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"url": "https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01"
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"url": "https://www.cisa.gov/news-events/ics-advisories/icsa-22-300-03"
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"url": "https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf"
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],
"title": "Rockwell Automation Stratix Devices Containing Cisco IOS",
"tracking": {
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"vulnerabilities": [
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"cwe": {
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"name": "Incorrect Authorization"
},
"notes": [
{
"category": "summary",
"text": "The administrator graphical user interface (GUI) lacks correct handling of RBAC, which may allow a malicious user to send modified HTTP requests to the targeted device. If exploited, a read-only remote attacker could potentially execute commands or configuration changes as the administrator.CVE-2020-3229 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).",
"title": "Vulnerability Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-0001"
]
},
"references": [
{
"category": "external",
"summary": "web.nvd.nist.gov",
"url": "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-3229"
},
{
"category": "external",
"summary": "www.first.org",
"url": "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"remediations": [
{
"category": "mitigation",
"details": "Rockwell Automation has addressed these vulnerabilities updates and encourages users to combine these updates with Rockwell Automation\u0027s Security Best Practices:",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1085012/loc/en_US#__highlight"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.0"
},
"products": [
"CSAFPID-0001"
]
}
]
},
{
"cve": "CVE-2020-3219",
"cwe": {
"id": "CWE-20",
"name": "Improper Input Validation"
},
"notes": [
{
"category": "summary",
"text": "Due to insufficient validation of user input, this vulnerability could allow a malicious user to inject custom input into the web user interface. If exploited, a remote attacker could potentially execute arbitrary code with administrative privileges on the operating system.CVE-2020-3219 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).",
"title": "Vulnerability Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-0001"
]
},
"references": [
{
"category": "external",
"summary": "web.nvd.nist.gov",
"url": "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-3219"
},
{
"category": "external",
"summary": "www.first.org",
"url": "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"remediations": [
{
"category": "mitigation",
"details": "Rockwell Automation has addressed these vulnerabilities updates and encourages users to combine these updates with Rockwell Automation\u0027s Security Best Practices:",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1085012/loc/en_US#__highlight"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.0"
},
"products": [
"CSAFPID-0001"
]
}
]
},
{
"cve": "CVE-2021-1446",
"cwe": {
"id": "CWE-754",
"name": "Improper Check for Unusual or Exceptional Conditions"
},
"notes": [
{
"category": "summary",
"text": "A vulnerability in the DNS application layer gateway (ALG) functionality used by Network Address Translation (NAT) in Cisco IOS XE software could allow an unauthenticated, remote attacker to reload an affected device.CVE-2021-1446 has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).",
"title": "Vulnerability Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-0001"
]
},
"references": [
{
"category": "external",
"summary": "web.nvd.nist.gov",
"url": "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-1446"
},
{
"category": "external",
"summary": "www.first.org",
"url": "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"
}
],
"remediations": [
{
"category": "mitigation",
"details": "Rockwell Automation has addressed these vulnerabilities updates and encourages users to combine these updates with Rockwell Automation\u0027s Security Best Practices:",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1085012/loc/en_US#__highlight"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 8.6,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"version": "3.0"
},
"products": [
"CSAFPID-0001"
]
}
]
},
{
"cve": "CVE-2020-3200",
"cwe": {
"id": "CWE-436",
"name": "Interpretation Conflict"
},
"notes": [
{
"category": "summary",
"text": "A vulnerability in the Secure Shell (SSH) server code of Cisco IOS software and Cisco IOS XE software could allow an authenticated, remote attacker to reload an affected device.CVE-2020-3200 has been assigned to this vulnerability. A CVSS v3 base score of 7.7 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H).",
"title": "Vulnerability Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-0001",
"CSAFPID-0002"
]
},
"references": [
{
"category": "external",
"summary": "web.nvd.nist.gov",
"url": "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-3200"
},
{
"category": "external",
"summary": "www.first.org",
"url": "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H"
}
],
"remediations": [
{
"category": "mitigation",
"details": "Rockwell Automation has addressed these vulnerabilities updates and encourages users to combine these updates with Rockwell Automation\u0027s Security Best Practices:",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1085012/loc/en_US#__highlight"
},
{
"category": "mitigation",
"details": "Stratix 5800 switches (All listed vulnerabilities except CVE-2020-3200): Update to Stratix 5800 v17.04.01 or later",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://compatibility.rockwellautomation.com/Pages/ProductReplacement.aspx?crumb=101\u0026restore=1\u0026vid=59821"
},
{
"category": "mitigation",
"details": "Stratix 5800 switches (CVE-2020-3200): Update to v16.12.01 or later",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://compatibility.rockwellautomation.com/Pages/ProductReplacement.aspx?crumb=101\u0026restore=1\u0026vid=59821"
},
{
"category": "mitigation",
