CVE-2020-15074 : Exploit Details and Defense Strategies

OpenVPN Access Server older than version 2.8.4 and version 2.9.5 generates new user authentication tokens instead of reusing existing tokens on reconnect, potentially allowing circumvention of the initial token expiry timestamp.

Understanding CVE-2020-15074

This CVE involves an authentication bypass vulnerability in OpenVPN Access Server.

What is CVE-2020-15074?

CVE-2020-15074 is a security vulnerability in OpenVPN Access Server that allows attackers to bypass authentication by exploiting the way user authentication tokens are handled.

The Impact of CVE-2020-15074

The vulnerability could lead to unauthorized access to the OpenVPN Access Server, compromising the security and integrity of the system.

Technical Details of CVE-2020-15074

This section provides more technical insights into the CVE.

Vulnerability Description

OpenVPN Access Server versions prior to 2.8.4 and version 2.9.5 are affected by the issue of generating new user authentication tokens instead of reusing existing tokens, potentially enabling an authentication bypass.

Affected Systems and Versions

Product: OpenVPN Access Server
Vendor: n/a
Versions Affected: 2.8.3 and prior versions, in addition to 2.9.5

Exploitation Mechanism

The vulnerability allows attackers to exploit the token generation process to bypass authentication mechanisms, potentially gaining unauthorized access.

Mitigation and Prevention

Protecting systems from CVE-2020-15074 is crucial for maintaining security.

Immediate Steps to Take

Upgrade OpenVPN Access Server to version 2.8.4 or newer to mitigate the vulnerability.
Monitor for any unauthorized access or unusual activities on the server.

Long-Term Security Practices

Regularly update and patch software to address security vulnerabilities promptly.
Implement multi-factor authentication to enhance access control and security.

Patching and Updates

Stay informed about security updates and patches released by OpenVPN.