Vulnerability Details : CVE-2022-39203

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.
Published 2022-09-13 19:15:13
Updated 2022-09-16 02:38:32
Source GitHub, Inc.
View at NVD,   CVE.org

Products affected by CVE-2022-39203

Exploit prediction scoring system (EPSS) score for CVE-2022-39203

EPSS FAQ
0.10%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 42 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2022-39203

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
8.8
 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
2.8
5.9
 NIST
8.8
 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
2.8
5.9
 GitHub, Inc.

CWE ids for CVE-2022-39203

  • The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
    Assigned by: security-advisories@github.com (Primary)

References for CVE-2022-39203

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