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.

Link	Resource
https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3	Patch Third Party Advisory
https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a	Patch Third Party Advisory
https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4	Patch Third Party Advisory
https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f	Patch Third Party Advisory
https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a	Patch Third Party Advisory
https://pypi.org/project/matrix-sydent/	Product Third Party Advisory
https://github.com/matrix-org/sydent/releases/tag/v2.3.0	Release Notes Third Party Advisory

Configuration 1

cpe:2.3:a:matrix:sydent:*:*:*:*:*:*:*:*

---

Published : 2021-04-15 09:15

Updated : 2021-04-22 03:27

---

NVD link : CVE-2021-29431

Mitre link : CVE-2021-29431

No products.

CWE-20

CWE-918

Server-Side Request Forgery (SSRF)