QID 981374

QID 981374: Python (pip) Security Update for matrix-synapse (GHSA-v936-j8gp-9q3p)

Security update has been released for matrix-synapse to fix the vulnerability.

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Requests to user provided domains were not restricted to external IP addresses when calculating the key validity for third-party invite events and sending push notifications. This could cause Synapse to make requests to internal infrastructure. The type of request was not controlled by the user, although limited modification of request bodies was possible.

For the most thorough protection server administrators should remove the deprecated `federation_ip_range_blacklist` from their settings after upgrading to Synapse v1.25.0 which will result in Synapse using the improved default IP address restrictions. See the new `ip_range_blacklist` and `ip_range_whitelist` settings if more specific control is necessary.

  • CVSS V3 rated as High - 6.1 severity.
  • CVSS V2 rated as Medium - 5.8 severity.
    • Solution
    Issue is resolved by #8821. Further improvements to protect homeservers by default were made in #8870 and #8954.Workaround:
    Requests to internal IP addresses could be blocked at the system or network level.
    Vendor References

    CVEs related to QID 981374

    CVE-2021-21273 |
    Software Advisories
    Advisory ID Software Component Link
    GHSA-v936-j8gp-9q3p matrix-synapse URL Logo github.com/advisories/GHSA-v936-j8gp-9q3p
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