SB2021022601 - Time-of-check Time-of-use (TOCTOU) Race Condition in jenkins (Alpine package)
Published: February 26, 2021
Security Bulletin ID
SB2021022601
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
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-2021-21615)
The vulnerability allows a remote user to gain access to sensitive information.
The vulnerability exists due to a race condition in the file browser for workspaces. A remote user with Job/Workspace permission and the ability to control workspace contents, e.g., with Job/Configure permission or the ability to change SCM contents, can create symbolic links that allow them to access files outside workspaces using the workspace browser.
Note, the vulnerability is caused by incorrect patch for #VU49527
Remediation
Install update from vendor's website.