CVE-2022-36009: Incorrect parsing of access level in gomatrixserverlib and dendrite
First published: Fri Aug 19 2022(Updated: )
gomatrixserverlib 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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Matrix Dendrite | <=0.9.2 | |
| Matrix Gomatrixserverlib |
Remedy
https://github.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575
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Reference Links
Frequently Asked Questions
What is CVE-2022-36009?
CVE-2022-36009 is a vulnerability in gomatrixserverlib, a Go library for matrix protocol federation, and Dendrite, a Matrix homeserver.
What is the severity of CVE-2022-36009?
CVE-2022-36009 has a severity keyword of 'high' and a severity value of 8.8.
How does CVE-2022-36009 affect Matrix Dendrite?
CVE-2022-36009 affects Matrix Dendrite versions up to and including 0.9.2.
How does CVE-2022-36009 affect Matrix Gomatrixserverlib?
CVE-2022-36009 affects all versions of Matrix Gomatrixserverlib.
How can I fix CVE-2022-36009?
To fix CVE-2022-36009, update to a version of gomatrixserverlib or Dendrite that includes the fix.
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