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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTlqaG0tOG04Yy1jM2Y0
SSRF in Sydent due to missing validation of hostnames
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].
Permalink: https://github.com/advisories/GHSA-9jhm-8m8c-c3f4JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTlqaG0tOG04Yy1jM2Y0
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 3 years ago
Updated: over 1 year ago
CVSS Score: 7.7
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Identifiers: GHSA-9jhm-8m8c-c3f4, CVE-2021-29431
References:
- https://github.com/matrix-org/sydent/security/advisories/GHSA-9jhm-8m8c-c3f4
- https://pypi.org/project/matrix-sydent/
- 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/releases/tag/v2.3.0
- https://github.com/advisories/GHSA-9jhm-8m8c-c3f4
Blast Radius: 0.0
Affected Packages
pypi:matrix-sydent
Dependent packages: 0Dependent repositories: 1
Downloads: 231 last month
Affected Version Ranges: < 2.3.0
Fixed in: 2.3.0
All affected versions: 2.0.0, 2.0.1, 2.1.0, 2.2.0
All unaffected versions: 2.3.0, 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.4.4, 2.4.5, 2.4.6, 2.5.0, 2.5.1, 2.5.2, 2.5.3, 2.5.4, 2.5.5, 2.5.6, 2.6.0, 2.6.1