GHSA-9jhm-8m8c-c3f4
SSRF in Sydent due to missing validation of hostnames
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| PyPI | matrix-sydent | < 2.3.0 | 2.3.0 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
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.
### Patches
Fixed in 9e57334, 8936925, 3d531ed, 0f00412
### Workarounds
A potential workaround would be to use a firewall to ensure that Sydent cannot reach internal HTTP resources.
### For more information
If you have any questions or comments about this advisory, email us at [email protected].
References
External links from the advisory. They lead to third-party sites.
- https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4
- https://nvd.nist.gov/vuln/detail/CVE-2021-29431
- 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
- https://github.com/matrix-org/sydent/releases/tag/v2.3.0
- https://github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-22.yaml
- https://pypi.org/project/matrix-sydent