What is CVE-2022-39203?

CVE-2022-39203 is a vulnerability in matrix-appservice-irc where attackers can combine an attacker-owned channel and an existing channel, granting themselves permissions in the channel.

What is the severity of CVE-2022-39203?

CVE-2022-39203 has a severity rating of high (8.8).

How does CVE-2022-39203 affect Matrix Matrix Irc Bridge?

CVE-2022-39203 affects Matrix Matrix Irc Bridge version up to and exclusive of 0.35.0.

How can an attacker exploit CVE-2022-39203?

An attacker can exploit CVE-2022-39203 by specifying a specific string of characters that confuses the bridge and allows them to grant themselves permissions in a channel.

Is there a fix for CVE-2022-39203?

Yes, a fix for CVE-2022-39203 is available in version 0.35.0 of matrix-appservice-irc.

Vulnerability/
CVE-2022-39203

high

8.8

CWE

269

13/9/2022

3/8/2024

CVE-2022-39203: Parsing issue in matrix-org/node-irc leading to room takeovers

First published: Tue Sep 13 2022(Updated: )

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.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Matrix Matrix Irc Bridge	<0.35.0

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Frequently Asked Questions

What is CVE-2022-39203?
CVE-2022-39203 is a vulnerability in matrix-appservice-irc where attackers can combine an attacker-owned channel and an existing channel, granting themselves permissions in the channel.
What is the severity of CVE-2022-39203?
CVE-2022-39203 has a severity rating of high (8.8).
How does CVE-2022-39203 affect Matrix Matrix Irc Bridge?
CVE-2022-39203 affects Matrix Matrix Irc Bridge version up to and exclusive of 0.35.0.
How can an attacker exploit CVE-2022-39203?
An attacker can exploit CVE-2022-39203 by specifying a specific string of characters that confuses the bridge and allows them to grant themselves permissions in a channel.
Is there a fix for CVE-2022-39203?
Yes, a fix for CVE-2022-39203 is available in version 0.35.0 of matrix-appservice-irc.

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