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CVE-2021-29431

CVE-2021-29431 · SSRF in Sydent due to missing validation of hostnames

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.7 · High · EPSS 1.2% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • sydent

    Versions
    • < 2.3.0: Affected

    No fix published

  • matrix-sydent PyPI

    Versions
    • 2.0.0
    • 2.0.1
    • 2.1.0
    • 2.2.0
    Affected ranges
    • ECOSYSTEM: < 2.3.0

    Update to 2.3.0

  • matrix-sydent PyPI

    Versions
    • 2.0.0
    • 2.0.1
    • 2.1.0
    • 2.2.0
    Affected ranges
    • {"events": [{"introduced": "0"}, {"fixed": "3d531ed50d2fd41ac387f36d44d3fb2c62dd22d3"}, {"fixed": "0f00412017f25619bc36c264b29ea96808bf310a"}, {"fixed": "9e573348d81df8191bbe8c266c01999c9d57cd5f"}, {"fixed": "8936925f561b0c352c2fa922d5097d7245aad00a"}], "repo": "https://github.com/matrix-org/sydent", "type": "GIT"}
    • ECOSYSTEM: < 2.3.0

    Update to 2.3.0

Original sources

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