cisco-sa-20190925-cat4000-tcp-dos
Vulnerability from csaf_cisco
Published
2019-09-25 16:00
Modified
2019-09-25 16:00
Summary
Cisco Catalyst 4000 Series Switches TCP Denial of Service Vulnerability
Notes
Summary
A vulnerability in the ingress packet processing function of Cisco IOS Software for Cisco Catalyst 4000 Series Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
The vulnerability is due to improper resource allocation when processing TCP packets directed to the device on specific Cisco Catalyst 4000 Series Switches. An attacker could exploit this vulnerability by sending crafted TCP streams to an affected device. A successful exploit could cause the affected device to run out of buffer resources, impairing operations of control plane and management plane protocols, resulting in a DoS condition.
This vulnerability can be triggered only by traffic that is destined to an affected device and cannot be exploited using traffic that transits an affected device.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-cat4000-tcp-dos ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-cat4000-tcp-dos"]
This advisory is part of the September 25, 2019, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes 12 Cisco Security Advisories that describe 13 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: September 2019 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-72547"].
Vulnerable Products
This vulnerability affects the following Cisco devices if they are running a vulnerable release of Cisco IOS Software:
Cisco Catalyst 4500 Supervisor Engine 6-E
Cisco Catalyst 4500 Supervisor Engine 6L-E
Cisco Catalyst 4900M Switch
Cisco Catalyst 4948E Ethernet Switch
Cisco Catalyst 4948E-F Ethernet Switch
For information about which Cisco IOS Software releases were vulnerable at the time of publication, see the Fixed Software ["#fs"] section of this advisory.
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 Cisco IOS XE Software, Cisco IOS XR Software, or Cisco NX-OS Software.
Details
Exploitation of this vulnerability may lead to exhaustion of buffer resources on an affected device, which in turn may prevent the device from accepting and processing unicast IP packets destined for the device. This may cause management protocols and control plane protocols relying on unicast IP traffic, including the BGP routing protocol, to stop working properly on the affected device, resulting in a DoS condition.
This vulnerability can be exploited using crafted TCP streams over either IPv4 or IPv6. This vulnerability can be triggered only by TCP traffic that is destined to an affected device and cannot be exploited using traffic that transits an affected device.
To exploit this vulnerability, an attacker must establish TCP connections to an open TCP port on the affected device. As a consequence, an attack cannot be performed using spoofed IP addresses.
Workarounds
There are no workarounds that address this vulnerability.
Use of infrastructure access control lists (iACLs) and vty ACLs as recommended in the Cisco Guide to Harden Cisco IOS Devices ["https://www.cisco.com/c/en/us/support/docs/ip/access-lists/13608-21.html"] can help reduce the attack surface by allowing access only from explicitly trusted source IP addresses.
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 and Alerts 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 Software
To help customers determine their exposure to vulnerabilities in Cisco IOS Software, Cisco provides a tool, the Cisco IOS Software Checker ["https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"], that identifies any Cisco Security Advisories that impact a specific Cisco IOS 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 this tool to perform the following tasks:
Initiate a search by choosing one or more releases from a drop-down list or uploading a file from a local system for the tool to parse
Enter the output of the show version command for the tool to parse
Create a custom search by including all previously published Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication
To determine whether a release is affected by any published Cisco Security Advisory, use the Cisco IOS Software Checker ["https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"] on Cisco.com or enter a Cisco IOS Software release—for example, 15.1(4)M2—in the following field:
By default, the Cisco IOS Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, use the Cisco IOS Software Checker on Cisco.com and check the Medium check box in the Impact Rating drop-down list.
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
Cisco would like to thank Tim April, Trevers Astheimer, Aaron Block, John-Nicholas Furst, and Eric Kloster of Akamai for reporting this vulnerability.
