matrix-synapse: Synapse is a Matrix protocol homeserver written in Python with the Twisted framework
CVE-2023-32683 is fixed in matrix-synapse on 1 platform, first by DEBIAN-CVE-2023-32683, released June 6, 2023. It is not reported as exploited. Patch Radar priority: Routine.
Synapse is a Matrix protocol homeserver written in Python with the Twisted framework. A discovered oEmbed or image URL can bypass the `url_preview_url_blacklist` setting potentially allowing server side request forgery or bypassing network policies. Impact is limited to IP addresses allowed by the `url_preview_ip_range_blacklist` setting (by default this only allows public IPs) and by the limited information returned to the client: 1. For discovered oEmbed URLs, any non-JSON response or a JSON response which includes non-oEmbed information is discarded. 2. For discovered image URLs, any non-image response is discarded. Systems which have URL preview disabled (via the `url_preview_enabled` setting) or have not configured a `url_preview_url_blacklist` are not affected. This issue has been addressed in version 1.85.0. Users are advised to upgrade. User unable to upgrade may also disable URL previews.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| matrix-synapse · Debian 14 | 1.90.0-1 | DEBIAN-CVE-2023-32683 | Jun 6, 2023 |
| matrix-synapse · Ubuntu 18.04.6 LTS (bionic) | 0.24.0+dfsg-1ubuntu0.1~esm4 | matrix-synapse 0.24.0+dfsg-1ubuntu0.1~esm4 | Oct 31, 2023 |
| matrix-synapse · Ubuntu 20.04 LTS (focal) | 1.11.0-1ubuntu0.1~esm2 | matrix-synapse 1.11.0-1ubuntu0.1~esm2 | Oct 31, 2023 |
| matrix-synapse · Ubuntu 22.04.1 LTS (jammy) | 1.53.0-1ubuntu0.1~esm2 | matrix-synapse 1.53.0-1ubuntu0.1~esm2 | Dec 3, 2024 |
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