Integer Overflow in FreeRDP Audio Input Redirection

Executive Summary

FreeRDP before version 3.29.0 has an integer overflow flaw in the audio input redirection channel (audin) across multiple audio backends including ALSA, sndio, WinMM, and OpenSL ES. The issue occurs when the FramesPerPacket parameter from RDP servers is not properly validated, leading to allocation size wraparound and subsequent heap-based buffer overflow or denial of service.

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Detection Guidance

Detecting this vulnerability requires checking the FreeRDP version and monitoring for suspicious activity in audio redirection channels. Update FreeRDP to version 3.29.0 or later to address the issue. Inspect network traffic for malformed RDP packets with unusually large FramesPerPacket values.

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Impact Analysis

This vulnerability could allow attackers to execute arbitrary code, crash applications, or cause denial of service by sending specially crafted audio input data through an RDP connection. Users relying on FreeRDP for remote desktop sessions may experience system instability or potential unauthorized access if the software is not updated.

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Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by enabling unauthorized data access or disclosure. A heap-based buffer overflow or denial of service in FreeRDP may lead to data breaches, compromising confidentiality of personal or health data. GDPR requires protection of personal data, while HIPAA mandates safeguards for protected health information. Exploitation could violate these requirements.

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Mitigation Strategies

Update FreeRDP to version 3.29.0 or later to address the integer overflow vulnerabilities in the audio input redirection channel.

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