CVE-2019-12218 : Security Advisory and Response

An issue has been identified in a library called libSDL2.a within Simple DirectMedia Layer (SDL) version 2.0.9. This vulnerability occurs when libSDL2.a is used alongside libSDL2_image.a in version 2.0.4 of SDL2_image, specifically in the function IMG_LoadPCX_RW in IMG_pcx.c, leading to a NULL pointer dereference.

Understanding CVE-2019-12218

This CVE pertains to a vulnerability in the SDL library that can be exploited when certain functions are called in conjunction with specific versions of related libraries.

What is CVE-2019-12218?

CVE-2019-12218 is a security vulnerability found in the SDL library versions 2.0.9 and SDL2_image version 2.0.4. The vulnerability arises due to a NULL pointer dereference in the function IMG_LoadPCX_RW in IMG_pcx.c.

The Impact of CVE-2019-12218

The exploitation of this vulnerability could lead to a denial of service (DoS) condition or potentially allow an attacker to execute arbitrary code on the affected system.

Technical Details of CVE-2019-12218

This section provides more in-depth technical details regarding the vulnerability.

Vulnerability Description

The vulnerability lies in the function IMG_LoadPCX_RW in IMG_pcx.c, where improper handling of NULL pointers can result in a crash or potential code execution.

Affected Systems and Versions

Simple DirectMedia Layer (SDL) version 2.0.9
SDL2_image version 2.0.4

Exploitation Mechanism

The vulnerability can be exploited by crafting a malicious PCX image file and tricking a user or application into loading it using the vulnerable function IMG_LoadPCX_RW.

Mitigation and Prevention

To address CVE-2019-12218, follow these mitigation strategies:

Immediate Steps to Take

Update SDL and SDL2_image to the latest patched versions.
Avoid loading untrusted or unknown PCX image files.

Long-Term Security Practices

Regularly monitor for security advisories related to SDL and its associated libraries.
Implement secure coding practices to prevent NULL pointer dereference vulnerabilities.

Patching and Updates

Apply patches provided by SDL and SDL2_image maintainers to fix the vulnerability.