CVE-2017-8373 in MAD libmad
Summary
by MITRE
The mad_layer_III function in layer3.c in Underbit MAD libmad 0.15.1b allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted audio file.
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Analysis
by VulDB Data Team • 12/02/2022
The vulnerability identified as CVE-2017-8373 resides within the mad_layer_III function of the layer3.c file in Underbit MAD libmad version 0.15.1b, representing a critical heap-based buffer overflow that can be exploited remotely through maliciously crafted audio files. This issue affects the libmad library, which is widely used for decoding MPEG audio files across numerous applications and systems, making the vulnerability particularly dangerous due to its potential for widespread impact. The flaw manifests when the library processes specially constructed audio data that triggers an improper bounds check during the decoding of MPEG Layer III audio frames, leading to memory corruption that can result in application crashes or potentially more severe consequences.
The technical implementation of this vulnerability involves improper handling of buffer boundaries during the processing of audio frame data, specifically within the layer 3 decoding routine that handles MPEG audio compression. When an attacker supplies a crafted audio file containing malformed data structures, the mad_layer_III function fails to properly validate input parameters before performing memory operations, resulting in a heap-based buffer overflow. This condition occurs because the function does not adequately check the size of incoming data against allocated buffer space, allowing malicious input to overwrite adjacent memory regions. The vulnerability falls under CWE-121, heap-based buffer overflow, and aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as exploitation may involve manipulating audio processing pipelines to trigger the overflow condition.
The operational impact of this vulnerability extends beyond simple denial of service, as it can potentially enable more sophisticated attacks depending on the target environment and application architecture. Remote attackers can leverage this flaw to cause application crashes, leading to service disruption and potential system instability in applications that rely on libmad for audio processing. The vulnerability affects a broad spectrum of software systems including media players, streaming applications, and multimedia frameworks that utilize the libmad library for audio decoding. While the primary impact is documented as denial of service, the underlying buffer overflow condition creates potential for more severe consequences including arbitrary code execution, particularly when the affected applications run with elevated privileges or process untrusted audio content from web sources.
Mitigation strategies for CVE-2017-8373 should prioritize immediate patching of affected systems with the latest version of libmad that contains the necessary fixes for the buffer overflow vulnerability. Organizations must conduct comprehensive vulnerability assessments to identify all systems and applications utilizing the affected library version, particularly those processing untrusted audio content from external sources. Input validation mechanisms should be implemented at application layers to perform additional checks on audio file parameters before passing them to the libmad library functions. System administrators should also consider implementing network segmentation and access controls to limit exposure of vulnerable applications to untrusted network traffic, while monitoring for anomalous behavior that might indicate exploitation attempts. Additionally, application developers should ensure proper error handling and memory management practices are implemented to prevent exploitation of similar buffer overflow conditions in their own code implementations, as this vulnerability demonstrates the critical importance of robust input validation and memory boundary checking in multimedia processing libraries.