Heap Buffer Overflow in GPAC MP4Box

Detection Guidance

This vulnerability can be detected by analyzing MP4 files processed by GPAC/MP4Box for malformed VP codec configuration data in the stsd box, specifically looking for an unknown D0ncv box type that triggers the heap buffer overflow.

Detection can involve using AddressSanitizer or similar memory error detection tools while running MP4Box on suspicious MP4 files to identify heap-buffer-overflow writes.

A proof-of-concept (PoC) crafted MP4 file is available, which can be used to test if your system is vulnerable by attempting to process it with the affected GPAC/MP4Box versions.

Specific commands are not provided in the resources, but a typical approach would be to run MP4Box with AddressSanitizer enabled or monitor for crashes when processing untrusted MP4 files.

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Mitigation Strategies

Immediate mitigation steps include avoiding processing untrusted or suspicious MP4 files with vulnerable versions of GPAC/MP4Box.

Update GPAC/MP4Box to a version that includes the fix for this vulnerability, specifically versions including or after the fix commit 74fecde32cd477ab097f3e6db55a32b259f3313d.

If updating is not immediately possible, consider sandboxing or isolating the MP4Box process to limit the impact of a potential Denial of Service caused by the heap buffer overflow.

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Executive Summary

This vulnerability is a heap buffer overflow found in the function gf_isom_vp_config_new within the isomedia/avc_ext.c file of GPAC MP4Box version 2.4.

An attacker can exploit this flaw by supplying a specially crafted MP4 file, which causes the program to overwrite memory improperly on the heap.

This improper memory handling can lead to a Denial of Service (DoS) condition, crashing or disrupting the normal operation of the software.

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Impact Analysis

The primary impact of this vulnerability is that an attacker can cause a Denial of Service (DoS) by crashing the GPAC MP4Box application.

This means that if you use GPAC MP4Box to process MP4 files, an attacker could disrupt your service or workflow by providing a maliciously crafted MP4 file.

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Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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