CVE-2019-6978 : Security Advisory and Response

A double free vulnerability has been discovered in versions 2.2.5 of the GD Graphics Library, also known as LibGD. This vulnerability exists in the gdImage*Ptr() functions found in gd_gif_out.c, gd_jpeg.c, and gd_wbmp.c. It is important to note that PHP remains unaffected by this vulnerability.

Understanding CVE-2019-6978

This CVE entry describes a specific vulnerability in the GD Graphics Library.

What is CVE-2019-6978?

The CVE-2019-6978 vulnerability is a double free issue present in versions 2.2.5 of the GD Graphics Library. It affects the gdImage*Ptr() functions in gd_gif_out.c, gd_jpeg.c, and gd_wbmp.c. Notably, PHP is not impacted by this vulnerability.

The Impact of CVE-2019-6978

This vulnerability could potentially be exploited by attackers to execute arbitrary code or cause a denial of service (DoS) on systems using the affected versions of the GD Graphics Library.

Technical Details of CVE-2019-6978

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

Vulnerability Description

The double free vulnerability in the GD Graphics Library's gdImage*Ptr() functions allows attackers to manipulate memory and potentially execute malicious code.

Affected Systems and Versions

Affected Version: 2.2.5 of the GD Graphics Library (LibGD)
Unaffected Systems: PHP

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting specific inputs to trigger the double free condition, leading to potential code execution or DoS.

Mitigation and Prevention

Protecting systems from CVE-2019-6978 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the GD Graphics Library to a patched version that addresses the double free vulnerability.
Monitor for any unusual activities on systems that could indicate exploitation.

Long-Term Security Practices

Regularly update software and libraries to patch known vulnerabilities.
Implement strong input validation mechanisms to prevent exploitation of memory-related vulnerabilities.

Patching and Updates

Ensure that all systems using the GD Graphics Library are updated to a version that includes a fix for the double free vulnerability.