Main Vulnerability Database Vulnerabilities #VU58357

Path traversal in Synapse - CVE-2021-41281

Published: November 24, 2021

Vulnerability identifier: #VU58357

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-41281

CWE-ID: CWE-22

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when downloading remote media. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.

Affected software

Synapse
Fedora
matrix-synapse

How to mitigate CVE-2021-41281

Install update from vendor's website.

Synapse - update to 1.47.1
matrix-synapse - addressed in versions 1.47.1-1.fc34, 1.47.1-1.fc35, 1.48.0-1.fc34, 1.48.0-1.fc35

External References

https://github.com/matrix-org/synapse/releases/tag/v1.47.1
https://github.com/matrix-org/synapse/security/advisories/GHSA-3hfw-x7gx-437c
https://github.com/matrix-org/synapse/commit/91f2bd090

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