Open Redirect Affecting matrix-synapse package, versions <1.28.0-1
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Test your applications- Snyk ID SNYK-DEBIANUNSTABLE-MATRIXSYNAPSE-1245121
- published 13 Apr 2021
- disclosed 12 Apr 2021
Introduced: 12 Apr 2021
CVE-2021-21392 Open this link in a new tabHow to fix?
Upgrade Debian:unstable matrix-synapse to version 1.28.0-1 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 1.28.0 requests to user provided domains were not restricted to external IP addresses when transitional IPv6 addresses were used. Outbound requests to federation, identity servers, when calculating the key validity for third-party invite events, sending push notifications, and generating URL previews are affected. This could cause Synapse to make requests to internal infrastructure on dual-stack networks. See referenced GitHub security advisory for details and workarounds.
References
- https://security-tracker.debian.org/tracker/CVE-2021-21392
- https://github.com/matrix-org/synapse/security/advisories/GHSA-5wrh-4jwv-5w78
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/
- https://github.com/matrix-org/synapse/pull/9240
- https://pypi.org/project/matrix-synapse/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/