CVE-2019-14317 : Vulnerability Insights and Analysis

wolfSSL and wolfCrypt versions 4.1.0 and older have a vulnerability that allows biased DSA nonces, enabling a remote attacker to compute the long-term private key through a lattice attack.

Understanding CVE-2019-14317

This CVE involves a security vulnerability in wolfSSL and wolfCrypt versions 4.1.0 and earlier, previously known as CyaSSL.

What is CVE-2019-14317?

The versions 4.1.0 and older of wolfSSL and wolfCrypt have a vulnerability that results in the generation of biased DSA nonces. An attacker can exploit this to compute the long-term private key remotely.

The Impact of CVE-2019-14317

The vulnerability allows an attacker to use a lattice attack to derive the long-term private key based on several hundred DSA signatures.

Technical Details of CVE-2019-14317

This section provides more technical insights into the CVE.

Vulnerability Description

wolfSSL and wolfCrypt 4.1.0 and earlier generate biased DSA nonces, enabling a remote attacker to compute the long-term private key through a lattice attack.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: 4.1.0 and older

Exploitation Mechanism

The issue arises due to a fix in dsa.c that alters two bits of the nonces generated.

Mitigation and Prevention

Protecting systems from this vulnerability is crucial.

Immediate Steps to Take

Update wolfSSL and wolfCrypt to versions beyond 4.1.0 to mitigate the vulnerability.
Monitor for any unusual activity that could indicate exploitation of the DSA nonce bias.

Long-Term Security Practices

Regularly update software and libraries to the latest versions to address known vulnerabilities.
Implement strong cryptographic practices to enhance overall security.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by wolfSSL and wolfCrypt to address vulnerabilities.