cisco-sa-20190925-dt
Vulnerability from csaf_cisco
Published
2019-09-25 16:00
Modified
2019-09-25 16:00
Summary
Cisco IOS XE Software Path Traversal Vulnerability
Notes
Summary
A vulnerability in the Guest Shell of Cisco IOS XE Software could allow an authenticated, local attacker to perform directory traversal on the base Linux operating system of Cisco IOS XE Software.
The vulnerability is due to incomplete validation of certain commands. An attacker could exploit this vulnerability by first accessing the Guest Shell and then entering specific commands. A successful exploit could allow the attacker to execute arbitrary code on the base Linux operating system.
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-dt ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-dt"]
Vulnerable Products
At the time of publication, this vulnerability affected Cisco devices running a vulnerable release of Cisco IOS XE Software if it supported the Guest Shell feature. If the device accepts the CLI command guestshell, the device supports the Guest Shell. A device that does not accept the command will show an error message that contains Unknown command or computer name.
The Guest Shell was introduced in Cisco IOS XE Software Release 16.5.1. For more information about which Cisco IOS XE 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 Software, Cisco IOS XR Software, or Cisco NX-OS Software.
Workarounds
There are no workarounds that address this vulnerability.
Fixed Software
For detailed information about affected and fixed software releases, consult the Cisco IOS Software Checker.
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.
Cisco IOS and IOS XE Software
To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE 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 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 or IOS XE Software release—for example, 15.1(4)M2 or 3.13.8S—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.
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 internal security testing.
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 Guest Shell of Cisco IOS XE Software could allow an authenticated, local attacker to perform directory traversal on the base Linux operating system of Cisco IOS XE Software.\r\n\r\nThe vulnerability is due to incomplete validation of certain commands. An attacker could exploit this vulnerability by first accessing the Guest Shell and then entering specific commands. A successful exploit could allow the attacker to execute arbitrary code on the base Linux operating system.\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-dt [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-dt\"]",
"title": "Summary"
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"text": "At the time of publication, this vulnerability affected Cisco devices running a vulnerable release of Cisco IOS XE Software if it supported the Guest Shell feature. If the device accepts the CLI command guestshell, the device supports the Guest Shell. A device that does not accept the command will show an error message that contains Unknown command or computer name.\r\n\r\nThe Guest Shell was introduced in Cisco IOS XE Software Release 16.5.1. For more information about which Cisco IOS XE 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 Software, Cisco IOS XR Software, or Cisco NX-OS Software.",
"title": "Products Confirmed Not Vulnerable"
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"text": "For detailed information about affected and fixed software releases, consult the Cisco IOS Software Checker.\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 Cisco IOS and IOS XE Software\r\nTo help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE 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 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 or IOS XE Software release\u2014for example, 15.1(4)M2 or 3.13.8S\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.\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"
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{
"category": "general",
"text": "This vulnerability was found during internal security testing.",
"title": "Source"
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{
"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"
}
],
"publisher": {
"category": "vendor",
"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",
"name": "Cisco",
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"summary": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-dt",
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"tracking": {
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{
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],
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{
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},
{
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{
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{
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},
{
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},
