CVE-2019-3832 in libsndfile
Summary
by MITRE
It was discovered the fix for CVE-2018-19758 (libsndfile) was not complete and still allows a read beyond the limits of a buffer in wav_write_header() function in wav.c. A local attacker may use this flaw to make the application crash.
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Analysis
by VulDB Data Team • 08/03/2023
The vulnerability identified as CVE-2019-3832 represents a critical buffer overread flaw in the libsndfile library, specifically within the wav_write_header() function located in the wav.c source file. This issue emerged as a continuation of the previously addressed CVE-2018-19758, where developers had implemented an incomplete fix that failed to fully resolve the underlying buffer management problem. The flaw manifests when processing WAV audio files, creating a scenario where the application attempts to read data beyond the allocated buffer boundaries during header writing operations. This type of vulnerability falls under the CWE-125 weakness category, which specifically addresses out-of-bounds read conditions that can lead to arbitrary code execution or system instability.
The technical implementation of this vulnerability exploits the insufficient bounds checking within the wav_write_header() function, where the library fails to properly validate input parameters before performing memory operations. When an attacker crafts a malicious WAV file with malformed header data, the library's insufficient validation allows the program to access memory locations beyond the intended buffer limits. This behavior directly aligns with ATT&CK technique T1203, which describes the use of input validation flaws to achieve unauthorized access or system compromise. The vulnerability specifically affects applications that utilize libsndfile for audio file processing, including media players, audio editing software, and various multimedia applications that depend on this widely-used audio library for handling WAV format files.
The operational impact of CVE-2019-3832 extends beyond simple application crashes, as it represents a potential vector for more severe security consequences. Local attackers can leverage this flaw to cause denial of service conditions, potentially disrupting audio processing workflows in critical applications. The vulnerability's exploitation requires minimal privileges since it operates within the context of the application itself, making it particularly dangerous in environments where audio processing applications run with elevated permissions or handle sensitive data. Organizations using affected software may experience unexpected application termination, data corruption, or in more sophisticated attack scenarios, potential privilege escalation opportunities. The flaw's persistence in the codebase despite previous remediation efforts highlights the importance of thorough testing and validation of security patches, particularly in widely-deployed libraries that serve as foundational components for numerous applications.
Mitigation strategies for CVE-2019-3832 require immediate attention from system administrators and software maintainers who rely on libsndfile for audio processing tasks. The most effective approach involves updating to the latest version of libsndfile where the vulnerability has been properly addressed through comprehensive bounds checking and input validation. Organizations should conduct immediate vulnerability assessments to identify all systems running affected versions of the library and prioritize patch deployment across their infrastructure. Additionally, implementing network segmentation and access controls can limit the potential impact of exploitation attempts, while application sandboxing and privilege separation can reduce the attack surface. Security monitoring should be enhanced to detect anomalous behavior patterns that might indicate exploitation attempts, particularly in systems handling audio file processing. The vulnerability underscores the critical importance of maintaining up-to-date software libraries and implementing robust security testing procedures that include thorough code review and automated vulnerability scanning to prevent similar issues from persisting in future releases.