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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"text": "A vulnerability in the ingress packet processing function of Cisco IOS Software for Cisco Catalyst 4000 Series Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThe vulnerability is due to improper resource allocation when processing TCP packets directed to the device on specific Cisco Catalyst 4000 Series Switches. An attacker could exploit this vulnerability by sending crafted TCP streams to an affected device. A successful exploit could cause the affected device to run out of buffer resources, impairing operations of control plane and management plane protocols, resulting in a DoS condition.\r\n\r\nThis vulnerability can be triggered only by traffic that is destined to an affected device and cannot be exploited using traffic that transits an affected device.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\nThis advisory is available at the following link:\r\nhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-cat4000-tcp-dos [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-cat4000-tcp-dos\"]\r\n\r\nThis advisory is part of the September 25, 2019, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes 12 Cisco Security Advisories that describe 13 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: September 2019 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-72547\"].",
"title": "Summary"
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"text": "This vulnerability affects the following Cisco devices if they are running a vulnerable release of Cisco IOS Software:\r\n\r\nCisco Catalyst 4500 Supervisor Engine 6-E\r\nCisco Catalyst 4500 Supervisor Engine 6L-E\r\nCisco Catalyst 4900M Switch\r\nCisco Catalyst 4948E Ethernet Switch\r\nCisco Catalyst 4948E-F Ethernet Switch\r\n\r\nFor information about which Cisco IOS Software releases were vulnerable at the time of publication, see the Fixed Software [\"#fs\"] section of this advisory.",
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"text": "Only products listed in the Vulnerable Products [\"#vp\"] section of this advisory are known to be affected by this vulnerability.\r\n\r\nCisco has confirmed that this vulnerability does not affect Cisco IOS XE Software, Cisco IOS XR Software, or Cisco NX-OS Software.",
"title": "Products Confirmed Not Vulnerable"
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"text": "Exploitation of this vulnerability may lead to exhaustion of buffer resources on an affected device, which in turn may prevent the device from accepting and processing unicast IP packets destined for the device. This may cause management protocols and control plane protocols relying on unicast IP traffic, including the BGP routing protocol, to stop working properly on the affected device, resulting in a DoS condition.\r\n\r\nThis vulnerability can be exploited using crafted TCP streams over either IPv4 or IPv6. This vulnerability can be triggered only by TCP traffic that is destined to an affected device and cannot be exploited using traffic that transits an affected device.\r\n\r\nTo exploit this vulnerability, an attacker must establish TCP connections to an open TCP port on the affected device. As a consequence, an attack cannot be performed using spoofed IP addresses.",
"title": "Details"
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"text": "There are no workarounds that address this vulnerability.\r\n\r\nUse of infrastructure access control lists (iACLs) and vty ACLs as recommended in the Cisco Guide to Harden Cisco IOS Devices [\"https://www.cisco.com/c/en/us/support/docs/ip/access-lists/13608-21.html\"] can help reduce the attack surface by allowing access only from explicitly trusted source IP addresses.",
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"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 and Alerts 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:\r\nhttps://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 Software\r\nTo help customers determine their exposure to vulnerabilities in Cisco IOS Software, Cisco provides a tool, the Cisco IOS Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"], that identifies any Cisco Security Advisories that impact a specific Cisco IOS 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 this tool to perform the following tasks:\r\n\r\nInitiate a search by choosing one or more releases from a drop-down list or uploading a file from a local system for the tool to parse\r\nEnter the output of the show version command for the tool to parse\r\nCreate a custom search by including all previously published Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication\r\n\r\nTo determine whether a release is affected by any published Cisco Security Advisory, use the Cisco IOS Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"] on Cisco.com or enter a Cisco IOS Software release\u2014for example, 15.1(4)M2\u2014in the following field:\r\n\r\n\r\n\r\nBy default, the Cisco IOS Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, use the Cisco IOS Software Checker on Cisco.com and check the Medium check box in the Impact Rating drop-down list.",
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"category": "general",
"text": "Cisco would like to thank Tim April, Trevers Astheimer, Aaron Block, John-Nicholas Furst, and Eric Kloster of Akamai for reporting this vulnerability.",
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"contact_details": "Emergency Support:\r\n+1 877 228 7302 (toll-free within North America)\r\n+1 408 525 6532 (International direct-dial)\r\nNon-emergency Support:\r\nEmail: psirt@cisco.com\r\nSupport requests that are received via e-mail are typically acknowledged within 48 hours.",