{
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}
],
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{
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},
{
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},
{
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},
{
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},
{
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],
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},
{
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},
{
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},
{
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},
{
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"product": {
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"product_id": "CSAFPID-236834"
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},
{
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"product": {
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}
},
{
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"name": "16.8.1d",
"product": {
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"product_id": "CSAFPID-242834"
}
},
{
"category": "service_pack",
"name": "16.8.2",
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}
},
{
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}
}
],
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{
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"category": "service_pack",
"name": "16.9.1",
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"product_id": "CSAFPID-225856"
}
},
{
"category": "service_pack",
"name": "16.9.2",
"product": {
"name": "16.9.2",
"product_id": "CSAFPID-232008"
}
},
{
"category": "service_pack",
"name": "16.9.1a",
"product": {
"name": "16.9.1a",
"product_id": "CSAFPID-242308"
}
},
{
"category": "service_pack",
"name": "16.9.1b",
"product": {
"name": "16.9.1b",
"product_id": "CSAFPID-243362"
}
},
{
"category": "service_pack",
"name": "16.9.1s",
"product": {
"name": "16.9.1s",
"product_id": "CSAFPID-244530"
}
},
{
"category": "service_pack",
"name": "16.9.1c",
"product": {
"name": "16.9.1c",
"product_id": "CSAFPID-245375"
}
},
{
"category": "service_pack",
"name": "16.9.1d",
"product": {
"name": "16.9.1d",
"product_id": "CSAFPID-248242"
}
},
{
"category": "service_pack",
"name": "16.9.2a",
"product": {
"name": "16.9.2a",
"product_id": "CSAFPID-251166"
}
}
],
"category": "product_version",
"name": "16.9"
}
],
"category": "product_family",
"name": "Cisco IOS XE Software"
}
],
"category": "vendor",
"name": "Cisco"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2019-12666",
"ids": [
{
"system_name": "Cisco Bug ID",
"text": "CSCvm24705"
}
],
"notes": [
{
"category": "other",
"text": "Complete.",
"title": "Affected Product Comprehensiveness"
}
],
"product_status": {
"known_affected": [
"CSAFPID-214051",
"CSAFPID-217257",
"CSAFPID-217259",
"CSAFPID-218901",
"CSAFPID-218903",
"CSAFPID-218905",
"CSAFPID-225784",
"CSAFPID-225856",
"CSAFPID-226330",
"CSAFPID-228706",
"CSAFPID-229187",
"CSAFPID-231389",
"CSAFPID-231390",
"CSAFPID-231682",
"CSAFPID-232008",
"CSAFPID-232461",
"CSAFPID-232767",
"CSAFPID-233155",
"CSAFPID-235307",
"CSAFPID-235858",
"CSAFPID-236834",
"CSAFPID-236837",
"CSAFPID-237460",
"CSAFPID-242308",
"CSAFPID-242834",
"CSAFPID-243362",
"CSAFPID-244070",
"CSAFPID-244071",
"CSAFPID-244530",
"CSAFPID-244900",
"CSAFPID-245375",
"CSAFPID-247629",
"CSAFPID-248242",
"CSAFPID-249171",
"CSAFPID-251166"
]
},
"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-214051",
"CSAFPID-217257",
"CSAFPID-217259",
"CSAFPID-218901",
"CSAFPID-218903",
"CSAFPID-218905",
"CSAFPID-225784",
"CSAFPID-225856",
"CSAFPID-226330",
"CSAFPID-228706",
"CSAFPID-229187",
"CSAFPID-231389",
"CSAFPID-231390",
"CSAFPID-231682",
"CSAFPID-232008",
"CSAFPID-232461",
"CSAFPID-232767",
"CSAFPID-233155",
"CSAFPID-235307",
"CSAFPID-235858",
"CSAFPID-236834",
"CSAFPID-236837",
"CSAFPID-237460",
"CSAFPID-242308",
"CSAFPID-242834",
"CSAFPID-243362",
"CSAFPID-244070",
"CSAFPID-244071",
"CSAFPID-244530",
"CSAFPID-244900",
"CSAFPID-245375",
"CSAFPID-247629",
"CSAFPID-248242",
"CSAFPID-249171",
"CSAFPID-251166"
],
"url": "https://software.cisco.com"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 6.7,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"version": "3.0"
},
"products": [
"CSAFPID-214051",
"CSAFPID-217257",
"CSAFPID-217259",
"CSAFPID-218901",
"CSAFPID-218903",
"CSAFPID-218905",
"CSAFPID-225784",
"CSAFPID-225856",
"CSAFPID-226330",
"CSAFPID-228706",
"CSAFPID-229187",
"CSAFPID-231389",
"CSAFPID-231390",
"CSAFPID-231682",
"CSAFPID-232008",
"CSAFPID-232461",
"CSAFPID-232767",
"CSAFPID-233155",
"CSAFPID-235307",
"CSAFPID-235858",
"CSAFPID-236834",
"CSAFPID-236837",
"CSAFPID-237460",
"CSAFPID-242308",
"CSAFPID-242834",
"CSAFPID-243362",
"CSAFPID-244070",
"CSAFPID-244071",
"CSAFPID-244530",
"CSAFPID-244900",
"CSAFPID-245375",
"CSAFPID-247629",
"CSAFPID-248242",
"CSAFPID-249171",
"CSAFPID-251166"
]
}
],
"title": "Cisco IOS XE Software Path Traversal 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.