CVE-2017-7522 : Vulnerability Insights and Analysis

OpenVPN versions before 2.4.3 and 2.3.17 are vulnerable to a denial-of-service attack by an authenticated remote attacker sending a certificate with a NULL character.

Understanding CVE-2017-7522

Before version 2.4.3 and prior to version 2.3.17, OpenVPN is susceptible to a denial-of-service attack initiated by an authenticated remote attacker.

What is CVE-2017-7522?

CVE-2017-7522 is a vulnerability in OpenVPN versions before 2.4.3 and 2.3.17 that allows an authenticated remote attacker to conduct a denial-of-service attack by sending a certificate containing a NULL character.

The Impact of CVE-2017-7522

An authenticated remote attacker can exploit this vulnerability to cause a denial-of-service condition in affected OpenVPN versions.

Technical Details of CVE-2017-7522

OpenVPN vulnerability details and affected systems.

Vulnerability Description

OpenVPN versions before 2.4.3 and 2.3.17 are prone to denial-of-service attacks when an authenticated remote attacker sends a certificate with a NULL character.

Affected Systems and Versions

Product: OpenVPN
Vendor: OpenVPN Technologies, Inc
Vulnerable Versions:
Before 2.4.3
Before 2.3.17

Exploitation Mechanism

An authenticated remote attacker can exploit this vulnerability by sending a specially crafted certificate containing a NULL character.

Mitigation and Prevention

Protecting against and addressing CVE-2017-7522.

Immediate Steps to Take

Update OpenVPN to version 2.4.3 or later to mitigate the vulnerability.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Regularly update and patch OpenVPN to the latest versions.
Implement network segmentation and access controls to limit exposure to potential attacks.

Patching and Updates

Apply patches and updates provided by OpenVPN Technologies, Inc to address the vulnerability.