CVE-2022-40438 in Bento4
Summary
by MITRE • 09/15/2022
Buffer overflow vulnerability in function AP4_MemoryByteStream::WritePartial in mp42aac in Bento4 v1.6.0-639, allows attackers to cause a denial of service via a crafted file.
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Analysis
by VulDB Data Team • 10/18/2022
The buffer overflow vulnerability identified as CVE-2022-40438 resides within the AP4_MemoryByteStream::WritePartial function of the Bento4 library version 1.6.0-639. This flaw manifests in the mp42aac component which processes mp4 files for audio conversion. The vulnerability stems from inadequate bounds checking during memory operations when handling crafted input files, creating a condition where attacker-controlled data can overwrite adjacent memory locations beyond the allocated buffer boundaries. The Bento4 library serves as a comprehensive multimedia framework for manipulating mp4 files and is widely utilized in digital media processing workflows across various platforms and applications. This particular vulnerability represents a classic buffer overflow scenario where the WritePartial function fails to validate the length of data being written to a memory buffer, potentially allowing malicious input to corrupt program execution flow or cause unexpected behavior.
The technical exploitation of this vulnerability occurs when a maliciously crafted mp4 file is processed by software utilizing the vulnerable Bento4 library. The AP4_MemoryByteStream::WritePartial function receives input data without proper validation of buffer limits, enabling attackers to supply data exceeding the allocated memory space. This condition creates a memory corruption scenario that can result in program termination, arbitrary code execution, or system instability. The vulnerability is particularly concerning as it operates at the memory management level within a widely used multimedia processing library, potentially affecting numerous applications that depend on Bento4 for mp4 file handling and conversion. The attack surface expands significantly since mp4 files are ubiquitous across digital media platforms, making this a high-impact vulnerability for systems processing user-uploaded content or third-party media files. According to CWE classification, this vulnerability maps to CWE-121: Stack-based Buffer Overflow, which represents a fundamental memory safety issue where insufficient bounds checking allows buffer overflows to occur.
The operational impact of CVE-2022-40438 extends beyond simple denial of service conditions to potentially enable more sophisticated attacks depending on the target system architecture and memory protection mechanisms in place. When exploited successfully, this buffer overflow can cause applications using the vulnerable library to crash or terminate unexpectedly, leading to denial of service for legitimate users. In environments where automatic recovery mechanisms are not implemented, this can result in prolonged service unavailability. The vulnerability's exploitation requires minimal privileges since it operates within the application's own memory space, making it particularly dangerous for server applications and media processing systems that handle untrusted input files. Organizations using Bento4 in their media processing pipelines face significant risk as attackers can craft mp4 files designed to trigger this specific vulnerability, potentially causing cascading failures in media processing workflows. The vulnerability also aligns with ATT&CK technique T1203: Exploitation for Client Execution, where adversaries leverage software vulnerabilities to execute malicious code or cause system instability.
Mitigation strategies for CVE-2022-40438 should prioritize immediate software updates to versions that have patched the buffer overflow condition in the AP4_MemoryByteStream::WritePartial function. Organizations must conduct comprehensive vulnerability assessments to identify all systems utilizing affected Bento4 library versions and implement remediation measures accordingly. Input validation controls should be enhanced to include bounds checking for all memory operations, particularly when handling external or untrusted file inputs. Additionally, implementing memory protection mechanisms such as stack canaries, address space layout randomization, and data execution prevention can provide additional defense-in-depth layers against exploitation attempts. System administrators should also monitor for suspicious file processing activities and implement proper logging of media file handling operations to detect potential exploitation attempts. The vulnerability highlights the importance of maintaining up-to-date multimedia processing libraries and implementing robust input sanitization practices in applications that process user-provided media content, as this represents a critical security gap that can be exploited to compromise system availability and potentially execute unauthorized code.