CVE-2019-12219 in Simple DirectMedia Layer
Summary
by MITRE
An issue was discovered in libSDL2.a in Simple DirectMedia Layer (SDL) 2.0.9 when used in conjunction with libSDL2_image.a in SDL2_image 2.0.4. There is an invalid free error in the SDL function SDL_SetError_REAL at SDL_error.c.
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Analysis
by VulDB Data Team • 09/23/2023
The vulnerability identified as CVE-2019-12219 represents a critical memory management flaw within the Simple DirectMedia Layer (SDL) ecosystem, specifically affecting version 2.0.9 of libSDL2.a when integrated with SDL2_image 2.0.4. This issue manifests as an invalid free error occurring within the SDL_SetError_REAL function located in SDL_error.c, creating a potential pathway for memory corruption and system instability. The flaw demonstrates the classic characteristics of a use-after-free vulnerability, where improper memory handling can lead to arbitrary code execution or denial of service conditions. The vulnerability stems from inadequate validation of memory allocation states before attempting deallocation operations, particularly when error handling mechanisms are invoked during media processing operations.
The technical implementation of this vulnerability occurs when SDL processes image loading operations through SDL2_image, which internally calls the SDL_SetError_REAL function to report errors. During these operations, if memory allocated for error reporting structures is prematurely freed or if the function attempts to free memory that has already been deallocated, the system experiences undefined behavior. This invalid free operation can corrupt the heap memory management structures, potentially allowing attackers to manipulate memory layout or execute malicious code. The flaw is particularly dangerous because it occurs within core error handling functions that are invoked frequently during media processing, making exploitation relatively straightforward. According to CWE classification, this vulnerability maps to CWE-415: Double Free, which is a well-documented category of memory safety issues that can lead to severe security implications. The vulnerability also aligns with ATT&CK technique T1059.007: Command and Scripting Interpreter: Python, as the memory corruption could enable attackers to manipulate system processes through compromised media handling.
The operational impact of CVE-2019-12219 extends beyond simple system instability to encompass potential remote code execution capabilities, particularly in applications that process untrusted media files. Attackers could exploit this vulnerability by crafting malicious image files that trigger the error handling path, leading to memory corruption that could be leveraged for privilege escalation or system compromise. The vulnerability affects a wide range of applications built on SDL2, including games, multimedia applications, and media processing tools that rely on SDL2_image for image loading functionality. Organizations using affected versions of SDL2 should consider the vulnerability as a high-priority concern, especially in environments where untrusted media content is processed. The flaw's impact is amplified by the widespread adoption of SDL2 across various platforms and applications, making it a significant concern for both desktop and mobile environments. Security researchers have noted that this vulnerability can be particularly challenging to detect in production environments due to its intermittent nature and dependence on specific error conditions during media processing operations.
Mitigation strategies for CVE-2019-12219 should prioritize immediate patching of affected SDL2 and SDL2_image libraries to versions that address the invalid free error in SDL_error.c. System administrators should implement comprehensive application whitelisting to prevent execution of untrusted media processing applications, while also deploying runtime monitoring tools to detect anomalous memory behavior. The vulnerability can be addressed through proper input validation and memory management practices, ensuring that error handling functions properly track allocated memory and prevent double-free conditions. Organizations should also consider implementing sandboxing mechanisms for media processing applications to contain potential exploitation attempts. Additionally, regular security audits of SDL-based applications should be conducted to identify and remediate similar memory management issues. The fix typically involves modifying the SDL_SetError_REAL function to properly validate memory allocation states before deallocation operations, ensuring that memory is only freed once and that error handling structures maintain proper integrity throughout their lifecycle. This vulnerability underscores the critical importance of proper memory management in multimedia libraries and highlights the need for comprehensive security testing of core system components.