"details": "Stratix 5400/5410 switches (CVE-2020-3200 only): Update to v15.2(7)E2 or later",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://compatibility.rockwellautomation.com/Pages/ProductReplacement.aspx?crumb=101\u0026restore=1\u0026vid=59065"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 7.7,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
"version": "3.0"
},
"products": [
"CSAFPID-0001",
"CSAFPID-0002"
]
}
]
},
{
"cve": "CVE-2020-3211",
"cwe": {
"id": "CWE-78",
"name": "Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)"
},
"notes": [
{
"category": "summary",
"text": "Due to improper input sanitization, this vulnerability could allow a malicious user with administrative privileges to submit specially crafted input in the web user interface. If exploited, a remote attacker could potentially execute arbitrary commands with root privileges on the operating system.CVE-2020-3211 has been assigned to this vulnerability. A CVSS v3 base score of 7.2 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).",
"title": "Vulnerability Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-0001"
]
},
"references": [
{
"category": "external",
"summary": "web.nvd.nist.gov",
"url": "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-3211"
},
{
"category": "external",
"summary": "www.first.org",
"url": "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"
}
],
"remediations": [
{
"category": "mitigation",
"details": "Rockwell Automation has addressed these vulnerabilities updates and encourages users to combine these updates with Rockwell Automation\u0027s Security Best Practices:",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1085012/loc/en_US#__highlight"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 7.2,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"version": "3.0"
},
"products": [
"CSAFPID-0001"
]
}
]
},
{
"cve": "CVE-2020-3218",
"cwe": {
"id": "CWE-20",
"name": "Improper Input Validation"
},
"notes": [
{
"category": "summary",
"text": "Due to improper validation of user supplied input, a malicious user could potentially create a file on the target device and upload a second malicious file to the device. If exploited, a user could execute arbitrary code with root privileges on the underlying Linux shell.CVE-2020-3218 has been assigned to this vulnerability. A CVSS v3 base score of 7.2 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).",
"title": "Vulnerability Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-0001"
]
},
"references": [
{
"category": "external",
"summary": "web.nvd.nist.gov",
"url": "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-3218"
},
{
"category": "external",
"summary": "www.first.org",
"url": "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H"
}
],
"remediations": [
{
"category": "mitigation",
"details": "Rockwell Automation has addressed these vulnerabilities updates and encourages users to combine these updates with Rockwell Automation\u0027s Security Best Practices:",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1085012/loc/en_US#__highlight"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 7.2,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"version": "3.0"
},
"products": [
"CSAFPID-0001"
]
}
]
},
{
"cve": "CVE-2020-3209",
"cwe": {
"id": "CWE-347",
"name": "Improper Verification of Cryptographic Signature"
},
"notes": [
{
"category": "summary",
"text": "During the initial boot process, there is an improper check on the area code managing the verification of the digital signatures of the system files. If exploited, a malicious user could potentially install and boot malicious software images or execute unsigned binaries on the targeted device. A malicious user could exploit this vulnerability by loading unsigned software on the affected device.CVE-2020-3209 has been assigned to this vulnerability. A CVSS v3 base score of 6.8 has been assigned; the CVSS vector string is (AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).",
"title": "Vulnerability Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-0001"
]
},
"references": [
{
"category": "external",
"summary": "web.nvd.nist.gov",
"url": "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-3209"
},
{
"category": "external",
"summary": "www.first.org",
"url": "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"remediations": [
{
"category": "mitigation",
"details": "Rockwell Automation has addressed these vulnerabilities updates and encourages users to combine these updates with Rockwell Automation\u0027s Security Best Practices:",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1085012/loc/en_US#__highlight"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 6.8,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.0"
},
"products": [
"CSAFPID-0001"
]
}
]
},
{
"cve": "CVE-2021-1385",
"cwe": {
"id": "CWE-22",
"name": "Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)"
},
"notes": [
{
"category": "summary",
"text": "A vulnerability in the Cisco IOx application hosting environment of multiple Cisco platforms could allow an authenticated, remote attacker to conduct directory traversal attacks and read and write files on the underlying operating system or host system.CVE-2021-1385 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N).",
"title": "Vulnerability Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-0001"
]
},
"references": [
{
"category": "external",
"summary": "web.nvd.nist.gov",
"url": "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-1385"
},
{
"category": "external",
"summary": "www.first.org",
"url": "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N"
}
],
"remediations": [
{
"category": "mitigation",
"details": "Rockwell Automation has addressed these vulnerabilities updates and encourages users to combine these updates with Rockwell Automation\u0027s Security Best Practices:",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1085012/loc/en_US#__highlight"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N",
"version": "3.0"
},
"products": [
"CSAFPID-0001"
]
}
]
},
{
"cve": "CVE-2020-3516",
"cwe": {
"id": "CWE-20",
"name": "Improper Input Validation"
},
"notes": [
{
"category": "summary",
