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.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2022-09-13T18:15:12

Updated: 2024-08-03T12:00:42.590Z

Reserved: 2022-09-02T00:00:00

Link: CVE-2022-39203

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2022-09-13T19:15:13.030

Modified: 2024-11-21T07:17:46.837

Link: CVE-2022-39203

cve-icon Redhat

No data.