PT-2023-5460 · Cisco · Cisco Ios Xr

Published 2023-09-13 · Updated 2024-01-25 · CVE-2023-20135

Positive Technologies (AI Summary)

CVSS v3.1

7.0

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Cisco IOS XR Software (affected versions not specified)

Description A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Race Condition

Time Of Check To Time Of Use

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-362

CWE-367

CWE-347

Related Identifiers

BDU:2023-06090

CVE-2023-20135

Affected Products

Cisco Ios Xr

References · 6

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-L9zOkBz5 · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-06090 · Security Note
• https://osv.dev/vulnerability/CVE-2023-20135 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-20135 · Security Note
• https://twitter.com/CVEnew/status/1702002500826702140 · Twitter Post
• https://t.me/cibsecurity/70400 · Telegram Post