CVE-2021-36414 in GPAC
Summary
by MITRE • 01/11/2022
A heab-based buffer overflow vulnerability exists in MP4Box in GPAC 1.0.1 via media.c, which allows attackers to cause a denial of service or execute arbitrary code via a crafted file.
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Analysis
by VulDB Data Team • 01/13/2022
The vulnerability identified as CVE-2021-36414 represents a critical heap-based buffer overflow flaw within the MP4Box component of the GPAC multimedia framework version 1.0.1. This issue stems from inadequate input validation and memory management practices in the media.c source file, which processes multimedia content for various digital media applications. The vulnerability specifically affects the handling of crafted media files that exploit memory allocation boundaries, creating conditions where attacker-controlled data can overwrite adjacent memory regions. Such flaws typically arise from improper bounds checking during buffer operations, particularly when processing user-supplied media content that lacks proper sanitization mechanisms. The exploitation of this vulnerability demonstrates a fundamental weakness in the software's memory safety controls, where the application fails to properly validate the size and content of incoming media data before attempting to process it within allocated memory buffers.
The technical exploitation of this buffer overflow presents significant operational risks for systems utilizing GPAC 1.0.1, as attackers can craft malicious media files that trigger the vulnerability during normal playback or processing operations. When the vulnerable software processes these crafted files, the heap corruption can lead to unpredictable behavior including application crashes, denial of service conditions, or potentially full system compromise through arbitrary code execution. The heap-based nature of the vulnerability means that the overflow occurs within dynamically allocated memory regions, making the attack surface more complex and potentially more dangerous than stack-based buffer overflows. This type of vulnerability aligns with CWE-121, which categorizes heap-based buffer overflow conditions, and represents a classic example of improper input validation leading to memory corruption. The attack vector specifically targets the media processing pipeline where the software attempts to parse and handle multimedia content without sufficient safeguards against malformed inputs.
From an operational perspective, the impact of CVE-2021-36414 extends beyond simple denial of service scenarios to encompass potential security breaches in environments where GPAC is integrated into multimedia processing workflows. Systems that automatically process user-uploaded media content, such as media servers, content management platforms, or multimedia applications, become particularly vulnerable to exploitation. The vulnerability's presence in MP4Box makes it especially concerning for applications that handle mp4 container formats, which are widely used across various digital media platforms, streaming services, and content distribution networks. Organizations utilizing affected software versions face risks including service disruption, unauthorized code execution, and potential data compromise. The vulnerability's exploitation can occur through legitimate software functionality, making detection and prevention more challenging. This aligns with ATT&CK technique T1203, which covers legitimate user execution paths that can be leveraged for privilege escalation and system compromise. The potential for remote code execution through this vulnerability means that attackers could gain persistent access to affected systems, particularly in environments where multimedia processing occurs with elevated privileges or where the software operates in trusted network zones.
The recommended mitigation strategies for CVE-2021-36414 primarily focus on immediate software updates and patch management to address the underlying heap overflow conditions. Organizations should prioritize upgrading to GPAC versions that contain fixes for this vulnerability, as the maintainers have likely implemented proper bounds checking and memory management controls. Additionally, implementing input validation measures at the application level can provide defense-in-depth protection, particularly when processing untrusted media content. Network segmentation and access controls should be enforced to limit exposure of systems running vulnerable software, while monitoring solutions can help detect anomalous processing behavior that might indicate exploitation attempts. The vulnerability highlights the importance of comprehensive memory safety practices in multimedia processing frameworks, emphasizing the need for regular security assessments and code reviews focusing on buffer management and input validation. Organizations should also consider implementing sandboxing mechanisms for media processing operations to contain potential exploitation impacts and establish incident response procedures specifically addressing multimedia processing vulnerabilities.