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Synapse におけるリソースの枯渇に関する脆弱性
Title Synapse におけるリソースの枯渇に関する脆弱性
Summary

Synapse には、リソースの枯渇に関する脆弱性が存在します。

Possible impacts サービス運用妨害 (DoS) 状態にされる可能性があります。
Solution

ベンダより正式な対策が公開されています。ベンダ情報を参照して適切な対策を実施してください。
Publication Date Jan. 13, 2021, midnight
Registration Date Nov. 17, 2021, 4:28 p.m.
Last Update Nov. 17, 2021, 4:28 p.m.
CVSS3.0 : 警告
Score 6.5
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS2.0 : 警告
Score 4.3
Vector AV:N/AC:M/Au:N/C:N/I:N/A:P
Affected System
Matrix
Synapse 1.25.0 未満
CVE (情報セキュリティ 共通脆弱性識別子)
CWE (共通脆弱性タイプ一覧)
ベンダー情報
Change Log
No Changed Details Date of change
1 [2021年11月17日]
  掲載		 Nov. 17, 2021, 4:28 p.m.
NVD Vulnerability Information
CVE-2021-21274
Summary

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.

Publication Date Feb. 27, 2021, 3:15 a.m.
Registration Date Feb. 27, 2021, 10:02 a.m.
Last Update Nov. 21, 2024, 2:47 p.m.
Affected software configurations
Configuration1 or higher or less more than less than
cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:* 0.99.0 1.25.0
Configuration2 or higher or less more than less than
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Related information, measures and tools
Common Vulnerabilities List