Synapse instances with the media repository enabled can be tricked into downloading a file from a remote server into an arbitrary directory. The last 2 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 with a federation whitelist are also unaffected, since Synapse will check the remote hostname, including the trailing `../`s, against the whitelist. Server administrators should upgrade to 1.47.1 or later. Server administrators using a reverse proxy could, at the expense of losing media functionality, may block the certain endpoints as a workaround. Alternatively, non-containerized deployments can be adapted to use the hardened systemd config. Reference: https://github.com/matrix-org/synapse/releases/tag/v1.47.1 https://github.com/matrix-org/synapse/security/advisories/GHSA-3hfw-x7gx-437c https://github.com/matrix-org/synapse/commit/91f2bd090
Created matrix-synapse tracking bugs for this issue: Affects: fedora-all [bug 2027230]
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.