QID 981365

QID 981365: Python (pip) Security Update for matrix-synapse (GHSA-w9fg-xffh-p362)

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.

Missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion.

  • CVSS V3 rated as High - 6.5 severity.
  • CVSS V2 rated as Medium - 4 severity.
    • Solution
    The issue is fixed by #9321.Workaround:
    Depending on the needs and configuration of the homeserver a few options are available:

    1. Using email as third-party identifiers be disabled by not configuring the `email` setting.
    2. Using phone numbers as third-party identifiers can be disabled by ensuring that `account_threepid_delegates.msisdn` is not configured.
    3. Additionally, the affected endpoint patterns can be blocked at a reverse proxy:

    * `^/_matrix/client/(r0|unstable)/register/email`
    * `^/_matrix/client/(r0|unstable)/register/msisdn`
    * `^/_matrix/client/(r0|unstable)/account/password`
    * `^/_matrix/client/(r0|unstable)/account/3pid`
    Vendor References

    CVEs related to QID 981365

    CVE-2021-21394 |
    Software Advisories
    Advisory ID Software Component Link
    GHSA-w9fg-xffh-p362 matrix-synapse URL Logo github.com/advisories/GHSA-w9fg-xffh-p362
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