Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1ncnZ2LWgyZjktN3Y5Y84AAuiv

gomatrixserverlib and Dendrite vulnerable to incorrect parsing of the event default power level in event auth

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].

Permalink: https://github.com/advisories/GHSA-grvv-h2f9-7v9c
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1ncnZ2LWgyZjktN3Y5Y84AAuiv
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: over 1 year ago
Updated: about 1 year ago

CVSS Score: 5.0
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

Identifiers: GHSA-grvv-h2f9-7v9c, CVE-2022-36009
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://matrix.org/docs/guides/moderation/#power-levels
• https://pkg.go.dev/vuln/GO-2022-0952
• https://github.com/advisories/GHSA-grvv-h2f9-7v9c

Repository: https://github.com/matrix-org/gomatrixserverlib
Blast Radius: 6.8

Affected Packages