CVE-2019-20792 : Vulnerability Insights and Analysis

OpenSC before version 0.20.0 is vulnerable to a double free flaw in the coolkey_free_private_data function due to a missing uniqueness check in the coolkey_add_object function.

Understanding CVE-2019-20792

OpenSC is susceptible to a double free vulnerability, potentially leading to exploitation by attackers.

What is CVE-2019-20792?

The vulnerability in OpenSC before version 0.20.0 allows for a double free issue in the coolkey_free_private_data function, caused by the absence of a uniqueness check in the coolkey_add_object function.

The Impact of CVE-2019-20792

This vulnerability could be exploited by malicious actors to execute arbitrary code or cause a denial of service (DoS) condition on affected systems.

Technical Details of CVE-2019-20792

OpenSC's vulnerability details and affected systems.

Vulnerability Description

The vulnerability arises from a double free in the coolkey_free_private_data function due to the lack of a uniqueness check in the coolkey_add_object function within the libopensc/card-coolkey.c file.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: Not applicable

Exploitation Mechanism

The vulnerability can be exploited by an attacker to trigger a double free condition, potentially leading to arbitrary code execution or a DoS situation.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2019-20792.

Immediate Steps to Take

Update OpenSC to version 0.20.0 or later to address the vulnerability.
Monitor for any unusual activities on the system that could indicate exploitation.

Long-Term Security Practices

Regularly update software and firmware to the latest versions to patch known vulnerabilities.
Implement proper input validation and error checking in software development to prevent similar issues.

Patching and Updates

Apply patches provided by OpenSC promptly to fix the double free vulnerability.