CVE-2022-29017 in Bento4
Summary
by MITRE • 05/16/2022
Bento4 v1.6.0.0 was discovered to contain a segmentation fault via the component /x86_64/multiarch/strlen-avx2.S.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 05/18/2022
The vulnerability identified as CVE-2022-29017 affects Bento4 version 1.6.0.0 and represents a critical segmentation fault condition that occurs within the x86_64 architecture specific implementation of the strlen function. This issue manifests in the /x86_64/multiarch/strlen-avx2.S component, which is part of the optimized string length calculation routines designed for modern processor architectures. The flaw demonstrates a classic buffer overread condition where the assembly implementation fails to properly validate input boundaries during string processing operations, leading to unpredictable memory access patterns that can result in system crashes or potential code execution exploits.
The technical implementation of this vulnerability stems from improper handling of string termination checks within the AVX2-optimized strlen function. When processing certain input patterns, the assembly code does not adequately verify that memory access operations remain within allocated bounds, particularly when dealing with aligned memory regions and vectorized operations. This condition creates a scenario where the processor attempts to read memory beyond the intended string boundaries, causing the segmentation fault that terminates the application. The vulnerability specifically impacts systems utilizing x86_64 processors with AVX2 instruction set support, making it particularly relevant in modern server and workstation environments where high-performance string operations are frequently executed.
From an operational perspective, this vulnerability poses significant risks to applications that rely on Bento4 for media processing and packaging operations. The segmentation fault can lead to complete application termination, potentially causing service disruption in media streaming platforms, content delivery networks, or digital rights management systems that depend on this library. Attackers could exploit this condition to cause denial of service attacks against services using Bento4, while the underlying memory access violation also presents potential for more sophisticated exploitation techniques that could leverage the unstable memory state for code injection or privilege escalation. The vulnerability affects systems where the library is dynamically linked and executed, particularly in environments processing untrusted media content where input validation may be insufficient.
Mitigation strategies for CVE-2022-29017 should prioritize immediate patching of affected Bento4 installations to version 1.6.0.1 or later, which contains the corrected strlen implementation. Organizations should implement comprehensive input validation measures for all media processing pipelines that utilize this library, particularly when handling externally provided content. System administrators should monitor for异常 application termination patterns and implement process monitoring to detect potential exploitation attempts. The fix addresses the underlying memory access violation by introducing proper boundary checking in the AVX2-optimized assembly code, ensuring that string length calculations respect memory limits and prevent overread conditions. Security teams should also consider implementing runtime protections such as stack canaries, address space layout randomization, and control flow integrity checks to provide additional defense in depth against potential exploitation of similar vulnerabilities in related components. This vulnerability aligns with CWE-125 Out-of-bounds Read and CWE-787 Out-of-bounds Write patterns, and may map to ATT&CK techniques involving privilege escalation and denial of service through application level exploits.