Synapse does not apply enough checks to servers requesting auth events of events in a room
CVE-2022-39335

5MEDIUM

Key Information:

Vendor

Matrix-org

Status
Synapse
Vendor
CVE Published:
26 May 2023

What is CVE-2022-39335?

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade.

Affected Version(s)

synapse < 1.69.0

References

https://github.com/matrix-org/synapse/security/advisories...
x_refsource_CONFIRM
https://github.com/matrix-org/synapse/issues/13288
x_refsource_MISC
https://github.com/matrix-org/synapse/pull/13823
x_refsource_MISC

CVSS V3.1

Score:
5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.