CVE-2022-36009

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Summary

CVECVE-2022-36009
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-08-19 21:15:00 UTC
Updated2022-08-24 23:55:00 UTC
Descriptiongomatrixserverlib is a Go library for matrix protocol federation. Dendrite is a Matrix homeserver written in Go, an alternative to Synapse. 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. Power levels are the matrix terminology for user access level. 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. gomatrixserverlib contains a fix as of commit `723fd49` and Dendrite 0.9.3 has been updated accordingly. Matrix rooms where the `"events_default"` power level has not been changed from the default of zero are not vulnerable. Users are advised to upgrade. There are no known workarounds for this issue.

Risk And Classification

Problem Types: CWE-863

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Matrix Dendrite All All All All
Application Matrix Gomatrixserverlib - All All All

References

ReferenceSourceLinkTags
Incorrect parsing of the event default power level in event auth · Advisory · matrix-org/gomatrixserverlib · GitHub CONFIRM github.com
Fix parsing of `"events_default"` level in `m.room.power_levels` events · matrix-org/gomatrixserverlib@723fd49 · GitHub MISC github.com
Moderation in Matrix | Matrix.org MISC matrix.org
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