GHSA-grvv-h2f9-7v9c
Dashboard / Vulnerabilities / GHSA-grvv-h2f9-7v9c
Summary: gomatrixserverlib and Dendrite vulnerable to incorrect parsing of the event default power level in event auth
Details: ### 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]](mailto:[email protected]).
References: 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://github.com/matrix-org/gomatrixserverlib, https://matrix.org/docs/guides/moderation/#power-levels, https://pkg.go.dev/vuln/GO-2022-0952
Affected packages
Package
Name: github.com/matrix-org/dendrite
Purl: pkg:golang/github.com/matrix-org/dendrite
Affected ranges
Type: SEMVER
Events:
