cisco-sa-20180926-privesc
Vulnerability from csaf_cisco
Published
2018-09-26 16:00
Modified
2018-09-26 16:00
Summary
Cisco IOS XE Software Privileged EXEC Mode Root Shell Access Vulnerability
Notes
Summary
A vulnerability in the CLI parser of Cisco IOS XE Software could allow an authenticated, local attacker to gain access to the underlying Linux shell of an affected device and execute arbitrary commands with root privileges on the device.
The vulnerability is due to the affected software improperly sanitizing command arguments to prevent modifications to the underlying Linux filesystem on a device. An attacker who has privileged EXEC mode (privilege level 15) access to an affected device could exploit this vulnerability on the device by executing CLI commands that contain crafted arguments. A successful exploit could allow the attacker to gain access to the underlying Linux shell of the affected device and execute arbitrary commands with root privileges on the device.
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-20180926-privesc ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-privesc"]
Vulnerable Products
This vulnerability affects Cisco devices that are running a vulnerable release of Cisco IOS XE Software.
For information about which Cisco IOS XE Software releases are vulnerable, see the Fixed Software ["#fs"] section of this advisory.
Determining the Cisco IOS XE Software Release
To determine which Cisco IOS XE Software release is running on a device, administrators can log in to the device, use the show version command in the CLI, and then refer to the system banner that appears. If the device is running Cisco IOS XE Software, the system banner displays Cisco IOS Software, Cisco IOS XE Software, or similar text.
The following example shows the output of the command for a device that is running Cisco IOS XE Software Release 16.2.1 and has an installed image name of CAT3K_CAA-UNIVERSALK9-M:
ios-xe-device# show version
Cisco IOS Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version Denali 16.2.1, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2016 by Cisco Systems, Inc. Compiled Sun 27-Mar-16 21:47 by mcpre . . .
For information about the naming and numbering conventions for Cisco IOS XE Software releases, see the Cisco IOS and NX-OS Software Reference Guide ["https://www.cisco.com/c/en/us/about/security-center/ios-nx-os-reference-guide.html"].
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, 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.
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 CLI parser of Cisco IOS XE Software could allow an authenticated, local attacker to gain access to the underlying Linux shell of an affected device and execute arbitrary commands with root privileges on the device.\r\n\r\nThe vulnerability is due to the affected software improperly sanitizing command arguments to prevent modifications to the underlying Linux filesystem on a device. An attacker who has privileged EXEC mode (privilege level 15) access to an affected device could exploit this vulnerability on the device by executing CLI commands that contain crafted arguments. A successful exploit could allow the attacker to gain access to the underlying Linux shell of the affected device and execute arbitrary commands with root privileges on the device.\r\n\r\nThere 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-20180926-privesc [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-privesc\"]",
