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CVE-2022-36009

MEDIUM
Published 2022-08-19T20:35:09.000Z
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CVSS Score

V3.1
5.0
/10
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.002
probability
of exploitation in the wild

There is a 0.2% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.457
Higher than 45.7% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
LOW
Integrity
LOW
Availability
LOW

Description

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

matrix-org

gomatrixserverlib

Affected Versions:

< 0.9.3 for dendrite < 723fd49 for gomatrixserverlib

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed MODERATE

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

GHSA-grvv-h2f9-7v9c

Advisory 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]).

Affected Packages

Go github.com/matrix-org/dendrite
ECOSYSTEM: ≥0 <0.9.3
Go github.com/matrix-org/gomatrixserverlib
ECOSYSTEM: ≥0 <0.0.0-20220815091947-723fd495dde8

CVSS Scoring

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

References

WEB https://github.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-grvv-h2f9-7v9c
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2022-36009
WEB https://github.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575
PACKAGE https://github.com/matrix-org/gomatrixserverlib
WEB https://matrix.org/docs/guides/moderation/#power-levels
WEB https://pkg.go.dev/vuln/GO-2022-0952

Advisory provided by GitHub Security Advisory Database. Published: August 30, 2022, Modified: August 30, 2022

References

https://github.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-grvv-h2f9-7v9c
https://github.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575
https://matrix.org/docs/guides/moderation/#power-levels
Published: 2022-08-19T20:35:09.000Z
Last Modified: 2025-04-23T17:48:13.250Z
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