Vulnerability Details CVE-2021-29431
Sydent is a reference Matrix identity server. Sydent can be induced to send HTTP GET requests to internal systems, due to lack of parameter validation or IP address blacklisting. It is not possible to exfiltrate data or control request headers, but it might be possible to use the attack to perform an internal port enumeration. This issue has been addressed in in 9e57334, 8936925, 3d531ed, 0f00412. A potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 53.3%
CVSS Severity
CVSS v3 Score 7.7
CVSS v2 Score 4.0
References
- https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a
- https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3
- https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a
- https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f
- https://github.com/matrix-org/sydent/releases/tag/v2.3.0
- https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4
- https://pypi.org/project/matrix-sydent/
- https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a
- https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3
- https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a
- https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f
- https://github.com/matrix-org/sydent/releases/tag/v2.3.0
- https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4
- https://pypi.org/project/matrix-sydent/
Products affected by CVE-2021-29431
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cpe:2.3:a:matrix:sydent:-
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cpe:2.3:a:matrix:sydent:1.0.0
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cpe:2.3:a:matrix:sydent:1.0.1
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cpe:2.3:a:matrix:sydent:1.0.2
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cpe:2.3:a:matrix:sydent:1.0.3
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cpe:2.3:a:matrix:sydent:2.0.0
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cpe:2.3:a:matrix:sydent:2.0.1
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cpe:2.3:a:matrix:sydent:2.1.0
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cpe:2.3:a:matrix:sydent:2.2.0