Main Vulnerability Database Vulnerabilities #VU53201

Resource management error in Synapse - CVE-2021-29471

Published: May 12, 2021

Vulnerability identifier: #VU53201

CSH Severity:

CVSS v4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-29471

CWE-ID: CWE-399

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources within the push rules implementation. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Affected software

Synapse
Arch Linux
Fedora
matrix-synapse

How to mitigate CVE-2021-29471

Install updates from vendor's website.

Synapse - update to 1.33.2
matrix-synapse - addressed in versions 1.38.0-2.fc34, 1.38.1-1.fc34

External References

https://github.com/matrix-org/synapse/releases/tag/v1.33.2
https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85
https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c

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