Local security-policy bypass via omitted inode checks
Published Feb 19, 2020 · Updated Aug 6, 2024
Missing inode security checks in OverlayFS before Ubuntu linux 3.0.0-16.27 allow local users to bypass policy and access restricted files. The filesystem omits extended inode permission checks required by cgroups and Linux Security Modules when mediating file access. A local account and a reachable OverlayFS mount are required; the bypass exposes files that the enforced policy should deny.
Summary
What happened
Missing inode security checks in OverlayFS before Ubuntu linux 3.0.0-16.27 allow local users to bypass policy and access restricted files. The filesystem omits extended inode permission checks required by cgroups and Linux Security Modules when mediating file access. A local account and a reachable OverlayFS mount are required; the bypass exposes files that the enforced policy should deny.
The record
- CVE
- CVE-2012-0055
- Published
- Feb 19, 2020
- Updated
- Aug 6, 2024
- Vendor
- The Linux Kernel Organization
- Product
- OverlayFS
- Classifications
- T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 19, 2020CVE publishedPublication date reported by the CVE source.
- Aug 6, 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=as used in Ubuntu 10.0.4 LTS and 11.10
- Affected versionversion=before 3.0.0-16.28
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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