Cisco Security Advisory
Cisco IOS XR Software CLI Arbitrary File Read Vulnerability
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:X/RL:X/RC:X
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A vulnerability in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to read any file in the file system of the underlying Linux operating system. The attacker must have valid credentials on the affected device.
This vulnerability is due to incorrect validation of the arguments that are passed to a specific CLI command. An attacker could exploit this vulnerability by logging in to an affected device with low-privileged credentials and using the affected command. A successful exploit could allow the attacker access files in read-only mode on the Linux file 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-iosxr-shellutil-HCb278wDThis advisory is part of the September 2024 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2024 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication.
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Vulnerable Products
At the time of publication, this vulnerability affected Cisco IOS XR 64-Bit Software, regardless of device configuration.
For information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products 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 XE Software
- IOS XR 32-bit Software
- NX-OS Software
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There are no workarounds that address this vulnerability.
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When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page, 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.
Fixed Releases
In the following table, the left column lists Cisco software releases or trains. The right column indicates whether a release (train) is affected by the vulnerability that is described in this advisory and the first release that includes the fix for this vulnerability.
Cisco IOS XR Software Release First Fixed Release 7.10 and earlier Migrate to a fixed release. 7.11 7.11.2 24.1 24.1.2 24.2 Not affected. At the time of publication, Cisco had released the following SMUs to address this vulnerability. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information, including SMU availability. Customers who require SMUs for platforms or releases that are not listed are advised to contact their support organization.
Cisco IOS XR Software Release Platform SMU Name 7.3.2 ASR9K-X64
NCS540
NCS560
NCS5500asr9k-x64-7.3.2.CSCwk94350
ncs540-7.3.2.CSCwk94350
ncs560-7.3.2.CSCwk94350
ncs5500-7.3.2.CSCwk943507.5.2 8000 Series
ASR9K-X64
NCS540
NCS540L
NCS560
NCS55008000-7.5.2.CSCwk94350
asr9k-x64-7.5.2.CSCwk94350
ncs540-7.5.2.CSCwk94350
ncs540l-7.5.2.CSCwk94350
ncs560-7.5.2.CSCwk94350
ncs5500-7.5.2.CSCwk943507.7.2 8000 Series
ASR9K-X648000-7.7.2.CSCwk94350
asr9k-x64-7.7.2.CSCwk943507.8.2 ASR9K-X64
NCS540
NCS5500asr9k-x64-7.8.2.CSCwk94350
ncs540-7.8.2.CSCwk94350
ncs5500-7.8.2.CSCwk943507.9.2 8000 Series
ASR9K-X64
NCS55008000-7.9.2.CSCwk94350
asr9k-x64-7.9.2.CSCwk94350
ncs5500-7.9.2.CSCwk943507.9.21 ASR9K-X64 asr9k-x64-7.9.21.CSCwk94350 7.10.2 8000 Series
ASR9K-X64
NCS5608000-7.10.2.CSCwk94350
asr9k-x64-7.10.2.CSCwk94350
ncs560-7.10.2.CSCwk94350The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.
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The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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Cisco would like to thank Alberto Crosta of Bip Consulting for reporting this vulnerability.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Version Description Section Status Date 1.0 Initial public release. - Final 2024-SEP-11
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