SB2020042378 - MitM attack in OpenConnect VPN client
Published: April 23, 2020 Updated: May 25, 2020
Security Bulletin ID
SB2020042378
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Man-in-the-Middle (MitM) attack (CVE-ID: CVE-2020-12105)
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 update from vendor's website.