Man-in-the-Middle (MitM) attack in OpenConnect VPN Client - CVE-2020-12105
Published: May 25, 2020
Vulnerability identifier: #VU28215
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2020-12105
CWE-ID: CWE-300
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerable software:
OpenConnect VPN Client
OpenConnect VPN Client
Software vendor:
OpenConnect
OpenConnect
Description
The vulnerability allows a remote attacker to perform a Man-in-the-Middle attack.
The vulnerability exists due to OpenConnect mishandles negative return values from X509_check_ function calls. A remote attacker can perform a Man-in-the-Middle (MitM) attack and gain access to data, transferred via VPN connection.
Remediation
Install updates from vendor's website.