CVE-2021-21392
CVE-2021-21392 · Open redirect via transitional IPv6 addresses on dual-stack networks
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 6.3 · Medium · EPSS 0.9% · Fix available
- Published
- Updated
Affected products and versions
synapse
- Versions
- < 1.28.0: Affected
No fix published
matrix-synapse PyPI
- Versions
- 0.33.5
- 0.33.5.1
- 0.33.6
- 0.33.6rc1
- 0.33.7
- 0.33.7rc1
- 0.33.7rc2
- 0.33.8
- 0.33.8rc2
- 0.33.9
- 0.34.0
- 0.34.0.1
- 0.34.0rc1
- 0.34.0rc2
- 0.34.1.1
- 0.99.0
- 0.99.0rc1
- 0.99.0rc2
- 0.99.0rc3
- 0.99.0rc4
- 0.99.1
- 0.99.1.1
- 0.99.1rc1
- 0.99.1rc2
- 0.99.2
- 0.99.2rc1
- 0.99.3
- 0.99.3.1
- 0.99.3.2
- 0.99.3rc1
- 0.99.4
- 0.99.4rc1
- 0.99.5
- 0.99.5.1
- 0.99.5.2
- 0.99.5rc1
- 1.0.0
- 1.0.0rc1
- 1.0.0rc2
- 1.0.0rc3
- 1.1.0
- 1.1.0rc1
- 1.1.0rc2
- 1.10.0
- 1.10.0rc1
- 1.10.0rc2
- 1.10.0rc3
- 1.10.0rc5
- 1.10.1
- 1.11.0
- 1.11.0rc1
- 1.11.1
- 1.12.0
- 1.12.0rc1
- 1.12.1
- 1.12.1rc1
- 1.12.2
- 1.12.3
- 1.12.4
- 1.12.4rc1
- 1.13.0
- 1.13.0rc1
- 1.13.0rc2
- 1.13.0rc3
- 1.14.0
- 1.14.0rc1
- 1.14.0rc2
- 1.15.0
- 1.15.0rc1
- 1.15.1
- 1.15.2
- 1.16.0
- 1.16.0rc1
- 1.16.0rc2
- 1.16.1
- 1.17.0
- 1.17.0rc1
- 1.18.0
- 1.18.0rc1
- 1.18.0rc2
- 1.19.0
- 1.19.0rc1
- 1.19.1
- 1.19.1rc1
- 1.19.2
- 1.19.3
- 1.2.0
- 1.2.0rc1
- 1.2.0rc2
- 1.2.1
- 1.20.0
- 1.20.0rc1
- 1.20.0rc2
- 1.20.0rc3
- 1.20.0rc4
- 1.20.0rc5
- 1.20.1
- 1.21.0
- 1.21.0rc1
- 1.21.0rc2
- 1.21.0rc3
- 1.21.1
- 1.21.2
- 1.22.0
- 1.22.0rc1
- 1.22.0rc2
- 1.22.1
- 1.23.0
- 1.23.0rc1
- 1.23.1
- 1.24.0
- 1.24.0rc1
- 1.24.0rc2
- 1.25.0
- 1.25.0rc1
- 1.26.0
- 1.26.0rc1
- 1.26.0rc2
- 1.27.0
- 1.27.0rc1
- 1.27.0rc2
- 1.3.0
- 1.3.0rc1
- 1.3.1
- 1.4.0
- 1.4.0rc1
- 1.4.0rc2
- 1.4.1
- 1.4.1rc1
- 1.5.0
- 1.5.0rc1
- 1.5.0rc2
- 1.5.1
- 1.6.0
- 1.6.0rc1
- 1.6.0rc2
- 1.6.1
- 1.7.0
- 1.7.0rc1
- 1.7.0rc2
- 1.7.1
- 1.7.2
- 1.7.3
- 1.8.0
- 1.8.0rc1
- 1.9.0
- 1.9.0.dev1
- 1.9.0.dev2
- 1.9.0rc1
- 1.9.1
- Affected ranges
- ECOSYSTEM: < 1.28.0rc1
Update to 1.28.0rc1
matrix-synapse PyPI
- Versions
- 0.33.5
- 0.33.5.1
- 0.33.6rc1
- 0.33.6
- 0.33.7rc1
- 0.33.7rc2
- 0.33.7
- 0.33.8rc2
- 0.33.8
- 0.33.9
- 0.34.0rc1
- 0.34.0rc2
- 0.34.0
- 0.34.0.1
- 0.34.1.1
- 0.99.0rc1
- 0.99.0rc2
- 0.99.0rc3
- 0.99.0rc4
- 0.99.0
- 0.99.1rc1
- 0.99.1rc2
- 0.99.1
- 0.99.1.1
- 0.99.2rc1
- 0.99.2
- 0.99.3rc1
- 0.99.3
- 0.99.3.1
- 0.99.3.2
