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matrix-appservice-irc vulnerable to IRC mode parameter confusion

Moderate severity GitHub Reviewed Published Sep 13, 2022 in matrix-org/matrix-appservice-irc • Updated Jan 29, 2023

Package

npm matrix-appservice-irc (npm)

Affected versions

< 0.35.0

Patched versions

0.35.0

Description

Impact

IRC allows you to specify multiple modes in a single mode command. Due to a bug in the underlying matrix-org/node-irc library, affected versions of matrix-appservice-irc perform parsing of such modes incorrectly, potentially resulting in the wrong user being given permissions.

Mode commands can only be executed by privileged users, so this can only be abused if an operator is tricked into running the command on behalf of an attacker.

Patches

The vulnerability has been patched in matrix-appservice-irc 0.35.0.

Workarounds

Refrain from entering mode commands suggested by untrusted users. Avoid using multiple modes in a single command.

References

Credits

Discovered and reported by Val Lorentz.

For more information

If you have any questions or comments about this advisory email us at [email protected].

References

@dkasak dkasak published to matrix-org/matrix-appservice-irc Sep 13, 2022
Published by the National Vulnerability Database Sep 13, 2022
Published to the GitHub Advisory Database Sep 15, 2022
Reviewed Sep 15, 2022
Last updated Jan 29, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L

EPSS score

0.102%
(43rd percentile)

Weaknesses

CVE ID

CVE-2022-39202

GHSA ID

GHSA-cq7q-5c67-w39w

Source code

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