"text": "A vulnerability in the web server authentication of Cisco IOS XE Software could allow an authenticated, remote attacker to crash the web server on the device.CVE-2020-3516 has been assigned to this vulnerability. A CVSS v3 base score of 4.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L).",
"title": "Vulnerability Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-0001"
]
},
"references": [
{
"category": "external",
"summary": "web.nvd.nist.gov",
"url": "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-3516"
},
{
"category": "external",
"summary": "www.first.org",
"url": "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"
}
],
"remediations": [
{
"category": "mitigation",
"details": "Rockwell Automation has addressed these vulnerabilities updates and encourages users to combine these updates with Rockwell Automation\u0027s Security Best Practices:",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1085012/loc/en_US#__highlight"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
"version": "3.0"
},
"products": [
"CSAFPID-0001"
]
}
]
}
]
}
gsd-2021-1446
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
A vulnerability in the DNS application layer gateway (ALG) functionality used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a logic error that occurs when an affected device inspects certain DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through an affected device that is performing NAT for DNS packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device. The vulnerability can be exploited only by traffic that is sent through an affected device via IPv4 packets. The vulnerability cannot be exploited via IPv6 traffic.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-1446",
"description": "A vulnerability in the DNS application layer gateway (ALG) functionality used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a logic error that occurs when an affected device inspects certain DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through an affected device that is performing NAT for DNS packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device. The vulnerability can be exploited only by traffic that is sent through an affected device via IPv4 packets. The vulnerability cannot be exploited via IPv6 traffic.",
"id": "GSD-2021-1446"
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2021-1446"
],
"details": "A vulnerability in the DNS application layer gateway (ALG) functionality used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a logic error that occurs when an affected device inspects certain DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through an affected device that is performing NAT for DNS packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device. The vulnerability can be exploited only by traffic that is sent through an affected device via IPv4 packets. The vulnerability cannot be exploited via IPv6 traffic.",
"id": "GSD-2021-1446",
"modified": "2023-12-13T01:23:22.409409Z",
"schema_version": "1.4.0"
}
},
"namespaces": {
"cve.org": {
"CVE_data_meta": {
"ASSIGNER": "psirt@cisco.com",
"DATE_PUBLIC": "2021-03-24T16:00:00",
"ID": "CVE-2021-1446",
"STATE": "PUBLIC",
"TITLE": "Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway Denial of Service Vulnerability"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "Cisco IOS XE Software ",
"version": {
"version_data": [
{
"version_value": "n/a"
}
]
}
}
]
},
"vendor_name": "Cisco"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "A vulnerability in the DNS application layer gateway (ALG) functionality used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a logic error that occurs when an affected device inspects certain DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through an affected device that is performing NAT for DNS packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device. The vulnerability can be exploited only by traffic that is sent through an affected device via IPv4 packets. The vulnerability cannot be exploited via IPv6 traffic."
}
]
},
"exploit": [
{
"lang": "eng",
"value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. "
}
],
"impact": {
"cvss": {
"baseScore": "8.6",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H ",
"version": "3.0"
}
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "CWE-754"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "20210324 Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway Denial of Service Vulnerability",
"refsource": "CISCO",
"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-alg-dos-hbBS7SZE"
}
]
},
"source": {
"advisory": "cisco-sa-alg-dos-hbBS7SZE",
"defect": [
[
"CSCvv65113"
]
],
"discovery": "INTERNAL"
}
},
"nvd.nist.gov": {
"configurations": {
"CVE_data_version": "4.0",
"nodes": [
{
"children": [],
"cpe_match": [
{
"cpe23Uri": "cpe:2.3:o:cisco:ios_xe:3.7.0bs:*:*:*:*:*:*:*",
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"vulnerable": true
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"vulnerable": true
},
{
"cpe23Uri": "cpe:2.3:o:cisco:ios_xe:17.2.1v:*:*:*:*:*:*:*",
"cpe_name": [],
"vulnerable": true
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"cpe_name": [],
"vulnerable": true
},
{
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"cpe_name": [],
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},
{
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"cpe_name": [],
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},
{
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"cpe_name": [],
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}
],
"operator": "OR"
}
]
},
"cve": {
"CVE_data_meta": {
"ASSIGNER": "psirt@cisco.com",
"ID": "CVE-2021-1446"
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "en",
"value": "A vulnerability in the DNS application layer gateway (ALG) functionality used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a logic error that occurs when an affected device inspects certain DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through an affected device that is performing NAT for DNS packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device. The vulnerability can be exploited only by traffic that is sent through an affected device via IPv4 packets. The vulnerability cannot be exploited via IPv6 traffic."
