Bug 2124168 (CVE-2022-31152) - CVE-2022-31152 synapse: Denial of service due to incorrect application of event authorization rules
Summary: CVE-2022-31152 synapse: Denial of service due to incorrect application of eve...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2022-31152
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2124169
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-09-05 06:09 UTC by Sandipan Roy
Modified: 2022-09-05 22:45 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2022-09-05 22:45:47 UTC


Attachments (Terms of Use)

Description Sandipan Roy 2022-09-05 06:09:52 UTC
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.2/rooms/v9/#authorization-rules) which must be checked when determining if an event should be accepted into a room. In versions of Synapse up to and including version 1.61.0, some of these rules are not correctly applied. An attacker could craft events which would be accepted by Synapse but not a spec-conformant server, potentially causing divergence in the room state between servers. Administrators of homeservers with federation enabled are advised to upgrade to version 1.62.0 or higher. Federation can be disabled by setting [`federation_domain_whitelist`](https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#federation_domain_whitelist) to an empty list (`[]`) as a workaround.

https://github.com/matrix-org/synapse/pull/13087
https://github.com/matrix-org/synapse/pull/13088
https://github.com/matrix-org/synapse/releases/tag/v1.62.0
https://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765

Comment 1 Sandipan Roy 2022-09-05 06:10:07 UTC
Created synapse tracking bugs for this issue:

Affects: fedora-all [bug 2124169]

Comment 2 Product Security DevOps Team 2022-09-05 22:45:45 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.


Note You need to log in before you can comment on or make changes to this bug.