Bug 2247493 (CVE-2023-43796)

Summary:	CVE-2023-43796 net-im/synapse: Leak of remote user device information
Product:	[Other] Security Response	Reporter:	Robb Gatica <rgatica>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	synapse 1.95.1, synapse 1.96.0rc1	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
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Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2247494
Bug Blocks:

Description Robb Gatica 2023-11-01 15:18:58 UTC

Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. System administrators are encouraged to upgrade to Synapse 1.95.1 or 1.96.0rc1 to receive a patch. As a workaround, the `federation_domain_whitelist` can be used to limit federation traffic with a homeserver.


https://github.com/matrix-org/synapse/security/advisories/GHSA-mp92-3jfm-3575
https://github.com/matrix-org/synapse/commit/daec55e1fe120c564240c5386e77941372bf458f

Comment 1 Robb Gatica 2023-11-01 15:19:14 UTC

Created synapse tracking bugs for this issue:

Affects: fedora-all [bug 2247494]