"issuing_authority": "Cisco product security incident response is the responsibility of the Cisco Product Security Incident Response Team (PSIRT). The Cisco PSIRT is a dedicated, global team that manages the receipt, investigation, and public reporting of security vulnerability information that is related to Cisco products and networks. The on-call Cisco PSIRT works 24x7 with Cisco customers, independent security researchers, consultants, industry organizations, and other vendors to identify possible security issues with Cisco products and networks.\r\nMore information can be found in Cisco Security Vulnerability Policy available at https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html",
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"title": "Cisco Catalyst 4000 Series Switches TCP Denial of Service Vulnerability",
"tracking": {
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{
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{
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"name": "15.2(2)E3",
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},
{
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{
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},
{
"category": "service_pack",
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],
"category": "product_version",
"name": "15.2E"
},
{
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"name": "15.2(4)EA10",
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"category": "product_version",
"name": "15.2EA"
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{
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],
"category": "product_family",
"name": "IOS"
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],
"category": "vendor",
"name": "Cisco"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2019-12652",
"ids": [
{
"system_name": "Cisco Bug ID",
"text": "CSCvk66730"
}
],
"notes": [
{
"category": "other",
"text": "Complete.",
"title": "Affected Product Comprehensiveness"
}
],
"product_status": {
"known_affected": [
"CSAFPID-103955",
"CSAFPID-106072",
"CSAFPID-106089",
"CSAFPID-107094",
"CSAFPID-110186",
"CSAFPID-111005",
"CSAFPID-111384",
"CSAFPID-112141",
"CSAFPID-114093",
"CSAFPID-115477",
"CSAFPID-115688",
"CSAFPID-117196",
"CSAFPID-117871",
"CSAFPID-183811",
"CSAFPID-185281",
"CSAFPID-187057",
"CSAFPID-187233",
"CSAFPID-188035",
"CSAFPID-192163",
"CSAFPID-192910",
"CSAFPID-193283",
"CSAFPID-194741",
"CSAFPID-195469",
"CSAFPID-195489",
"CSAFPID-197465",
"CSAFPID-197481",
"CSAFPID-197483",
"CSAFPID-200488",
"CSAFPID-201074",
"CSAFPID-204102",
"CSAFPID-204108",
"CSAFPID-204186",
"CSAFPID-204187",
"CSAFPID-204228",
"CSAFPID-204831",
"CSAFPID-205672",
"CSAFPID-209030",
"CSAFPID-209031",
"CSAFPID-209034",
"CSAFPID-209046",
"CSAFPID-209358",
"CSAFPID-209887",
"CSAFPID-210766",
"CSAFPID-211296",
"CSAFPID-213610",
"CSAFPID-214078",
"CSAFPID-214992",
"CSAFPID-217805",
"CSAFPID-218891",
"CSAFPID-221033",
"CSAFPID-222436",
"CSAFPID-224553",
"CSAFPID-224868",
"CSAFPID-227959",
"CSAFPID-230587",
"CSAFPID-230594",
"CSAFPID-231471",
"CSAFPID-232765",
"CSAFPID-239053",
"CSAFPID-244911",
"CSAFPID-246497",
"CSAFPID-247572",
"CSAFPID-262335",
"CSAFPID-277353"
]
},
"release_date": "2019-09-25T16:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "Cisco has released software updates that address this vulnerability.",
"product_ids": [
"CSAFPID-103955",
"CSAFPID-106072",
"CSAFPID-106089",
"CSAFPID-107094",
"CSAFPID-110186",
"CSAFPID-111005",
"CSAFPID-111384",
"CSAFPID-112141",
"CSAFPID-114093",
"CSAFPID-115477",
"CSAFPID-115688",
"CSAFPID-117196",
"CSAFPID-117871",
"CSAFPID-183811",
"CSAFPID-185281",
"CSAFPID-187057",
"CSAFPID-187233",
"CSAFPID-188035",
"CSAFPID-192163",
"CSAFPID-192910",
"CSAFPID-193283",
"CSAFPID-194741",
"CSAFPID-195469",
"CSAFPID-195489",
"CSAFPID-197465",
"CSAFPID-197481",
"CSAFPID-197483",
"CSAFPID-200488",
"CSAFPID-201074",
"CSAFPID-204102",
"CSAFPID-204108",
"CSAFPID-204186",
"CSAFPID-204187",
"CSAFPID-204228",
"CSAFPID-204831",
"CSAFPID-205672",
"CSAFPID-209030",
"CSAFPID-209031",
"CSAFPID-209034",
"CSAFPID-209046",
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"CSAFPID-230587",
"CSAFPID-230594",
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"CSAFPID-232765",
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"CSAFPID-244911",
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"CSAFPID-247572",
"CSAFPID-262335",
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],
"url": "https://software.cisco.com"
}
],
"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-103955",
"CSAFPID-106072",
"CSAFPID-106089",
"CSAFPID-107094",
"CSAFPID-110186",
"CSAFPID-111005",
"CSAFPID-111384",
"CSAFPID-112141",
"CSAFPID-114093",
"CSAFPID-115477",
"CSAFPID-115688",
"CSAFPID-117196",
"CSAFPID-117871",
"CSAFPID-183811",
"CSAFPID-185281",
"CSAFPID-187057",
"CSAFPID-187233",
"CSAFPID-188035",
"CSAFPID-192163",
"CSAFPID-192910",
"CSAFPID-193283",
"CSAFPID-194741",
"CSAFPID-195469",
"CSAFPID-195489",
"CSAFPID-197465",
"CSAFPID-197481",
"CSAFPID-197483",
"CSAFPID-200488",
"CSAFPID-201074",
"CSAFPID-204102",
"CSAFPID-204108",
"CSAFPID-204186",
"CSAFPID-204187",
"CSAFPID-204228",
"CSAFPID-204831",
"CSAFPID-205672",
"CSAFPID-209030",
"CSAFPID-209031",
"CSAFPID-209034",
"CSAFPID-209046",
"CSAFPID-209358",
"CSAFPID-209887",
"CSAFPID-210766",
"CSAFPID-211296",
"CSAFPID-213610",
"CSAFPID-214078",
"CSAFPID-214992",
"CSAFPID-217805",
"CSAFPID-218891",
"CSAFPID-221033",
"CSAFPID-222436",
"CSAFPID-224553",
"CSAFPID-224868",
"CSAFPID-227959",
"CSAFPID-230587",
"CSAFPID-230594",
"CSAFPID-231471",
"CSAFPID-232765",
"CSAFPID-239053",
"CSAFPID-244911",
"CSAFPID-246497",
"CSAFPID-247572",
"CSAFPID-262335",
"CSAFPID-277353"
]
}
],
"title": "Cisco Catalyst 4000 Series Switches TCP Denial of Service Vulnerability"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- 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.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.