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GHSA-7565-cq32-vx2x

matrix-synapse vulnerable to improper validation of receipts allows forged read receipts

Source: GitHub Advisory Database (reviewed) Moderate CVE-2023-42453

Packages

EcosystemPackageAffectedFixed in
PyPI matrix-synapse >= 0.34.0, < 1.93.0 1.93.0

Details

As written in the advisory (Markdown source, shown as plain text).

### 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.

References

External links from the advisory. They lead to third-party sites.