CVE-2019-19963 : Security Advisory and Response

In a non-default configuration where DSA is enabled, a vulnerability was found in wolfSSL prior to version 4.3.0. During modular inversion of the nonce, DSA signing utilizes the BEEA algorithm, which exposes the nonce to a side-channel attack.

Understanding CVE-2019-19963

This CVE identifies a security issue in wolfSSL versions prior to 4.3.0 when DSA is enabled, potentially leading to a side-channel attack.

What is CVE-2019-19963?

CVE-2019-19963 is a vulnerability in wolfSSL that arises when DSA signing uses the BEEA algorithm during modular inversion of the nonce, making the nonce susceptible to a side-channel attack.

The Impact of CVE-2019-19963

The vulnerability could allow malicious actors to exploit the side-channel attack and potentially compromise the security of systems using wolfSSL prior to version 4.3.0.

Technical Details of CVE-2019-19963

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The issue in wolfSSL before version 4.3.0 occurs in a specific configuration where DSA is enabled. The vulnerability arises from the use of the BEEA algorithm during DSA signing, exposing the nonce to side-channel attacks.

Affected Systems and Versions

Affected Version: Prior to 4.3.0
Systems with DSA enabled in a non-default configuration

Exploitation Mechanism

Exploitation involves leveraging the side-channel attack on the nonce during DSA signing.

Mitigation and Prevention

Protecting systems from CVE-2019-19963 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update wolfSSL to version 4.3.0 or later to mitigate the vulnerability.
Disable DSA if not required in the system configuration.

Long-Term Security Practices

Regularly monitor for security updates and patches from wolfSSL.
Implement secure coding practices to prevent similar vulnerabilities.
Conduct security assessments to identify and address potential weaknesses.
Educate developers and administrators on secure cryptographic practices.
Employ cryptographic libraries and algorithms with robust security features.

Patching and Updates

Ensure timely application of patches and updates provided by wolfSSL to address known vulnerabilities and enhance the security of the system.