}
]
},
"problemtype": {
"problemtype_data": [
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"description": [
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"value": "CWE-754"
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"references": {
"reference_data": [
{
"name": "20210324 Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway Denial of Service Vulnerability",
"refsource": "CISCO",
"tags": [
"Vendor Advisory"
],
"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-alg-dos-hbBS7SZE"
}
]
}
},
"impact": {
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"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 7.1,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C",
"version": "2.0"
},
"exploitabilityScore": 8.6,
"impactScore": 6.9,
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},
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"baseScore": 7.5,
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"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
}
},
"lastModifiedDate": "2021-03-29T18:59Z",
"publishedDate": "2021-03-24T20:15Z"
}
}
}
cisco-sa-alg-dos-hbbs7sze
Vulnerability from csaf_cisco
Published
2021-03-24 16:00
Modified
2021-03-24 16:00
Summary
Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway Denial of Service Vulnerability
Notes
Summary
A vulnerability in the DNS application layer gateway (ALG) functionality used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload.
The vulnerability is due to a logic error that occurs when an affected device inspects certain DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through an affected device that is performing NAT for DNS packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device.
The vulnerability can be exploited only by traffic that is sent through an affected device via IPv4 packets. The vulnerability cannot be exploited via IPv6 traffic.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
This advisory is part of the March 2021 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: March 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74408"].
Vulnerable Products
This vulnerability affects Cisco devices if they are running a vulnerable release of Cisco IOS XE Software that is configured for NAT operation and has the DNS ALG feature enabled. The DNS ALG feature is enabled as soon as NAT is configured on the device.
Assess the NAT Configuration
1. Determine whether a device is configured to perform NAT
Administrators can determine whether NAT is active on the device (preferred) or whether NAT commands are present in the device configuration.
To determine whether NAT is active on a device, administrators can log in to the device and issue the show ip nat statistics command in the CLI. If NAT is active, the Outside interfaces and Inside interfaces sections of the command output will include at least one interface.
The following example shows the output of the show ip nat statistics command for a device where NAT is active:
Router# show ip nat statistics
Total active translations: 1 (0 static, 1 dynamic; 0 extended)
Outside interfaces:
GigabitEthernet0/0/3
Inside interfaces:
GigabitEthernet0/0/1
If the output of the show ip nat statistics command does not list any interfaces, NAT is not active on the device.
Alternatively, administrators can determine whether NAT is active on a device by issuing the show running-config command in the CLI and assessing whether NAT commands are present in the device configuration. If NAT is active on the device, the output of the show running-config command will include the ip nat inside and ip nat outside interface commands. In the case of the NAT Virtual Interface, the ip nat enable interface command will be present.
2. Determine whether DNS ALG is disabled in the NAT configuration
To determine whether the DNS ALG is disabled in the NAT configuration, use the show running-config | include ip nat service dns privileged EXEC command. The presence of both no ip nat service dns tcp and no ip nat service dns udp in the output of show running-config | include ip nat service dns indicates that the DNS ALG is disabled in the NAT configuration.
The following is the output of show running-config | include ip nat in Cisco IOS XE Software that has the DNS ALG disabled in the NAT configuration:
Router#show running-config | include ip nat service
no ip nat service dns tcp
no ip nat service dns udp
If both no ip nat service dns tcp and no ip nat service dns udp do not appear in the output of show running-config | include ip nat service dns, and the device runs an affected version of Cisco IOS XE Software with NAT enabled, that configuration is vulnerable.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products ["#vp"] section of this advisory are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following Cisco products:
IOS Software
IOS XR Software
NX-OS Software
Workarounds
There are no workarounds that address this vulnerability. However, a mitigation is available.
Administrators may mitigate this vulnerability by disabling the NAT ALG for DNS packets. However, this action may negatively impact normal operation of any device that sends or receives traffic through the affected device and, consequently, may disrupt normal network operations.
Administrators should verify that their network environment does not require use of a NAT ALG for DNS packets before they disable this functionality. To disable use of the NAT ALG for DNS packets, administrators can use the no ip nat service dns tcp and no ip nat service dns udp command in global configuration mode.
While this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
Fixed Software
Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html ["https://www.cisco.com/c/en/us/products/end-user-license-agreement.html"]
Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.
When considering software upgrades ["https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"], customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page ["https://www.cisco.com/go/psirt"], to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html ["https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"]
Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.
Cisco IOS and IOS XE Software
To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides the Cisco Software Checker ["https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"] to identify any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory (“First Fixed”). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified (“Combined First Fixed”).
Customers can use the Cisco Software Checker ["https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"] to search advisories in the following ways:
Choose the software and one or more releases
Upload a .txt file that includes a list of specific releases
Enter the output of the show version command
After initiating a search, customers can customize the search to include all Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication.
