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CVE-2022-36009

5.0 · MEDIUM

gomatrixserverlib is a Go library for matrix protocol federation.

Published Aug 19, 2022CWE-863EPSS 0.83%

Overview

CVE-2022-36009 is a medium-severity vulnerability. It was published on August 19, 2022 and has a CVSS 3.1 base score of 5.0 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575GitHubgithub.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-grvv-h2f9-7v9cRefmatrix.org/docs/guides/moderation/#power-levelsGitHubgithub.com/matrix-org/gomatrixserverlib/commit/723fd495dde835d078b9f2074b6b62c06dea4575GitHubgithub.com/matrix-org/gomatrixserverlib/security/advisories/GHSA-grvv-h2f9-7v9cRefmatrix.org/docs/guides/moderation/#power-levels

How CyberStrike helps

Frequently asked questions

What is CVE-2022-36009?

CVE-2022-36009 is a medium-severity vulnerability. It was published on August 19, 2022 and has a CVSS 3.1 base score of 5.0 (MEDIUM).

How severe is CVE-2022-36009?

This vulnerability has a CVSS 3.1 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-36009?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-36009?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-36009 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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