CVE-2023-20135

Summary

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.

Affected Software

VendorProductVersion RangeStatus
CiscoCisco IOS XR Software7.5.3affected
CiscoCisco IOS XR Software7.5.2affected
CiscoCisco IOS XR Software7.5.4affected
CiscoCisco IOS XR Software7.7.1affected
CiscoCisco IOS XR Software7.7.2affected
CiscoCisco IOS XR Software7.7.21affected
CiscoCisco IOS XR Software7.8.1affected
CiscoCisco IOS XR Software7.8.2affected
CiscoCisco IOS XR Software7.9.1affected
CiscoCisco IOS XR Software7.9.2affected

Weaknesses

  • CWE-347: Improper Verification of Cryptographic Signature

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References