QID 981367

QID 981367: Python (pip) Security Update for matrix-synapse (GHSA-5wrh-4jwv-5w78)

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 transitional IPv6 addresses were used. Outbound requests to federation, identity servers, when calculating the key validity for third-party invite events, sending push notifications, and generating URL previews are affected. This could cause Synapse to make requests to internal infrastructure on dual-stack networks.

  • CVSS V3 rated as High - 6.3 severity.
  • CVSS V2 rated as Medium - 4.9 severity.
    • Solution
    This issue is fixed by #9240.Workaround:
    Outbound requests to the following address ranges can be blocked by a firewall, if unused for internal communication between systems:

    * `::ffff/80`
    * `::0000/80` (note that this IP range is considered deprecated by the IETF)
    * `2002::/16` (note that this IP range is considered deprecated by the IETF)
    Vendor References

    CVEs related to QID 981367

    CVE-2021-21392 |
    Software Advisories
    Advisory ID Software Component Link
    GHSA-5wrh-4jwv-5w78 matrix-synapse URL Logo github.com/advisories/GHSA-5wrh-4jwv-5w78
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