Controller file listing via symlink traversal
Published Nov 4, 2021 · Updated Aug 3, 2024
Path traversal in FilePath#listFiles in Jenkins 2.318 and earlier allows remote authenticated users to list controller files via symlinks. The method follows symbolic links and returns entries outside directories granted to the agent because it omits stat permission checks on each result. Exploitation requires control of a connected agent; the exposed consequence is controller file-name and path disclosure, not file-content access by this operation alone.
Summary
What happened
Path traversal in FilePath#listFiles in Jenkins 2.318 and earlier allows remote authenticated users to list controller files via symlinks. The method follows symbolic links and returns entries outside directories granted to the agent because it omits stat permission checks on each result. Exploitation requires control of a connected agent; the exposed consequence is controller file-name and path disclosure, not file-content access by this operation alone.
The record
- CVE
- CVE-2021-21695
- Published
- Nov 4, 2021
- Updated
- Aug 3, 2024
- Vendor
- Jenkins Project
- Product
- Jenkins
- Classifications
- CWE-59, T1083
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 4, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <=2.318
- Affected versionversion=unspecified <=LTS 2.303.2
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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