PostScript file access via module policy bypass
Published Sep 13, 2021 · Updated Aug 4, 2024
Security policy bypass in ImageMagick before 6.9.12-22 and 7.0.0 through 7.1.0-6 allows local users to read or write PostScript files. OpenModule and RegisterStaticModules used incorrect or missing IsRightsAuthorized checks, so a denied PostScript module could still register. Exploitation requires local access and a policy.xml module rule denying PostScript; the bypass defeats that configured read-and-write restriction.
Summary
What happened
Security policy bypass in ImageMagick before 6.9.12-22 and 7.0.0 through 7.1.0-6 allows local users to read or write PostScript files. OpenModule and RegisterStaticModules used incorrect or missing IsRightsAuthorized checks, so a denied PostScript module could still register. Exploitation requires local access and a policy.xml module rule denying PostScript; the bypass defeats that configured read-and-write restriction.
The record
- CVE
- CVE-2021-39212
- Published
- Sep 13, 2021
- Updated
- Aug 4, 2024
- Vendor
- ImageMagick Studio LLC
- Product
- ImageMagick
- Classifications
- CWE-362, CWE-668
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 13, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 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=< 6.9.12-22
- Affected versionversion=>= 7.0.0, < 7.1.0-7
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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