medium
4.3
CWE
285
Advisory Published
CVE Published
Updated

CVE-2023-42453: Improper validation of receipts allows forged read receipts in matrix synapse

First published: Tue Sep 26 2023(Updated: )

### Impact Users were able to forge read receipts for any event (if they knew the room ID and event ID). Note that the users were not able to view the events, but simply mark it as read. This could be confusing as clients will show the event as read by the user, even if they are not in the room. ### Patches https://github.com/matrix-org/synapse/pull/16327 ### Workarounds There is no workaround.

Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
pip/matrix-synapse>=0.34.0<1.93.0
1.93.0
>=1.34.0<1.93.0
=37
=38
Matrix Synapse>=1.34.0<1.93.0
Fedoraproject Fedora=37
Fedoraproject Fedora=38

Remedy

https://github.com/matrix-org/synapse/pull/16327

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Reference Links

Frequently Asked Questions

  • What is the impact of CVE-2023-42453?

    Users were able to forge read receipts for any event (if they knew the room ID and event ID), causing clients to show the event as read by the user even if they are not in the room.

  • How can users forge read receipts with CVE-2023-42453?

    By knowing the room ID and event ID, users could mark any event as read.

  • What software is affected by CVE-2023-42453?

    The 'matrix-synapse' package with a version between 0.34.0 and 1.93.0, installed via 'pip'.

  • How can I fix CVE-2023-42453?

    Update the 'matrix-synapse' package to version 1.93.0 or higher using 'pip' package manager.

  • Where can I find more information about CVE-2023-42453?

    You can find more information about CVE-2023-42453 on the GitHub security advisory page.

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