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{
"category": "service_pack",
"name": "3.14.1S",
"product": {
"name": "3.14.1S",
"product_id": "CSAFPID-206181"
}
},
{
"category": "service_pack",
"name": "3.14.2S",
"product": {
"name": "3.14.2S",
"product_id": "CSAFPID-206191"
}
},
{
"category": "service_pack",
"name": "3.14.3S",
"product": {
"name": "3.14.3S",
"product_id": "CSAFPID-206192"
}
},
{
"category": "service_pack",
"name": "3.14.4S",
"product": {
"name": "3.14.4S",
"product_id": "CSAFPID-206193"
}
}
],
"category": "product_version",
"name": "3.14S"
},
{
"branches": [
{
"category": "service_pack",
"name": "3.15.0S",
"product": {
"name": "3.15.0S",
"product_id": "CSAFPID-206180"
}
},
{
"category": "service_pack",
"name": "3.15.1S",
"product": {
"name": "3.15.1S",
"product_id": "CSAFPID-210079"
}
},
{
"category": "service_pack",
"name": "3.15.2S",
"product": {
"name": "3.15.2S",
"product_id": "CSAFPID-212268"
}
},
{
"category": "service_pack",
"name": "3.15.1cS",
"product": {
"name": "3.15.1cS",
"product_id": "CSAFPID-213700"
}
},
{
"category": "service_pack",
"name": "3.15.3S",
"product": {
"name": "3.15.3S",
"product_id": "CSAFPID-213776"
}
},
{
"category": "service_pack",
"name": "3.15.4S",
"product": {
"name": "3.15.4S",
"product_id": "CSAFPID-217264"
}
}
],
"category": "product_version",
"name": "3.15S"
},
{
"branches": [
{
"category": "service_pack",
"name": "3.16.0S",
"product": {
"name": "3.16.0S",
"product_id": "CSAFPID-210081"
}
},
{
"category": "service_pack",
"name": "3.16.1S",
"product": {
"name": "3.16.1S",
"product_id": "CSAFPID-212408"
}
},
{
"category": "service_pack",
"name": "3.16.0aS",
"product": {
"name": "3.16.0aS",
"product_id": "CSAFPID-213476"
}
},
{
"category": "service_pack",
"name": "3.16.1aS",
"product": {
"name": "3.16.1aS",
"product_id": "CSAFPID-213477"
}
},
{
"category": "service_pack",
"name": "3.16.0bS",
"product": {
"name": "3.16.0bS",
"product_id": "CSAFPID-213777"
}
},
{
"category": "service_pack",
"name": "3.16.0cS",
"product": {
"name": "3.16.0cS",
"product_id": "CSAFPID-213778"
}
}
],
"category": "product_version",
"name": "3.16S"
},
{
"branches": [
{
"category": "service_pack",
"name": "3.17.0S",
"product": {
"name": "3.17.0S",
"product_id": "CSAFPID-212411"
}
}
],
"category": "product_version",
"name": "3.17S"
}
],
"category": "product_family",
"name": "Cisco IOS XE Software"
}
],
"category": "vendor",
"name": "Cisco"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2018-15368",
"ids": [
{
"system_name": "Cisco Bug ID",
"text": "CSCuw45594"
}
],
"notes": [
{
"category": "other",
"text": "Complete.",
"title": "Affected Product Comprehensiveness"
}
],
"product_status": {
"known_affected": [
"CSAFPID-184480",
"CSAFPID-184481",
"CSAFPID-194730",
"CSAFPID-194731",
"CSAFPID-194732",
"CSAFPID-194735",
"CSAFPID-194736",
"CSAFPID-194737",
"CSAFPID-194842",
"CSAFPID-194843",
"CSAFPID-198123",
"CSAFPID-198124",
"CSAFPID-198125",
"CSAFPID-200768",
"CSAFPID-200770",
"CSAFPID-200771",
"CSAFPID-201495",
"CSAFPID-202539",
"CSAFPID-202540",
"CSAFPID-202541",
"CSAFPID-202542",
"CSAFPID-202558",
"CSAFPID-203353",
"CSAFPID-206159",
"CSAFPID-206160",
"CSAFPID-206161",
"CSAFPID-206162",
"CSAFPID-206174",
"CSAFPID-206175",
"CSAFPID-206176",
"CSAFPID-206178",
