CVE-2023-45129: matrix-synapse vulnerable to denial of service due to malicious server ACL events
First published: Tue Oct 10 2023(Updated: )
### Impact A malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service. Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected. ### Patches Server administrators are advised to upgrade to Synapse 1.94.0 or later. ### Workarounds Rooms with malicious server ACL events can be [purged and blocked](https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version) using the admin API.
Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/matrix-synapse | <1.94.0 | 1.94.0 |
| Matrix Synapse | <1.94.0 | |
| Fedoraproject Fedora | =37 | |
| Fedoraproject Fedora | =38 | |
| <1.94.0 | ||
| =37 | ||
| =38 |
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Reference Links
- https://github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4
- https://nvd.nist.gov/vuln/detail/CVE-2023-45129
- https://github.com/matrix-org/synapse/pull/16360
- https://github.com/matrix-org/synapse/commit/f84da3c32ec74cf054e2fd6d10618aa4997cffaa
- https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version
- https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2023-199.yaml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY/
- https://security.gentoo.org/glsa/202401-12
- https://github.com/advisories/GHSA-5chr-wjw5-3gq4 (Advisory)
Frequently Asked Questions
What is CVE-2023-45129?
CVE-2023-45129 is a vulnerability in Synapse, an open-source Matrix homeserver, that can lead to a persistent denial of service due to a malicious server ACL event.
What is the impact of CVE-2023-45129?
CVE-2023-45129 can temporarily or permanently impact the performance of the server, resulting in a persistent denial of service.
How does CVE-2023-45129 affect homeservers running on a closed federation?
Homeservers running on a closed federation, that do not need to use server ACLs, are not affected by CVE-2023-45129.
What is the severity of CVE-2023-45129?
CVE-2023-45129 has a severity rating of medium with a CVSS score of 4.9.
How can I fix CVE-2023-45129?
To fix CVE-2023-45129, server administrators are advised to upgrade to version 1.94.0 of matrix-synapse.
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