CVE-2022-39200

Summary

Dendrite is a Matrix homeserver written in Go. In affected versions events retrieved from a remote homeserver using the /get_missing_events path did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this endpoint. Note that this does not apply to events retrieved through other endpoints (e.g. /event, /state) as they have been correctly verified. Homeservers that have federation disabled are not vulnerable. The problem has been fixed in Dendrite 0.9.8. Users are advised to upgrade. There are no known workarounds for this issue.

Affected Software

Weaknesses

• CWE-347: CWE-347: Improper Verification of Cryptographic Signature

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/matrix-org/dendrite/security/advisories/GHSA-pfw4-xjgm-267c
• https://github.com/matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://github.com/matrix-org/dendrite/security/advisories/GHSA-pfw4-xjgm-267c
• https://github.com/matrix-org/dendrite/commit/2792d0490f3771488bad346981b8c26479a872c3

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