GitHub Advisoryadvisory · PyPI
GHSA-9jhm-8m8c-c3f4 SSRF in Sydent due to missing validation of hostnames
MEDIUM
Official page ↗
- Aliases
- CVE-2021-29431
- Ecosystem
- PyPI
- Packages
- matrix-sydent
- Severity
- Moderate
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
- Weaknesses
- CWE-20, CWE-918
- Reviewed
- 2021-04-15
Affected packages
• PyPI matrix-sydent: < 2.3.0 → fixed in 2.3.0
Description
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].
Related
Alias · CVE (1)
- CVE-2021-29431 Sydent is a reference Matrix identity server. vulnerability
References
- https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4 web
- https://nvd.nist.gov/vuln/detail/CVE-2021-29431 advisory
- https://github.com/matrix-org/sydent/commit/0f00412017f25619bc36c264b29ea96808bf310a web
- https://github.com/matrix-org/sydent/commit/3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3 web
- https://github.com/matrix-org/sydent/commit/8936925f561b0c352c2fa922d5097d7245aad00a web
- https://github.com/matrix-org/sydent/commit/9e573348d81df8191bbe8c266c01999c9d57cd5f web
- https://github.com/matrix-org/sydent package
- https://github.com/matrix-org/sydent/releases/tag/v2.3.0 web
- https://github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-22.yaml web
- https://pypi.org/project/matrix-sydent web