CVE-2021-29431

Summary

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.

Affected Software

Weaknesses

• CWE-20: {"CWE-20":"Improper Input Validation"}
• CWE-918: CWE-918 Server-Side Request Forgery (SSRF)

ADP Enrichment

CVE Program Container

Additional References

• https://pypi.org/project/matrix-sydent/
• https://github.com/matrix-org/sydent/releases/tag/v2.3.0
• https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4
• https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f
• https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a
• https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3
• https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a

References

• https://pypi.org/project/matrix-sydent/
• https://github.com/matrix-org/sydent/releases/tag/v2.3.0
• https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4
• https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f
• https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a
• https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3
• https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a

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