CVE-2023-45129 matrix-synapse vulnerable to denial of service due to malicious server ACL events

What is CVE-2023-45129?

CVE-2023-45129 is a medium-severity vulnerability in Fedoraproject Fedora, published on 10 Oct 2023.

Official description

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Prior to version 1.94.0, 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. Server administrators are advised to upgrade to Synapse 1.94.0 or later. As a workaround, rooms with malicious server ACL events can be purged and blocked using the admin API.

Weakness: CWE-770

Which versions are affected by CVE-2023-45129?

3 open source packages ship an affected version, including matrix-synapse. It affects 2 products.

Products include Fedoraproject Fedora, Matrix Synapse.

How do I fix CVE-2023-45129?

Upgrade matrix-synapse to 1.94.0 or later.

Is CVE-2023-45129 being exploited?

There is no known exploitation of CVE-2023-45129 in the wild and no public exploit code.

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• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-5chr-wjw5-3gq4, PYSEC-2023-199, UBUNTU-CVE-2023-45129, openSUSE-SU-2024:13320-1.