CVE-2022-38865 in MPlayer
Summary
by MITRE • 09/15/2022
Certain The MPlayer Project products are vulnerable to Divide By Zero via the function demux_avi_read_packet of libmpdemux/demux_avi.c. This affects mplyer SVN-r38374-13.0.1 and mencoder SVN-r38374-13.0.1.
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Analysis
by VulDB Data Team • 10/18/2022
The vulnerability identified as CVE-2022-38865 represents a critical divide-by-zero error within the MPlayer media processing framework, specifically within the demux_avi_read_packet function located in libmpdemux/demux_avi.c. This flaw exists in MPlayer SVN-r38374-13.0.1 and MEncoder SVN-r38374-13.0.1 versions, making them susceptible to denial-of-service conditions and potential code execution. The issue stems from improper input validation during AVI file parsing operations, where the software fails to properly handle malformed or specially crafted AVI container structures that contain zero values in critical mathematical operations. Such vulnerabilities fall under CWE-369, which categorizes divide-by-zero errors as a fundamental flaw in input validation and error handling mechanisms. The vulnerability operates at the intersection of software security and multimedia processing, where legitimate media files can be manipulated to trigger arithmetic exceptions during demultiplexing operations.
The technical implementation of this vulnerability occurs when the demux_avi_read_packet function processes AVI file headers and packet structures without adequate validation of denominator values used in mathematical computations. When an attacker crafts an AVI file containing a zero value in a field that will be used as a divisor during packet size calculations or frame rate computations, the software will attempt to execute a division operation by zero, resulting in immediate program termination or system instability. This type of error condition can be exploited through various attack vectors including email attachments, web downloads, or streaming media content that utilizes the affected MPlayer components. The operational impact extends beyond simple denial-of-service as the divide-by-zero condition can potentially corrupt memory structures or trigger cascading failures within the media processing pipeline, making it particularly dangerous in environments where automated media processing is common. According to ATT&CK framework domain T1203, this vulnerability aligns with the "Exploitation for Client Execution" technique where attackers leverage application flaws to execute malicious code or cause system instability.
The security implications of CVE-2022-38865 are significant for organizations relying on MPlayer for media processing, particularly in environments where untrusted media files are processed automatically or where users can upload media content. The vulnerability affects both MPlayer and MEncoder components, indicating a systemic issue within the AVI demultiplexing library that could potentially impact other multimedia applications built on similar codebases. Attackers can exploit this vulnerability by creating malicious AVI files that contain crafted header structures designed to trigger the divide-by-zero condition when processed by the affected software. The lack of proper error handling and input validation in the demux_avi_read_packet function creates an attack surface where a single malformed packet can cause complete application failure, making this vulnerability particularly attractive to threat actors seeking to disrupt media processing services or establish persistent access through more sophisticated attacks. Organizations should consider implementing strict input validation policies and regular security updates as mitigation strategies.
Mitigation efforts for CVE-2022-38865 should focus on immediate software updates from The MPlayer Project to address the divide-by-zero condition in the demux_avi_read_packet function. System administrators should implement network-level controls to filter or quarantine AVI files from untrusted sources, particularly in environments where automatic media processing occurs. The vulnerability can be addressed through defensive programming techniques including explicit zero-value checks before mathematical operations, proper error handling mechanisms, and input sanitization routines that validate AVI file structures prior to processing. Additionally, organizations should consider implementing sandboxed environments for media processing operations to contain potential exploitation attempts and establish monitoring protocols to detect abnormal application behavior that may indicate exploitation attempts. Security teams should also review their incident response procedures to ensure readiness for handling media processing vulnerabilities and implement regular vulnerability assessments targeting multimedia processing libraries and frameworks. The remediation process should include comprehensive testing to verify that the patched version properly handles malformed AVI files without triggering arithmetic exceptions while maintaining full compatibility with legitimate media content.