Products
Synapse Matrix homeserver
- before 1.105.1
Source
security-advisories@github.com
Tags
CVE-2024-31208 details
Last Modified : April 23, 2024, 6:15 p.m.
Description
Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room with Synapse instances before 1.105.1, can dispatch specially crafted events to exploit a weakness in the V2 state resolution algorithm. This can induce high CPU consumption and accumulate excessive data in the database of such instances, resulting in a denial of service. Servers in private federations, or those that do not federate, are not affected. Server administrators should upgrade to 1.105.1 or later. Some workarounds are available. One can ban the malicious users or ACL block servers from the rooms and/or leave the room and purge the room using the admin API.
CVSS Score
| 1 | 2 | 3 | 4 | 5 | 6.5 | 7 | 8 | 9 | 10 |
|---|
Weakness
| Weakness | Name | Description |
|---|
CVSS Data
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Base Score
6.5
Exploitability Score
Impact Score
Base Severity
MEDIUM
Vector String : CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
| URL | Source |
|---|---|
| https://github.com/element-hq/synapse/commit/55b0aa847a61774b6a3acdc4b177a20dc019f01a | security-advisories@github.com |
| https://github.com/element-hq/synapse/releases/tag/v1.105.1 | security-advisories@github.com |
| https://github.com/element-hq/synapse/security/advisories/GHSA-3h7q-rfh9-xm4v | security-advisories@github.com |