"CSAFPID-206180",
"CSAFPID-206181",
"CSAFPID-206188",
"CSAFPID-206189",
"CSAFPID-206190",
"CSAFPID-206191",
"CSAFPID-206192",
"CSAFPID-206193",
"CSAFPID-210078",
"CSAFPID-210079",
"CSAFPID-210081",
"CSAFPID-212268",
"CSAFPID-212408",
"CSAFPID-212411",
"CSAFPID-213470",
"CSAFPID-213471",
"CSAFPID-213473",
"CSAFPID-213474",
"CSAFPID-213475",
"CSAFPID-213476",
"CSAFPID-213477",
"CSAFPID-213580",
"CSAFPID-213661",
"CSAFPID-213700",
"CSAFPID-213776",
"CSAFPID-213777",
"CSAFPID-213778",
"CSAFPID-213781",
"CSAFPID-213798",
"CSAFPID-213799",
"CSAFPID-213816",
"CSAFPID-213825",
"CSAFPID-213955",
"CSAFPID-213957",
"CSAFPID-217264"
]
},
"release_date": "2018-09-26T16:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "Cisco has released software updates that address this vulnerability.",
"product_ids": [
"CSAFPID-184480",
"CSAFPID-184481",
"CSAFPID-194730",
"CSAFPID-194731",
"CSAFPID-194732",
"CSAFPID-194735",
"CSAFPID-194736",
"CSAFPID-194737",
"CSAFPID-194842",
"CSAFPID-194843",
"CSAFPID-198123",
"CSAFPID-198124",
"CSAFPID-198125",
"CSAFPID-200768",
"CSAFPID-200770",
"CSAFPID-200771",
"CSAFPID-201495",
"CSAFPID-202539",
"CSAFPID-202540",
"CSAFPID-202541",
"CSAFPID-202542",
"CSAFPID-202558",
"CSAFPID-203353",
"CSAFPID-206159",
"CSAFPID-206160",
"CSAFPID-206161",
"CSAFPID-206162",
"CSAFPID-206174",
"CSAFPID-206175",
"CSAFPID-206176",
"CSAFPID-206178",
"CSAFPID-206180",
"CSAFPID-206181",
"CSAFPID-206188",
"CSAFPID-206189",
"CSAFPID-206190",
"CSAFPID-206191",
"CSAFPID-206192",
"CSAFPID-206193",
"CSAFPID-210078",
"CSAFPID-210079",
"CSAFPID-210081",
"CSAFPID-212268",
"CSAFPID-212408",
"CSAFPID-212411",
"CSAFPID-213470",
"CSAFPID-213471",
"CSAFPID-213473",
"CSAFPID-213474",
"CSAFPID-213475",
"CSAFPID-213476",
"CSAFPID-213477",
"CSAFPID-213580",
"CSAFPID-213661",
"CSAFPID-213700",
"CSAFPID-213776",
"CSAFPID-213777",
"CSAFPID-213778",
"CSAFPID-213781",
"CSAFPID-213798",
"CSAFPID-213799",
"CSAFPID-213816",
"CSAFPID-213825",
"CSAFPID-213955",
"CSAFPID-213957",
"CSAFPID-217264"
],
"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-184480",
"CSAFPID-184481",
"CSAFPID-194730",
"CSAFPID-194731",
"CSAFPID-194732",
"CSAFPID-194735",
"CSAFPID-194736",
"CSAFPID-194737",
"CSAFPID-194842",
"CSAFPID-194843",
"CSAFPID-198123",
"CSAFPID-198124",
"CSAFPID-198125",
"CSAFPID-200768",
"CSAFPID-200770",
"CSAFPID-200771",
"CSAFPID-201495",
"CSAFPID-202539",
"CSAFPID-202540",
"CSAFPID-202541",
"CSAFPID-202542",
"CSAFPID-202558",
"CSAFPID-203353",
"CSAFPID-206159",
"CSAFPID-206160",
"CSAFPID-206161",
"CSAFPID-206162",
"CSAFPID-206174",
"CSAFPID-206175",
"CSAFPID-206176",
"CSAFPID-206178",
"CSAFPID-206180",
"CSAFPID-206181",
"CSAFPID-206188",
"CSAFPID-206189",
"CSAFPID-206190",
"CSAFPID-206191",
"CSAFPID-206192",
"CSAFPID-206193",
"CSAFPID-210078",
"CSAFPID-210079",
"CSAFPID-210081",
"CSAFPID-212268",
"CSAFPID-212408",
"CSAFPID-212411",
"CSAFPID-213470",
"CSAFPID-213471",
"CSAFPID-213473",
"CSAFPID-213474",
"CSAFPID-213475",
"CSAFPID-213476",
"CSAFPID-213477",
"CSAFPID-213580",
"CSAFPID-213661",
"CSAFPID-213700",
"CSAFPID-213776",
"CSAFPID-213777",
"CSAFPID-213778",
"CSAFPID-213781",
"CSAFPID-213798",
"CSAFPID-213799",
"CSAFPID-213816",
"CSAFPID-213825",
"CSAFPID-213955",
"CSAFPID-213957",
"CSAFPID-217264"
]
}
],
"title": "Cisco IOS XE Software Privileged EXEC Mode Root Shell Access 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.