CVE-2021-3756 in libmysofa
Summary
by MITRE • 10/29/2021
libmysofa is vulnerable to Heap-based Buffer Overflow
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Analysis
by VulDB Data Team • 11/04/2021
The vulnerability identified as CVE-2021-3756 affects libmysofa, a library used for processing audio spatialization data in various multimedia applications. This heap-based buffer overflow represents a critical security flaw that can potentially be exploited by attackers to execute arbitrary code or cause application crashes. The vulnerability stems from improper input validation within the library's handling of audio format data, specifically when processing head-related transfer function files that are commonly used in 3D audio rendering systems. The affected library is widely utilized in audio processing pipelines across multiple operating systems and applications, making the impact of this vulnerability widespread and significant.
The technical flaw manifests when libmysofa processes malformed or oversized audio data structures that exceed the allocated memory boundaries during heap allocation. This occurs due to insufficient bounds checking in the memory management routines that handle the parsing of spatial audio data files. The vulnerability is classified under CWE-122, which specifically addresses heap-based buffer overflow conditions, where insufficient validation of memory allocation parameters allows attackers to write beyond the allocated buffer space. When exploited, this flaw can lead to memory corruption that may result in denial of service conditions or more severe exploitation outcomes depending on the execution environment and memory layout.
The operational impact of CVE-2021-3756 extends beyond simple application instability, as it can enable attackers to manipulate memory contents and potentially achieve code execution within the context of applications using the vulnerable library. This vulnerability is particularly concerning because libmysofa is integrated into numerous audio processing frameworks and multimedia applications, including game engines, audio editing software, and virtual reality platforms. The attack surface is broadened by the fact that the library is often used in conjunction with other audio processing components, creating multiple potential entry points for exploitation. Applications that process user-supplied audio files or streaming data are especially at risk, as attackers can craft malicious audio content to trigger the buffer overflow condition.
Mitigation strategies for this vulnerability should focus on immediate library updates and patches provided by the maintainers, as well as implementing input validation measures within applications that utilize libmysofa. Organizations should conduct thorough vulnerability assessments to identify all systems and applications that depend on this library, and prioritize patching efforts accordingly. The implementation of address space layout randomization and stack canaries can provide additional protection layers against exploitation attempts. Security monitoring should be enhanced to detect unusual memory access patterns or application behavior that might indicate exploitation attempts. Additionally, the vulnerability highlights the importance of proper memory management practices and input validation in audio processing libraries, aligning with ATT&CK technique T1059.007 for execution through audio processing components and T1203 for exploitation of memory corruption vulnerabilities. System administrators should also consider network segmentation and access controls to limit potential attack vectors and reduce the overall impact of successful exploitation attempts.