Buffer Overflow in GPAC via nhntdmx_process Function

Executive Summary

This is a buffer overflow vulnerability in GPAC where the nhntdmx_process() function improperly handles file paths. The issue occurs when a file path longer than 1000 bytes is processed, leading to memory corruption due to unsafe string operations like strcpy without proper bounds checking.

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Detection Guidance

To detect this vulnerability, check if your GPAC version is affected by examining the nhntdmx_process function in dmx_nhnt.c for unsafe string operations like strcpy or strcat. Use commands like 'git log --oneline' to inspect commits or 'grep -r "nhntdmx_process" /path/to/gpac/source/' to locate the function. Compare versions against the fixed commit fac50e6a12ac27ffabdd5d3080b51afcc44ad8d6.

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Impact Analysis

An attacker could exploit this to execute arbitrary code on your system if you process a malicious NHNT hint file. This could lead to system compromise, data theft, or denial of service if stack protections are disabled.

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Compliance Impact

This vulnerability could potentially affect compliance with GDPR and HIPAA by enabling arbitrary code execution through buffer overflow. If exploited, it may lead to unauthorized access, data breaches, or system compromise, violating confidentiality and integrity requirements under these regulations.

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Mitigation Strategies

Immediately update GPAC to the latest version containing the fix in commit fac50e6a12ac27ffabdd5d3080b51afcc44ad8d6. If updating is not possible, apply the patch manually by replacing strcpy with gf_strlcpy and strcat with gf_strlcat in the nhntdmx_process function. Avoid processing untrusted NHNT hint files until patched.

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