CVE-2022-36009 – github.com/matrix-org/dendrite

Package

Manager: go
Name: github.com/matrix-org/dendrite
Vulnerable Version: >=0 <0.9.3

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

EPSS: 0.00623 pctl0.69217

Details

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 [security@matrix.org](mailto:security@matrix.org).

Metadata

Created: 2022-08-30T19:54:34Z
Modified: 2022-08-30T19:54:34Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/08/GHSA-grvv-h2f9-7v9c/GHSA-grvv-h2f9-7v9c.json
CWE IDs: ["CWE-863"]
Alternative ID: GHSA-grvv-h2f9-7v9c
Finding: F006
Auto approve: 1