CVE-2021-41281 – matrix-synapse

Package

Manager: pip
Name: matrix-synapse
Vulnerable Version: >=0 <1.47.1

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00549 pctl0.6694

Details

Path traversal in Matrix Synapse ### Impact Synapse instances with the media repository enabled can be tricked into downloading a file from a remote server into an arbitrary directory, potentially outside the media store directory. The last two directories and file name of the path are chosen randomly by Synapse and cannot be controlled by an attacker, which limits the impact. Homeservers with the media repository disabled are unaffected. Homeservers configured with a federation whitelist are also unaffected. ### Patches Server administrators should upgrade to 1.47.1 or later. ### Workarounds Server administrators using a reverse proxy could, at the expense of losing media functionality, block the following endpoints: * `/_matrix/media/r0/download/{serverName}/{mediaId}` * `/_matrix/media/r0/download/{serverName}/{mediaId}/{fileName}` * `/_matrix/media/r0/thumbnail/{serverName}/{mediaId}` Alternatively, non-containerized deployments can be adapted to use the hardened systemd config, located at `contrib/systemd/override-hardened.conf`. ### References n/a ### For more information If you have any questions or comments about this advisory, e-mail us at security@matrix.org.

Metadata

Created: 2021-11-23T21:58:56Z
Modified: 2024-09-24T15:47:18Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/11/GHSA-3hfw-x7gx-437c/GHSA-3hfw-x7gx-437c.json
CWE IDs: ["CWE-22"]
Alternative ID: GHSA-3hfw-x7gx-437c
Finding: F063
Auto approve: 1