Stack-Based Buffer Overflow in ReadyMedia via Malicious DFF File

Executive Summary

This is a stack-based buffer overflow in ReadyMedia (formerly MiniDLNA) versions 1.3.0 through 1.3.3. It occurs when parsing a malicious DFF audio file with an oversized PROP chunk size. The unvalidated size leads to improper stack array allocation and memory corruption. Attackers can place the file in a monitored directory to trigger automatic parsing via inotify, causing remote code execution or denial of service.

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Detection Guidance

To detect this vulnerability, check if ReadyMedia (MiniDLNA) versions 1.3.0 through 1.3.3 are installed on your system. Use commands like 'dpkg -l | grep minidlna' or 'rpm -qa | grep minidlna' to verify the version. Monitor directories monitored by ReadyMedia for unexpected DFF files, as attackers may place malicious files there.

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Impact Analysis

An attacker could exploit this to execute arbitrary code on your device or crash it, leading to denial of service. If your device runs ReadyMedia and processes untrusted DFF files, it is at risk. Systems without stack protections may allow full remote code execution.

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Mitigation Strategies

Immediately update ReadyMedia to a patched version if available. If using ASUS RT-AX86U, apply the latest firmware update from ASUS to address this and other vulnerabilities. Disable automatic parsing of DFF files if possible, or restrict access to directories monitored by ReadyMedia.

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