CVE-2024-42369: A room with itself as a its predecessor will freeze matrix-js-sdk
Impact A malicious homeserver can craft a room or room structure such that the predecessors form a cycle. The matrix-js-sdk's getRoomUpgradeHistory function will infinitely recurse in this case, causing the code to hang. This method is public but also called by the 'leaveRoomChain()' method, so leaving a room will also trigger the bug.
Even if the CVSS score would be 4.1 (AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:L) we classify this as High severity issue.
Patches This was patched in matrix-js-sdk 34.3.1.
Workarounds Sanity check rooms before passing them to the matrix-js-sdk or avoid calling either getRoomUpgradeHistory or leaveRoomChain.
References N/A.
Other sources
matrix-js-sdk is a Matrix messaging protocol Client-Server SDK for JavaScript. A malicious homeserver can craft a room or room structure such that the predecessors form a cycle. The matrix-js-sdk's getRoomUpgradeHistory function will infinitely recurse in this case, causing the code to hang. This method is public but also called by the 'leaveRoomChain()' method, so leaving a room will also trigger the bug. This was patched in matrix-js-sdk 34.3.1.
— MITRE
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-42369?
CVE-2024-42369 is considered a high severity vulnerability due to its potential to cause infinite recursion and hang the application.
How do I fix CVE-2024-42369?
To fix CVE-2024-42369, update the matrix-js-sdk to version 34.3.1 or later.
What versions of matrix-js-sdk are affected by CVE-2024-42369?
CVE-2024-42369 affects all versions of matrix-js-sdk prior to 34.3.1.
What is the impact of CVE-2024-42369?
The impact of CVE-2024-42369 is that a malicious homeserver can create a cyclic room structure causing the application to hang.
Is CVE-2024-42369 specific to any software?
Yes, CVE-2024-42369 specifically affects the matrix-js-sdk used in JavaScript environments.