CVE-2017-3156 Explained : Impact and Mitigation

Apache CXF versions prior to 3.0.13 and 3.1.x prior to 3.1.10 are vulnerable to a timing attack related to OAuth2 Hawk and JOSE MAC Validation code.

Understanding CVE-2017-3156

What is CVE-2017-3156?

The vulnerability in Apache CXF versions allows sophisticated timing attacks due to the absence of a constant time MAC signature comparison algorithm.

The Impact of CVE-2017-3156

This vulnerability could be exploited by attackers to compromise the security of systems using affected versions of Apache CXF.

Technical Details of CVE-2017-3156

Vulnerability Description

The issue lies in the OAuth2 Hawk and JOSE MAC Validation code of Apache CXF, making it susceptible to timing attacks.

Affected Systems and Versions

Product: Apache CXF
Vendor: Apache Software Foundation
Vulnerable Versions:
Apache CXF prior to 3.0.13
Apache CXF 3.1.x prior to 3.1.10

Exploitation Mechanism

Attackers can exploit the vulnerability by leveraging sophisticated timing attacks due to the lack of a constant time MAC signature comparison algorithm.

Mitigation and Prevention

Immediate Steps to Take

Update Apache CXF to version 3.0.13 or 3.1.10, which contain fixes for the vulnerability.
Monitor for any unusual activities on the network that could indicate exploitation attempts.

Long-Term Security Practices

Regularly update software and apply security patches to prevent known vulnerabilities.
Implement network monitoring and intrusion detection systems to detect and respond to potential attacks.

Patching and Updates

Ensure that all software components, including Apache CXF, are regularly updated to the latest secure versions.