Heap-based Buffer Overflow in MediaInfoLib LXF Parsing

Executive Summary

This vulnerability is a heap-based buffer overflow in the LXF parsing functionality of MediaInfoLib version 26.01. It occurs when the software tries to merge two audio channels into one during the parsing of a specially crafted .lxf file.

A copy-paste bug causes both audio channels to point to the same buffer, which leads to incorrect data handling. Specifically, a variable called Minimum, which tracks the minimum audio bytes to merge, can underflow due to user-controlled input. This underflow causes an infinite loop and eventually a heap buffer overflow.

The overflow can overwrite critical memory, including the BitDepth variable, allowing an attacker to bypass crash conditions and potentially execute arbitrary code remotely.

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Detection Guidance

This vulnerability is triggered by processing a specially crafted .lxf file with MediaInfoLib version 26.01. Detection involves monitoring for attempts to parse suspicious or malformed .lxf files that could exploit the heap-based buffer overflow.

Since the issue arises during the parsing of .lxf files, one approach is to scan files for unusual or malformed .lxf content before processing.

There are no specific commands provided in the available resources to detect this vulnerability directly on a system or network.

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Impact Analysis

This vulnerability can have serious impacts including the potential for remote code execution. An attacker can exploit the heap buffer overflow to overwrite critical memory and execute arbitrary code on the affected system.

Because the vulnerability can be triggered by a specially crafted .lxf file, simply processing or opening such a file with the vulnerable MediaInfoLib version could compromise the system.

The CVSSv3 score of 7.8 indicates a high severity level, meaning the impact on confidentiality, integrity, and availability is significant.

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Compliance Impact

The provided information does not specify how this vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

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Mitigation Strategies

To mitigate this vulnerability, avoid processing untrusted or suspicious .lxf files with MediaInfoLib version 26.01.

Since the vulnerability allows arbitrary code execution via crafted .lxf files, restricting or validating input files before parsing is critical.

Applying any available patches or updates from the vendor that address this heap-based buffer overflow is recommended once they become available.

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