Arbitrary Code Injection Affecting matrix-synapse package, versions <1.27.0-1
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Test your applications- Snyk ID SNYK-DEBIANUNSTABLE-MATRIXSYNAPSE-1089409
- published 27 Mar 2021
- disclosed 26 Mar 2021
Introduced: 26 Mar 2021
CVE-2021-21333 Open this link in a new tabHow to fix?
Upgrade Debian:unstable matrix-synapse to version 1.27.0-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream matrix-synapse package and not the matrix-synapse package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2021-21333
- https://github.com/matrix-org/synapse/security/advisories/GHSA-c5f8-35qr-q4fm
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/
- https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df
- https://github.com/matrix-org/synapse/pull/9200
- https://github.com/matrix-org/synapse/releases/tag/v1.27.0
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/