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Vulnerability Details : CVE-2021-29471

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 1.33.2 "Push rules" can specify conditions under which they will match, including `event_match`, which matches event content against a pattern including wildcards. Certain patterns can cause very poor performance in the matching engine, leading to a denial-of-service when processing moderate length events. The issue is patched in version 1.33.2. A potential workaround might be to prevent users from making custom push rules, by blocking such requests at a reverse-proxy.
Publish Date : 2021-05-11 Last Update Date : 2021-08-02
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- CVSS Scores & Vulnerability Types

CVSS Score
5.0
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 400

- Products Affected By CVE-2021-29471

# Product Type Vendor Product Version Update Edition Language
1 Application Matrix Synapse * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Matrix Synapse 1

- References For CVE-2021-29471

https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c
https://lists.fedoraproject.org/archives/list/[email protected]/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/
FEDORA FEDORA-2021-a627cfd31e
https://github.com/matrix-org/synapse/releases/tag/v1.33.2
https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85 CONFIRM

- Metasploit Modules Related To CVE-2021-29471

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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