Customers can also use the following form to determine whether a release is affected by any Cisco Security Advisory by entering a Cisco IOS or IOS XE Software release—for example, 15.1(4)M2 or 3.13.8S:
By default, the Cisco Software Checker ["https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"] includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, customers can use the Cisco Software Checker on Cisco.com and check the Medium check box in the drop-down list under Impact Rating when customizing a search.
For a mapping of Cisco IOS XE Software releases to Cisco IOS Software releases, refer to the Cisco IOS XE 2 Release Notes ["https://www.cisco.com/c/en/us/td/docs/ios/ios_xe/2/release/notes/rnasr21/rnasr21_gen.html#wp3000032"], Cisco IOS XE 3S Release Notes ["https://www.cisco.com/c/en/us/td/docs/ios/ios_xe/3/release/notes/asr1k_rn_3s_rel_notes/asr1k_rn_3s_sys_req.html#wp3069754"], or Cisco IOS XE 3SG Release Notes ["https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/release/note/OL_24726.html#pgfId-2570252"], depending on the Cisco IOS XE Software release.
Vulnerability Policy
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy ["https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
Exploitation and Public Announcements
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
Source
This vulnerability was found during the resolution of a Cisco TAC support case.
Legal Disclaimer
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products.
{
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"summary": "This vulnerability was found during the resolution of a Cisco TAC support case."
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"category": "summary",
"text": "A vulnerability in the DNS application layer gateway (ALG) functionality used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload.\r\n\r\nThe vulnerability is due to a logic error that occurs when an affected device inspects certain DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through an affected device that is performing NAT for DNS packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device.\r\n\r\nThe vulnerability can be exploited only by traffic that is sent through an affected device via IPv4 packets. The vulnerability cannot be exploited via IPv6 traffic.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n\r\n\r\nThis advisory is part of the March 2021 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: March 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74408\"].",
"title": "Summary"
},
{
"category": "general",
"text": "This vulnerability affects Cisco devices if they are running a vulnerable release of Cisco IOS XE Software that is configured for NAT operation and has the DNS ALG feature enabled. The DNS ALG feature is enabled as soon as NAT is configured on the device.\r\n Assess the NAT Configuration\r\n1. Determine whether a device is configured to perform NAT\r\n\r\nAdministrators can determine whether NAT is active on the device (preferred) or whether NAT commands are present in the device configuration.\r\n\r\nTo determine whether NAT is active on a device, administrators can log in to the device and issue the show ip nat statistics command in the CLI. If NAT is active, the Outside interfaces and Inside interfaces sections of the command output will include at least one interface.\r\n\r\nThe following example shows the output of the show ip nat statistics command for a device where NAT is active:\r\n\r\n\r\nRouter# show ip nat statistics\r\n Total active translations: 1 (0 static, 1 dynamic; 0 extended)\r\nOutside interfaces:\r\n GigabitEthernet0/0/3\r\nInside interfaces:\r\n GigabitEthernet0/0/1\r\n\r\n\r\nIf the output of the show ip nat statistics command does not list any interfaces, NAT is not active on the device.\r\n\r\nAlternatively, administrators can determine whether NAT is active on a device by issuing the show running-config command in the CLI and assessing whether NAT commands are present in the device configuration. If NAT is active on the device, the output of the show running-config command will include the ip nat inside and ip nat outside interface commands. In the case of the NAT Virtual Interface, the ip nat enable interface command will be present.\r\n\r\n2. Determine whether DNS ALG is disabled in the NAT configuration\r\n\r\n\r\nTo determine whether the DNS ALG is disabled in the NAT configuration, use the show running-config | include ip nat service dns privileged EXEC command. The presence of both no ip nat service dns tcp and no ip nat service dns udp in the output of show running-config | include ip nat service dns indicates that the DNS ALG is disabled in the NAT configuration.\r\n\r\nThe following is the output of show running-config | include ip nat in Cisco IOS XE Software that has the DNS ALG disabled in the NAT configuration:\r\n\r\n\r\nRouter#show running-config | include ip nat service\r\nno ip nat service dns tcp\r\nno ip nat service dns udp\r\n\r\nIf both no ip nat service dns tcp and no ip nat service dns udp do not appear in the output of show running-config | include ip nat service dns, and the device runs an affected version of Cisco IOS XE Software with NAT enabled, that configuration is vulnerable.",
