Insufficient verification of data authenticity in Synapse - CVE-2019-18835

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Main Vulnerability Database Vulnerabilities #VU22754

Insufficient verification of data authenticity in Synapse - CVE-2019-18835

Published: November 13, 2019


Vulnerability identifier: #VU22754
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-18835
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to the affected software mishandles signature checking on some federation APIs. Events sent over /send_join, /send_leave, and /invite may not be correctly signed, or may not come from expected hosts. A remote attacker can compromise the target system


Affected software

Synapse
Ubuntu
matrix-synapse (Ubuntu package)

How to mitigate CVE-2019-18835

Install updates from vendor's website.

Synapse - update to 1.5.0 rc2
matrix-synapse (Ubuntu package) - update to Ubuntu Pro

External References

Related Security Bulletins