GHSA-grvv-h2f9-7v9cMediumCVSS 5.0
gomatrixserverlib and Dendrite vulnerable to incorrect parsing of the event default power level in event auth
🔗 CVE IDs covered (1)
📋 Description
Impact
The power level parsing within gomatrixserverlib was failing to parse the "events_default" key of the m.room.power_levels event, defaulting the event default power level to zero in all cases.
In rooms where the "events_default" power level had been changed, this could result in events either being incorrectly authorised or rejected by Dendrite servers.
Patches
gomatrixserverlib contains a fix as of commit 723fd49 and Dendrite 0.9.3 has been updated accordingly.
Workarounds
Matrix rooms where the "events_default" power level has not been changed from the default of zero are not vulnerable.
For more information
If you have any questions or comments about this advisory, e-mail us at [email protected].
🎯 Affected products2
- go/github.com/matrix-org/dendrite:< 0.9.3
- go/github.com/matrix-org/gomatrixserverlib:< 0.0.0-20220815091947-723fd495dde8
🔗 References (6)
- https://github.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-grvv-h2f9-7v9c
- https://nvd.nist.gov/vuln/detail/CVE-2022-36009
- https://github.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575
- https://matrix.org/docs/guides/moderation/#power-levels
- https://pkg.go.dev/vuln/GO-2022-0952
- https://github.com/advisories/GHSA-grvv-h2f9-7v9c