CVE-2022-38862 in MPlayer
Summary
by MITRE • 09/15/2022
Certain The MPlayer Project products are vulnerable to Buffer Overflow via function play() of libaf/af.c:639. This affects mplayer 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-2022-38862 represents a critical buffer overflow condition within The MPlayer Project multimedia applications, specifically affecting the mplayer and mencoder utilities. This flaw exists within the audio filtering component of the software, where the play() function in the libaf/af.c file at line 639 fails to properly validate input data lengths before processing. The affected versions include mplayer SVN-r38374-13.0.1 and mencoder SVN-r38374-13.0.1, indicating this vulnerability has been present in recent development builds of these widely-used media processing tools. The buffer overflow condition occurs when the application processes specially crafted audio files that contain malformed data structures, allowing attackers to overwrite adjacent memory regions beyond the allocated buffer boundaries.
The technical exploitation of this vulnerability stems from inadequate bounds checking within the audio filtering subsystem of MPlayer. When the play() function processes audio data, it does not sufficiently validate the size of incoming data segments, particularly when handling specific audio format configurations. This allows an attacker to craft malicious audio files that, when processed by the vulnerable mplayer or mencoder applications, trigger memory corruption. The flaw manifests as a classic stack-based buffer overflow where the excessive data input overflows the allocated buffer space, potentially overwriting critical program variables, return addresses, or other memory structures. This condition creates opportunities for arbitrary code execution, as attackers can manipulate the program flow by overwriting the return address on the stack, effectively redirecting execution to malicious code placed in memory.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it provides a pathway for remote code execution on systems running vulnerable versions of MPlayer. Attackers exploiting this flaw could potentially execute arbitrary commands with the privileges of the user running the media player, which could lead to complete system compromise. The vulnerability is particularly concerning because MPlayer is widely distributed and used across multiple operating systems, including Linux, Windows, and macOS, amplifying the potential attack surface. Systems that automatically process or play media files from untrusted sources, such as web browsers, media centers, or automated content processing systems, become prime targets for exploitation. The vulnerability's presence in both mplayer and mencoder components means that attackers could potentially leverage it through various attack vectors, including web-based media delivery, email attachments, or file sharing networks.
Organizations and users should immediately implement mitigation strategies to address this vulnerability, beginning with updating to the latest stable versions of MPlayer where the buffer overflow has been patched. The CWE-121 category classification indicates this vulnerability falls under stack-based buffer overflow conditions, which are among the most dangerous types of memory corruption vulnerabilities. Security professionals should also consider implementing network segmentation and access controls to limit exposure, particularly in environments where users might encounter untrusted media content. Additionally, deploying application whitelisting policies that restrict execution of vulnerable versions of MPlayer and mencoder can provide an additional layer of protection. The ATT&CK framework's T1059.007 technique for 'Command and Scripting Interpreter: PowerShell' and T1203 'Exploitation for Client Execution' could be relevant in threat modeling for potential exploitation scenarios. Regular security audits and vulnerability assessments should be conducted to identify any systems running outdated versions, as the vulnerability's exploitation potential remains significant until proper patches are applied and verified across all affected deployments.