Main Vulnerability Database Vulnerabilities #VU37030

Input validation error in Synapse - CVE-2018-12423

Published: June 14, 2018 / Updated: August 8, 2020

Vulnerability identifier: #VU37030

CSH Severity: Medium

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

CVE-ID: CVE-2018-12423

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote non-authenticated attacker to manipulate data.

In Synapse before 0.31.2, unauthorised users can hijack rooms when there is no m.room.power_levels event in force.

Synapse
Ubuntu
matrix-synapse (Ubuntu package)

Install update from vendor's website.

Synapse - update to 0.31.2
matrix-synapse (Ubuntu package) - update to Ubuntu Pro