Vulnerability CVE-2021-29431
Published: 2021-04-15

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.

Type:

CWE-20

 (Improper Input Validation)

CVSS2 => (AV:N/AC:L/Au:S/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4/10
2.9/10
8/10
Exploit range
Attack complexity
Authentication
Remote
Low
Single time
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Matrix -> Sydent 

 References:
https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3
https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a
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://pypi.org/project/matrix-sydent/
https://github.com/matrix-org/sydent/releases/tag/v2.3.0
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