"title": "Vulnerable Products"
},
{
"category": "general",
"text": "Only products listed in the Vulnerable Products [\"#vp\"] section of this advisory are known to be affected by this vulnerability.\r\n\r\n Cisco has confirmed that this vulnerability does not affect the following Cisco products:\r\n\r\nIOS Software\r\nIOS XR Software\r\nNX-OS Software",
"title": "Products Confirmed Not Vulnerable"
},
{
"category": "general",
"text": "There are no workarounds that address this vulnerability. However, a mitigation is available.\r\n\r\nAdministrators may mitigate this vulnerability by disabling the NAT ALG for DNS packets. However, this action may negatively impact normal operation of any device that sends or receives traffic through the affected device and, consequently, may disrupt normal network operations.\r\n\r\nAdministrators should verify that their network environment does not require use of a NAT ALG for DNS packets before they disable this functionality. To disable use of the NAT ALG for DNS packets, administrators can use the no ip nat service dns tcp and no ip nat service dns udp command in global configuration mode.\r\n\r\nWhile this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.",
"title": "Workarounds"
},
{
"category": "general",
"text": "Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:\r\nhttps://www.cisco.com/c/en/us/products/end-user-license-agreement.html [\"https://www.cisco.com/c/en/us/products/end-user-license-agreement.html\"]\r\n\r\nAdditionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.\r\n\r\nWhen considering software upgrades [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"], customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page [\"https://www.cisco.com/go/psirt\"], to determine exposure and a complete upgrade solution.\r\n\r\nIn all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.\r\n Customers Without Service Contracts\r\nCustomers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html [\"https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html\"]\r\n\r\nCustomers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.\r\n Cisco IOS and IOS XE Software\r\nTo help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides the Cisco Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"] to identify any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory (\u201cFirst Fixed\u201d). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified (\u201cCombined First Fixed\u201d).\r\n\r\nCustomers can use the Cisco Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"] to search advisories in the following ways:\r\n\r\nChoose the software and one or more releases\r\nUpload a .txt file that includes a list of specific releases\r\nEnter the output of the show version command\r\n\r\nAfter initiating a search, customers can customize the search to include all Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication.\r\n\r\nCustomers can also use the following form to determine whether a release is affected by any Cisco Security Advisory by entering a Cisco IOS or IOS XE Software release\u2014for example, 15.1(4)M2 or 3.13.8S:\r\n\r\n\r\n\r\nBy default, the Cisco Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"] includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, customers can use the Cisco Software Checker on Cisco.com and check the Medium check box in the drop-down list under Impact Rating when customizing a search.\r\n\r\nFor a mapping of Cisco IOS XE Software releases to Cisco IOS Software releases, refer to the Cisco IOS XE 2 Release Notes [\"https://www.cisco.com/c/en/us/td/docs/ios/ios_xe/2/release/notes/rnasr21/rnasr21_gen.html#wp3000032\"], Cisco IOS XE 3S Release Notes [\"https://www.cisco.com/c/en/us/td/docs/ios/ios_xe/3/release/notes/asr1k_rn_3s_rel_notes/asr1k_rn_3s_sys_req.html#wp3069754\"], or Cisco IOS XE 3SG Release Notes [\"https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/release/note/OL_24726.html#pgfId-2570252\"], depending on the Cisco IOS XE Software release.",
"title": "Fixed Software"
},
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"category": "general",
"text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html\"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.",
"title": "Vulnerability Policy"
},
{
"category": "general",
"text": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.",
"title": "Exploitation and Public Announcements"
},
{
"category": "general",
"text": "This vulnerability was found during the resolution of a Cisco TAC support case.",
"title": "Source"
},
{
"category": "legal_disclaimer",
"text": "THIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.\r\n\r\nA standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products.",
"title": "Legal Disclaimer"
}
],
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"contact_details": "psirt@cisco.com",
"issuing_authority": "Cisco PSIRT",
"name": "Cisco",
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"references": [
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"category": "self",
"summary": "Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway Denial of Service Vulnerability",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-alg-dos-hbBS7SZE"
