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matrix-appservice-irc IRC command injection via admin commands containing newlines

Moderate severity GitHub Reviewed Published Aug 4, 2023 in matrix-org/matrix-appservice-irc • Updated Jun 20, 2024

Package

npm matrix-appservice-irc (npm)

Affected versions

<= 1.0.0

Patched versions

1.0.1

Description

Impact

It is possible to craft a command with newlines which would not be properly parsed. This would mean you could pass a string of commands as a channel name, which would then be run by the IRC bridge bot.

Patches

Versions 1.0.1 and above are patched.

Workarounds

There are no robust workarounds to the bug. You can disable dynamic channels in the config to disable the most common execution method but others may exist. It is highly recommended to upgrade the bridge.

Credits

Discovered and reported by Val Lorentz.

For more information

If you have any questions or comments about this advisory email us at security@matrix.org.

References

@Half-Shot Half-Shot published to matrix-org/matrix-appservice-irc Aug 4, 2023
Published by the National Vulnerability Database Aug 4, 2023
Published to the GitHub Advisory Database Aug 4, 2023
Reviewed Aug 4, 2023
Last updated Jun 20, 2024

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
Low
User interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None

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:L/UI:N/S:C/C:N/I:L/A:N

EPSS score

0.156%
(53rd percentile)

Weaknesses

CVE ID

CVE-2023-38690

GHSA ID

GHSA-3pmj-jqqp-2mj3

Source code

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