CVE-2022-39335
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network with a low-privilege account. Limited direct impact.
- Exploit odds
- 0.6% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.6% in the next 30 days (EPSS).
- Severity: 5.0 MEDIUM (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.6% · EPSS, next 30 days
- Weakness
- CWE-200 · Information exposure
- Record status
- Modified
Affected
- Matrix Synapse < 1.69.0
Attack profile CVSS 3.1 · 5.0
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Raw vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2022-39335.md and follow it. Check whether this project is affected by CVE-2022-39335. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/matrix-org/synapse/pull/13823
- https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv
- https://github.com/matrix-org/synapse/pull/13823
- https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv
References
- https://github.com/matrix-org/synapse/issues/13288
- https://github.com/matrix-org/synapse/pull/13823
- https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv
- https://lists.fedoraproject.org/archives/list/[email protected]/message/T2MBNMZAFY4RCZL2VGBGAPKGB4JUPZVS/
- https://github.com/matrix-org/synapse/issues/13288
- https://github.com/matrix-org/synapse/pull/13823
- https://github.com/matrix-org/synapse/security/advisories/GHSA-45cj-f97f-ggwv
- https://lists.fedoraproject.org/archives/list/[email protected]/message/T2MBNMZAFY4RCZL2VGBGAPKGB4JUPZVS/