},
{
"category": "external",
"summary": "Cisco Event Response: March 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication",
"url": "https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74408"
},
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{
"category": "external",
"summary": "Cisco\u0026nbsp;IOS XE 3S Release Notes",
"url": "https://www.cisco.com/c/en/us/td/docs/ios/ios_xe/3/release/notes/asr1k_rn_3s_rel_notes/asr1k_rn_3s_sys_req.html#wp3069754"
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{
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"summary": "Cisco\u0026nbsp;IOS XE 3SG Release Notes",
"url": "https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/release/note/OL_24726.html#pgfId-2570252"
}
],
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"name": "16.11.2",
"product_id": "CSAFPID-261240"
}
},
{
"category": "service_pack",
"name": "16.11.1s",
"product": {
"name": "16.11.1s",
"product_id": "CSAFPID-261465"
}
},
{
"category": "service_pack",
"name": "16.11.1c",
"product": {
"name": "16.11.1c",
"product_id": "CSAFPID-264096"
}
}
],
"category": "product_version",
"name": "16.11"
},
{
"branches": [
{
"category": "service_pack",
"name": "16.12.1",
"product": {
"name": "16.12.1",
"product_id": "CSAFPID-227920"
}
},
{
"category": "service_pack",
"name": "16.12.1s",
"product": {
"name": "16.12.1s",
"product_id": "CSAFPID-265735"
}
},
{
"category": "service_pack",
"name": "16.12.1a",
"product": {
"name": "16.12.1a",
"product_id": "CSAFPID-265841"
}
},
{
"category": "service_pack",
"name": "16.12.1c",
"product": {
"name": "16.12.1c",
"product_id": "CSAFPID-267110"
}
},
{
"category": "service_pack",
"name": "16.12.1w",
"product": {
"name": "16.12.1w",
"product_id": "CSAFPID-267240"
}
},
{
"category": "service_pack",
"name": "16.12.2",
"product": {
"name": "16.12.2",
"product_id": "CSAFPID-267605"
}
},
{
"category": "service_pack",
"name": "16.12.1y",
"product": {
"name": "16.12.1y",
"product_id": "CSAFPID-271938"
}
},
{
"category": "service_pack",
"name": "16.12.2a",
"product": {
"name": "16.12.2a",
"product_id": "CSAFPID-272047"
}
},
{
"category": "service_pack",
"name": "16.12.3",
"product": {
"name": "16.12.3",
"product_id": "CSAFPID-273445"
}
},
{
"category": "service_pack",
"name": "16.12.2s",
"product": {
"name": "16.12.2s",
"product_id": "CSAFPID-273509"
}
},
{
"category": "service_pack",
"name": "16.12.1x",
"product": {
"name": "16.12.1x",
"product_id": "CSAFPID-273649"
}
},
{
"category": "service_pack",
"name": "16.12.1t",
"product": {
"name": "16.12.1t",
"product_id": "CSAFPID-274832"
}
},
{
"category": "service_pack",
"name": "16.12.2t",
"product": {
"name": "16.12.2t",
"product_id": "CSAFPID-275538"
}
},
{
"category": "service_pack",
"name": "16.12.4",
"product": {
"name": "16.12.4",
"product_id": "CSAFPID-277147"
}
},
{
"category": "service_pack",
"name": "16.12.3s",
"product": {
"name": "16.12.3s",
"product_id": "CSAFPID-277255"
}
},
{
"category": "service_pack",
"name": "16.12.1z",
"product": {
"name": "16.12.1z",
"product_id": "CSAFPID-277256"
}
},
{
"category": "service_pack",
"name": "16.12.3a",
"product": {
"name": "16.12.3a",
"product_id": "CSAFPID-277321"
}
},
{
"category": "service_pack",
"name": "16.12.4a",
"product": {
"name": "16.12.4a",
"product_id": "CSAFPID-278881"
}
},
{
"category": "service_pack",
"name": "16.12.1z1",
"product": {
"name": "16.12.1z1",
"product_id": "CSAFPID-281320"
}
}
],
"category": "product_version",
"name": "16.12"
},
{
"branches": [
{
"category": "service_pack",
"name": "17.1.1",
"product": {
"name": "17.1.1",
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}
},
{
"category": "service_pack",
"name": "17.1.1a",
"product": {
"name": "17.1.1a",
"product_id": "CSAFPID-272932"
}
},
{
"category": "service_pack",
"name": "17.1.1s",
"product": {
"name": "17.1.1s",
"product_id": "CSAFPID-274818"
}
},
{
"category": "service_pack",
"name": "17.1.2",
"product": {
"name": "17.1.2",
"product_id": "CSAFPID-277338"
}
},
{
"category": "service_pack",
"name": "17.1.1t",
"product": {
"name": "17.1.1t",
"product_id": "CSAFPID-277348"
}
}
],
"category": "product_version",
"name": "17.1"
},
{
"branches": [
{
"category": "service_pack",
"name": "17.2.1",
"product": {
"name": "17.2.1",
"product_id": "CSAFPID-251225"
}
},
{
"category": "service_pack",
"name": "17.2.1r",
"product": {
"name": "17.2.1r",
"product_id": "CSAFPID-277194"
}
},
{
"category": "service_pack",
"name": "17.2.1a",
"product": {
"name": "17.2.1a",
"product_id": "CSAFPID-277343"
}
},
{
"category": "service_pack",
"name": "17.2.1v",
"product": {
"name": "17.2.1v",
"product_id": "CSAFPID-278002"
}
},
{
"category": "service_pack",
"name": "17.2.2",
"product": {
"name": "17.2.2",
"product_id": "CSAFPID-278504"
}
}
],
"category": "product_version",
"name": "17.2"
},
{
"branches": [
{
"category": "service_pack",
"name": "17.3.1",
"product": {
"name": "17.3.1",
"product_id": "CSAFPID-254712"
}
},
{
"category": "service_pack",
"name": "17.3.1a",
"product": {
"name": "17.3.1a",
"product_id": "CSAFPID-279338"
}
},
{
"category": "service_pack",
"name": "17.3.1w",
"product": {
"name": "17.3.1w",
"product_id": "CSAFPID-279339"
}
}
],
"category": "product_version",
