CVE-2024-52805 – matrix-synapse

Package

Manager: pip
Name: matrix-synapse
Vulnerable Version: >=0 <1.120.1

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:U/RC:R

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.00123 pctl0.32151

Details

Synapse allows unsupported content types to lead to memory exhaustion ### Impact In Synapse before 1.120.1, `multipart/form-data` requests can in certain configurations transiently increase memory consumption beyond expected levels while processing the request, which can be used to amplify denial of service attacks. ### Patches Synapse 1.120.1 resolves the issue by denying requests with unsupported `multipart/form-data` content type. ### Workarounds Limiting request sizes or blocking the `multipart/form-data` content type before the requests reach Synapse, for example in a reverse proxy, alleviates the issue. Another approach that mitigates the attack is to use a low `max_upload_size` in Synapse. ### References - https://github.com/twisted/twisted/issues/4688#issuecomment-1167705518 - https://github.com/twisted/twisted/issues/4688#issuecomment-2385711609 ### For more information If you have any questions or comments about this advisory, please email us at [security at element.io](mailto:security@element.io).

Metadata

Created: 2024-12-03T18:40:39Z
Modified: 2024-12-03T18:40:39Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/12/GHSA-rfq8-j7rh-8hf2/GHSA-rfq8-j7rh-8hf2.json
CWE IDs: ["CWE-770"]
Alternative ID: GHSA-rfq8-j7rh-8hf2
Finding: F002
Auto approve: 1