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 1.25.0, a malicious homeserver could redirect requests to their .well-known file to a large file. This can lead to a denial of service attack where homeservers will consume significantly more resources when requesting the .well-known file of a malicious homeserver. This affects any server which accepts federation requests from untrusted servers. Issue is resolved in version 1.25.0. As a workaround the `federation_domain_whitelist` setting can be used to restrict the homeservers communicated with over federation.
References
Link | Resource |
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https://github.com/matrix-org/synapse/commit/ff5c4da1289cb5e097902b3e55b771be342c29d6 | Patch Third Party Advisory |
https://github.com/matrix-org/synapse/pull/8950 | Patch Third Party Advisory |
https://github.com/matrix-org/synapse/releases/tag/v1.25.0 | Third Party Advisory |
https://github.com/matrix-org/synapse/security/advisories/GHSA-2hwx-mjrm-v3g8 | Patch Third Party Advisory |
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/ |
Configurations
History
07 Nov 2023, 03:29
Type | Values Removed | Values Added |
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References |
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24 Oct 2022, 20:49
Type | Values Removed | Values Added |
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CWE | CWE-770 |
23 Nov 2021, 22:27
Type | Values Removed | Values Added |
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CPE | cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | |
References |
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05 Mar 2021, 18:25
Type | Values Removed | Values Added |
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References | (CONFIRM) https://github.com/matrix-org/synapse/security/advisories/GHSA-2hwx-mjrm-v3g8 - Patch, Third Party Advisory | |
References | (MISC) https://github.com/matrix-org/synapse/commit/ff5c4da1289cb5e097902b3e55b771be342c29d6 - Patch, Third Party Advisory | |
References | (MISC) https://github.com/matrix-org/synapse/pull/8950 - Patch, Third Party Advisory | |
References | (MISC) https://github.com/matrix-org/synapse/releases/tag/v1.25.0 - Third Party Advisory | |
CVSS |
v2 : v3 : |
v2 : 4.3
v3 : 6.5 |
CPE | cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:* |
26 Feb 2021, 18:34
Type | Values Removed | Values Added |
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New CVE |
Information
Published : 2021-02-26 18:15
Updated : 2023-12-10 13:41
NVD link : CVE-2021-21274
Mitre link : CVE-2021-21274
CVE.ORG link : CVE-2021-21274
JSON object : View
Products Affected
matrix
- synapse
fedoraproject
- fedora