CVE-2019-16058 : Security Advisory and Response

The pam_p11 component versions 0.2.0 and 0.3.0 for OpenSC have a vulnerability that could lead to a buffer overflow when a smart card generates a signature longer than 256 bytes, potentially impacting RSA keys with 4096 bits.

Understanding CVE-2019-16058

This CVE involves a security vulnerability in the pam_p11 component of OpenSC.

What is CVE-2019-16058?

CVE-2019-16058 is a vulnerability in pam_p11 versions 0.2.0 and 0.3.0 for OpenSC, where a buffer overflow can occur if a smart card generates a signature longer than 256 bytes.

The Impact of CVE-2019-16058

The vulnerability could affect RSA keys with 4096 bits and the chosen signature scheme, potentially leading to security breaches and unauthorized access.

Technical Details of CVE-2019-16058

This section provides more technical insights into the CVE.

Vulnerability Description

The issue arises when a smart card creates a signature exceeding 256 bytes, triggering a buffer overflow, particularly concerning RSA keys with 4096 bits.

Affected Systems and Versions

Component: pam_p11
Versions: 0.2.0 and 0.3.0

Exploitation Mechanism

The vulnerability is exploited when a smart card generates a signature longer than 256 bytes, potentially compromising the security of RSA keys with 4096 bits.

Mitigation and Prevention

Protect your systems from the CVE-2019-16058 vulnerability with the following steps:

Immediate Steps to Take

Update to the latest version of pam_p11 to patch the vulnerability.
Monitor for any unusual activities related to smart card signatures.

Long-Term Security Practices

Regularly update and patch all software components to prevent vulnerabilities.
Implement strict access controls and monitoring mechanisms to detect and prevent buffer overflow attacks.

Patching and Updates

Apply the patch provided by OpenSC for pam_p11 to address the buffer overflow vulnerability.