ImageMagick before 7.1.2-32 and 6.9.13-57 contains a policy bypass vulnerability in LoadPolicyCache that silently skips security policy rules when policy.xml uses an alternate DOCTYPE. A valid DOCTYPE not ending in ]> makes the parser consume the rest of the file, so no policy rules are applied and restricted operations become allowed.
Weakness
The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/1.html
- https://cwe.mitre.org/data/definitions/107.html
- https://cwe.mitre.org/data/definitions/127.html
- https://cwe.mitre.org/data/definitions/17.html
- https://cwe.mitre.org/data/definitions/20.html
- https://cwe.mitre.org/data/definitions/22.html
- https://cwe.mitre.org/data/definitions/237.html
- https://cwe.mitre.org/data/definitions/36.html
- https://cwe.mitre.org/data/definitions/477.html
- https://cwe.mitre.org/data/definitions/480.html
- https://cwe.mitre.org/data/definitions/51.html
- https://cwe.mitre.org/data/definitions/57.html
- https://cwe.mitre.org/data/definitions/59.html
- https://cwe.mitre.org/data/definitions/65.html
- https://cwe.mitre.org/data/definitions/668.html
- https://cwe.mitre.org/data/definitions/74.html
- https://cwe.mitre.org/data/definitions/87.html
References
- https://github.com/ImageMagick/ImageMagick
- https://github.com/ImageMagick/ImageMagick/blob/7.1.2-31/MagickCore/policy.c#L1138-L1145
- https://github.com/ImageMagick/ImageMagick/commit/1926ccf119141c26274c120d1899dffae19b0c71
- https://github.com/ImageMagick/ImageMagick/commit/399d4bd3b081f44c7fef78153f65e8cdebed9f1a
- https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-jjp4-3fwf-393j
- https://github.com/ImageMagick/ImageMagick6/commit/402ebc5353e569234908962cbdf451531ff66a57
- https://github.com/ImageMagick/ImageMagick6/commit/da6022b2efe6cce8a2fd8f9e51188a45a3b9d558
- https://www.vulncheck.com/advisories/imagemagick-before-7.1.2-32-and-6.9.13-57-security-policy-bypass-via-policy-xml-doctype