Description
Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.27.0, the notification emails sent for notifications for missed messages or for an expiring account are subject to HTML injection. In the case of the notification for missed messages, this could allow an attacker to insert forged content into the email. The account expiry feature is not enabled by default and the HTML injection is not controllable by an attacker. This is fixed in version 1.27.0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| matrix-org | synapse | < 1.27.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | matrix-synapse | No fix yet | — |
| Ubuntu Pro 18.04 LTS | matrix-synapse | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | matrix-synapse | < 1.27.0 | 1.27.0 | GHSA-c5f8-35qr-q4fm |
References
- https://github.com/matrix-org/synapse/releases/tag/v1.27.0
- https://github.com/matrix-org/synapse/pull/9200
- https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df
- https://github.com/matrix-org/synapse/security/advisories/GHSA-c5f8-35qr-q4fm
- FEDORA-2021-a627cfd31e vendor-advisory