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Cisco IOS XR Software iPXE Boot Signature Bypass (cisco-sa-iosxr-ipxe-sigbypass-pymfyqgB)

high Nessus Plugin ID 183213

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco IOS XR is affected by a vulnerability.

 - 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. (CVE-2023-20236)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvz63918, CSCvz63925, CSCvz63929, CSCwe12502

See Also

http://www.nessus.org/u?e01dceae

http://www.nessus.org/u?6a0abd7f

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz63918

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz63925

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz63929

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwe12502

Plugin Details

Severity: High

ID: 183213

File Name: cisco-sa-iosxr-ipxe-sigbypass-pymfyqgB-iosxr.nasl

Version: 1.2

Type: combined

Family: CISCO

Published: 10/17/2023

Updated: 3/15/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2023-20236

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ios_xr

Required KB Items: Host/Cisco/IOS-XR/Version, Host/Cisco/IOS-XR/Model

Exploit Ease: No known exploits are available

Patch Publication Date: 9/13/2023

Vulnerability Publication Date: 9/13/2023

Reference Information

CVE: CVE-2023-20236