PT-2023-6464

CVE-2023-45129

Published

2023-09-26

Updated

2024-06-15

Description by

CVSS 4.0

6.9

Medium

MetricsAV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Synapse versions prior to 1.94.0

Description The issue is related to a malicious server ACL event that can impact performance temporarily or permanently, leading to a persistent denial of service. Homeservers running on a closed federation are not affected. The vulnerability is associated with unregulated resource distribution.

Recommendations For Synapse versions prior to 1.94.0, upgrade to Synapse 1.94.0 or later. As a temporary workaround, rooms with malicious server ACL events can be purged and blocked using the admin API.

Exploitability

Exploit

Fix

Impacts

Researchers

Vendors

Affected products

Weakness enumeration

CWE-770: Allocation of Resources Without Limits or Throttling

Related identifiers

CVE-2023-45129

BDU:2023-07183