"name": "17.3"
}
],
"category": "product_family",
"name": "Cisco IOS XE Software"
}
],
"category": "vendor",
"name": "Cisco"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2021-1446",
"ids": [
{
"system_name": "Cisco Bug ID",
"text": "CSCvv65113"
}
],
"notes": [
{
"category": "other",
"text": "Complete.",
"title": "Affected Product Comprehensiveness"
}
],
"product_status": {
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"CSAFPID-184481",
"CSAFPID-194730",
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"CSAFPID-212408",
"CSAFPID-212411",
"CSAFPID-212412",
"CSAFPID-212436",
"CSAFPID-213100",
"CSAFPID-213469",
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"CSAFPID-213473",
"CSAFPID-213474",
"CSAFPID-213475",
"CSAFPID-213476",
"CSAFPID-213477",
"CSAFPID-213478",
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"CSAFPID-217262",
"CSAFPID-217263",
"CSAFPID-217264",
"CSAFPID-217265",
"CSAFPID-217266",
"CSAFPID-217267",
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"CSAFPID-217270",
"CSAFPID-217271",
"CSAFPID-217272",
"CSAFPID-217273",
"CSAFPID-217276",
"CSAFPID-218901",
"CSAFPID-218903",
"CSAFPID-218905",
"CSAFPID-220517",
"CSAFPID-220687",
"CSAFPID-220688",
"CSAFPID-220802",
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"CSAFPID-222257",
"CSAFPID-222693",
"CSAFPID-222694",
"CSAFPID-222711",
"CSAFPID-222925",
"CSAFPID-222942",
"CSAFPID-223018",
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"CSAFPID-273509",
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"CSAFPID-273649",
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"CSAFPID-274832",
"CSAFPID-275538",
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"CSAFPID-277255",
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"CSAFPID-277343",
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"CSAFPID-278881",
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"CSAFPID-279339",
"CSAFPID-281320"
]
},
"release_date": "2021-03-24T16:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "Cisco has released software updates that address this vulnerability.",
"product_ids": [
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"CSAFPID-184481",
"CSAFPID-194730",
"CSAFPID-194731",
"CSAFPID-194732",
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"CSAFPID-194736",
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"title": "Cisco IOS XE Software Network Address Translation Denial of Service Vulnerability"
}
]
}
ghsa-m3m6-h5x2-mhf5
Vulnerability from github
Published
2022-05-24 17:45
Modified
2022-05-24 17:45
Details
A vulnerability in the DNS application layer gateway (ALG) functionality used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a logic error that occurs when an affected device inspects certain DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through an affected device that is performing NAT for DNS packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device. The vulnerability can be exploited only by traffic that is sent through an affected device via IPv4 packets. The vulnerability cannot be exploited via IPv6 traffic.
{
"affected": [],
"aliases": [
"CVE-2021-1446"
],
"database_specific": {
"cwe_ids": [
"CWE-754"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2021-03-24T20:15:00Z",
"severity": "HIGH"
},
"details": "A vulnerability in the DNS application layer gateway (ALG) functionality used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a logic error that occurs when an affected device inspects certain DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through an affected device that is performing NAT for DNS packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device. The vulnerability can be exploited only by traffic that is sent through an affected device via IPv4 packets. The vulnerability cannot be exploited via IPv6 traffic.",
"id": "GHSA-m3m6-h5x2-mhf5",
"modified": "2022-05-24T17:45:15Z",
"published": "2022-05-24T17:45:15Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-1446"
},
{
"type": "WEB",
"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-alg-dos-hbBS7SZE"
}
],
"schema_version": "1.4.0",
"severity": []
}
var-202103-0768
Vulnerability from variot
A vulnerability in the DNS application layer gateway (ALG) functionality used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a logic error that occurs when an affected device inspects certain DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through an affected device that is performing NAT for DNS packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device. The vulnerability can be exploited only by traffic that is sent through an affected device via IPv4 packets. The vulnerability cannot be exploited via IPv6 traffic. Cisco IOS XE Exists in an exceptional condition check vulnerability.Service operation interruption (DoS) It may be in a state. Cisco IOS XE Software is an operating system of Cisco (Cisco). A single operating system for enterprise wired and wireless access, aggregation, core, and WAN, Cisco IOS XE reduces business and network complexity
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- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
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