http://bugzilla.opensuse.org/show_bug.cgi?id=1193005 Bug ID: 1193005 Summary: VUL-1: CVE-2021-41281: synapse: Path traversal when downloading remote media Classification: openSUSE Product: openSUSE Distribution Version: Leap 15.2 Hardware: Other URL: https://smash.suse.de/issue/315558/ OS: Other Status: NEW Severity: Minor Priority: P5 - None Component: Other Assignee: screening-team-bugs@suse.de Reporter: meissner@suse.com QA Contact: security-team@suse.de Found By: Security Response Team Blocker: --- CVE-2021-41281 https://github.com/matrix-org/synapse/releases/tag/v1.47.1 https://github.com/matrix-org/synapse/security/advisories/GHSA-3hfw-x7gx-437... 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. -- You are receiving this mail because: You are on the CC list for the bug.