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Events can be crafted to leak parts of targeted messages from other bridged rooms

Low
Half-Shot published GHSA-c7hh-3v6c-fj4q Aug 4, 2023

Package

npm matrix-appservice-irc (npm)

Affected versions

<= 1.0.0

Patched versions

1.0.1

Description

Impact

It was possible to craft an event such that it would leak part of a targeted message event from another bridged room. This required knowing an event ID to target.

Patches

Please upgrade to 1.0.1.

Workarounds

You can set the matrixHandler.eventCacheSize config value to 0 to workaround this bug. However, this may impact performance.

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.

Severity

Low

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
High
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
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:H/PR:L/UI:N/S:C/C:L/I:N/A:N

CVE ID

CVE-2023-38700

Weaknesses

No CWEs