CVE-2017-8362 in libsndfile
Summary
by MITRE
The flac_buffer_copy function in flac.c in libsndfile 1.0.28 allows remote attackers to cause a denial of service (invalid read and application crash) via a crafted audio file.
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Analysis
by VulDB Data Team • 12/02/2022
The vulnerability identified as CVE-2017-8362 resides within the libsndfile library version 1.0.28, specifically within the flac_buffer_copy function located in the flac.c source file. This flaw represents a classic buffer over-read condition that can be exploited by remote attackers to execute denial of service attacks against systems processing audio files. The vulnerability stems from inadequate input validation and bounds checking within the FLAC audio file parsing logic, where the function fails to properly verify the integrity of buffer boundaries during audio data copying operations.
The technical implementation of this vulnerability involves the improper handling of malformed FLAC audio files that contain crafted data structures designed to trigger invalid memory reads. When the flac_buffer_copy function processes such malicious input, it attempts to copy audio data from a source buffer to a destination buffer without sufficient validation of the source buffer size or content. This leads to reading beyond the allocated memory boundaries, resulting in application crashes and system instability. The vulnerability is classified under CWE-125 as an out-of-bounds read, which is a fundamental memory safety issue that has been consistently identified as a critical threat vector in multimedia processing libraries.
From an operational perspective, this vulnerability poses significant risks to systems that rely on libsndfile for audio file processing, including media servers, audio editing applications, and multimedia frameworks. Attackers can exploit this flaw by preparing specially crafted FLAC files that, when processed by vulnerable applications, will cause immediate application termination and system instability. The impact extends beyond simple service disruption as it can affect automated audio processing pipelines, content management systems, and any application that accepts user-uploaded audio files without proper validation. The vulnerability is particularly concerning in server environments where multiple users can upload content, as it provides an easy path for remote attackers to cause widespread service degradation.
The attack surface for CVE-2017-8362 encompasses any software that utilizes libsndfile version 1.0.28 or earlier for FLAC audio file handling, including but not limited to digital audio workstations, media streaming platforms, and audio processing frameworks. This vulnerability aligns with ATT&CK technique T1499.001 which covers network denial of service attacks, and represents a common pattern in multimedia processing libraries where insufficient input validation leads to memory corruption vulnerabilities. The exploitation requires minimal technical expertise and can be automated, making it particularly dangerous in environments where user-generated content is processed without proper sanitization.
Mitigation strategies for this vulnerability include immediate upgrading to libsndfile version 1.0.29 or later, which contains the necessary patches to address the buffer over-read condition. System administrators should also implement proper input validation and sanitization measures for all audio file processing pipelines, including the use of sandboxed environments for file processing and automated content scanning for malformed audio files. Additionally, deploying intrusion detection systems that can identify suspicious audio file patterns and implementing network segmentation to limit exposure of vulnerable services can provide additional layers of protection. Organizations should also conduct comprehensive vulnerability assessments to identify all systems utilizing affected versions of libsndfile and prioritize remediation efforts accordingly.