Cisco Security Advisory
Cisco IOS XR Software iPXE Boot Signature Bypass Vulnerability
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CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
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A vulnerability in the iPXE boot function of Cisco IOS XR software could allow an authenticated, local attacker to install an unverified software image on an affected device.
This vulnerability is due to insufficient image verification. An attacker could exploit this vulnerability by manipulating the boot parameters for image verification during the iPXE boot process on an affected device. A successful exploit could allow the attacker to boot an unverified software image on the 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-iosxr-ipxe-sigbypass-pymfyqgBThis advisory is part of the September 2023 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 2023 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication.
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Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco products if they were running a vulnerable release of Cisco IOS XR Software:
- 8000 Series Routers
- ASR 9000 Series Aggregation Services Routers
- Network Convergence System (NCS) 540 Series Routers
- NCS 560 Series Routers
- NCS 1000 Series
- NCS 4000 Series
- NCS 5000 Series
- NCS 5500 Series
- NCS 5700 Series
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
- 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
At the time of publication, the release information in the following tables was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
In the following table, the left column lists Cisco devices that are affected by the vulnerability described in this advisory, and the right column indicates which release included the fix for this vulnerability.
Cisco Platform First Fixed Release 8000 Series Routers 7.10.1 ASR 9000 Series Lightspeed-based line cards 24.1.1 ASR 9000 Series Tomahawk-based line cards None planned NCS 560 24.2.1 NCS 1001 None planned NCS 1002 None planned NCS 1004 24.1.1 NCS 4000 None planned NCS 5500 7.10.1 NCS 5700 7.10.1
Cisco has not released SMUs to address these vulnerabilities.
The 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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This vulnerability was found during internal security testing.
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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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Show LessVersion Description Section Status Date 2.1 Updated the Fixed Releases section. Fixed Releases Final 2024-MAR-14 2.0 Added a fixed release table with information about devices that are affected by this vulnerability. Fixed Releases Final 2024-MAR-13 1.0 Initial public release. - Final 2023-SEP-13
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