SB2023091421 - Time-of-check Time-of-use (TOCTOU) Race Condition in Cisco IOS XR Software
Published: September 14, 2023
Security Bulletin ID
SB2023091421
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2023-20135)
The vulnerability allows a local user to execute arbitrary code on the system.
The vulnerability exists 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. A local administrator can execute arbitrary code on target system.
Remediation
Install update from vendor's website.