Moderate severityNVD Advisory· Published Apr 15, 2021· Updated Aug 3, 2024
SSRF in Sydent due to missing validation of hostnames
CVE-2021-29431
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
matrix-sydentPyPI | < 2.3.0 | 2.3.0 |
Affected products
2- Range: < 2.3.0
Patches
Vulnerability mechanics
References
11- github.com/advisories/GHSA-9jhm-8m8c-c3f4ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-29431ghsaADVISORY
- github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310aghsax_refsource_MISCWEB
- github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3ghsax_refsource_MISCWEB
- github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00aghsax_refsource_MISCWEB
- github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5fghsax_refsource_MISCWEB
- github.com/matrix-org/sydent/releases/tag/v2.3.0ghsax_refsource_MISCWEB
- github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4ghsax_refsource_CONFIRMWEB
- github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-22.yamlghsaWEB
- pypi.org/project/matrix-sydentghsaWEB
- pypi.org/project/matrix-sydent/mitrex_refsource_MISC
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