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CVE-2022-39203

8.8 · HIGH

matrix-appservice-irc is an open source Node.js IRC bridge for Matrix.

Published Sep 13, 2022CWE-269EPSS 0.86%

Overview

CVE-2022-39203 is a high-severity vulnerability. It was published on September 13, 2022 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

matrix-appservice-irc is an open source Node.js IRC bridge for Matrix. Attackers can specify a specific string of characters, which would confuse the bridge into combining an attacker-owned channel and an existing channel, allowing them to grant themselves permissions in the channel. The vulnerability has been patched in matrix-appservice-irc 0.35.0. As a workaround operators may disable dynamic channel joining via `dynamicChannels.enabled` to prevent users from joining new channels, which prevents any new channels being bridged outside of what is already bridged, and what is specified in the config.

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/matrix-appservice-irc/security/advisories/GHSA-xvqg-mv25-rwvwRefmatrix.org/blog/2022/09/13/security-release-of-matrix-appservice-irc-0-35-0-high-severity/GitHubgithub.com/matrix-org/matrix-appservice-irc/security/advisories/GHSA-xvqg-mv25-rwvwRefmatrix.org/blog/2022/09/13/security-release-of-matrix-appservice-irc-0-35-0-high-severity/

How CyberStrike helps

Frequently asked questions

What is CVE-2022-39203?

CVE-2022-39203 is a high-severity vulnerability. It was published on September 13, 2022 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2022-39203?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-39203?

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-2022-39203?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-39203 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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