CVE-2021-21392
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 1.28.0 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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
matrix-synapsePyPI | < 1.28.0rc1 | 1.28.0rc1 |
Affected products
4< 1.28.0+ 1 more
- (no CPE)range: < 1.28.0
- cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*range: <1.28.0
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
10- github.com/matrix-org/synapse/pull/9240nvdPatchThird Party AdvisoryWEB
- github.com/matrix-org/synapse/security/advisories/GHSA-5wrh-4jwv-5w78nvdPatchThird Party AdvisoryWEB
- github.com/advisories/GHSA-5wrh-4jwv-5w78ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-21392ghsaADVISORY
- pypi.org/project/matrix-synapse/nvdProductThird Party Advisory
- github.com/matrix-org/synapse/commit/4ca054a4eaa714d0befb4fc30b19a1131e52c9ccghsaWEB
- github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2021-25.yamlghsaWEB
- lists.fedoraproject.org/archives/list/[email protected]/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEYghsaWEB
- pypi.org/project/matrix-synapseghsaWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/nvd
News mentions
0No linked articles in our index yet.