- 0.99.4rc1
- 0.99.4
- 0.99.5rc1
- 0.99.5
- 0.99.5.1
- 0.99.5.2
- 1.0.0rc1
- 1.0.0rc2
- 1.0.0rc3
- 1.0.0
- 1.1.0rc1
- 1.1.0rc2
- 1.1.0
- 1.2.0rc1
- 1.2.0rc2
- 1.2.0
- 1.2.1
- 1.3.0rc1
- 1.3.0
- 1.3.1
- 1.4.0rc1
- 1.4.0rc2
- 1.4.0
- 1.4.1rc1
- 1.4.1
- 1.5.0rc1
- 1.5.0rc2
- 1.5.0
- 1.5.1
- 1.6.0rc1
- 1.6.0rc2
- 1.6.0
- 1.6.1
- 1.7.0rc1
- 1.7.0rc2
- 1.7.0
- 1.7.1
- 1.7.2
- 1.7.3
- 1.8.0rc1
- 1.8.0
- 1.9.0.dev1
- 1.9.0.dev2
- 1.9.0rc1
- 1.9.0
- 1.9.1
- 1.10.0rc1
- 1.10.0rc2
- 1.10.0rc3
- 1.10.0rc5
- 1.10.0
- 1.10.1
- 1.11.0rc1
- 1.11.0
- 1.11.1
- 1.12.0rc1
- 1.12.0
- 1.12.1rc1
- 1.12.1
- 1.12.2
- 1.12.3
- 1.12.4rc1
- 1.12.4
- 1.13.0rc1
- 1.13.0rc2
- 1.13.0rc3
- 1.13.0
- 1.14.0rc1
- 1.14.0rc2
- 1.14.0
- 1.15.0rc1
- 1.15.0
- 1.15.1
- 1.15.2
- 1.16.0rc1
- 1.16.0rc2
- 1.16.0
- 1.16.1
- 1.17.0rc1
- 1.17.0
- 1.18.0rc1
- 1.18.0rc2
- 1.18.0
- 1.19.0rc1
- 1.19.0
- 1.19.1rc1
- 1.19.1
- 1.19.2
- 1.19.3
- 1.20.0rc1
- 1.20.0rc2
- 1.20.0rc3
- 1.20.0rc4
- 1.20.0rc5
- 1.20.0
- 1.20.1
- 1.21.0rc1
- 1.21.0rc2
- 1.21.0rc3
- 1.21.0
- 1.21.1
- 1.21.2
- 1.22.0rc1
- 1.22.0rc2
- 1.22.0
- 1.22.1
- 1.23.0rc1
- 1.23.0
- 1.23.1
- 1.24.0rc1
- 1.24.0rc2
- 1.24.0
- 1.25.0rc1
- 1.25.0
- 1.26.0rc1
- 1.26.0rc2
- 1.26.0
- 1.27.0rc1
- 1.27.0rc2
- 1.27.0
- 1.28.0rc1
- Affected ranges
- ECOSYSTEM: < 1.28.0
Update to 1.28.0
matrix-synapse Ubuntu:Pro:18.04:LTS
- Versions
- 0.19.2+dfsg-6
- 0.24.0+dfsg-1
- 0.24.0+dfsg-1ubuntu0.1~esm1
- 0.24.0+dfsg-1ubuntu0.1~esm4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
matrix-synapse Ubuntu:Pro:20.04:LTS
- Versions
- 1.3.0-1
- 1.4.0-1
- 1.5.0-1
- 1.5.1-1
- 1.6.0-1
- 1.6.1-1
- 1.7.0-2
- 1.7.1-1
- 1.7.2-1
- 1.7.3-1
- 1.8.0-1
- 1.9.0-1
- 1.9.1-1
- 1.10.0-1
- 1.10.0-2
- 1.11.0-1
- 1.11.0-1ubuntu0.1~esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
matrix-synapse Ubuntu:Pro:22.04:LTS
- Versions
- 1.39.0-1
- 1.47.0-2
- 1.47.1-1
- 1.48.0-1
- 1.49.0-1
- 1.49.2-1
- 1.50.1-1
- 1.50.2-1
- 1.51.0-1
- 1.52.0-1
- 1.53.0-1
- 1.53.0-1ubuntu0.1~esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
Original sources
- https://pypi.org/project/matrix-synapse/
- https://github.com/matrix-org/synapse/security/advisories/GHSA-5wrh-4jwv-5w78
- https://github.com/matrix-org/synapse/pull/9240
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/
- https://nvd.nist.gov/vuln/detail/CVE-2021-21392