CVE-2001-0541 in Windows Media Player
Summary
by MITRE
Buffer overflow in Microsoft Windows Media Player 7.1 and earlier allows remote attackers to execute arbitrary commands via a malformed Windows Media Station (.NSC) file.
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Analysis
by VulDB Data Team • 05/21/2019
The vulnerability identified as CVE-2001-0541 represents a critical buffer overflow flaw within Microsoft Windows Media Player version 7.1 and earlier installations. This security weakness specifically manifests when the media player processes malformed Windows Media Station (.NSC) files, which are used to store configuration information for Windows Media streaming services. The buffer overflow occurs during the parsing of these .NSC files, where insufficient input validation allows attackers to craft specially formatted files that exceed the allocated buffer space, thereby corrupting adjacent memory regions.
The technical exploitation of this vulnerability leverages the inherent memory management flaws in the Windows Media Player application's handling of media station configuration data. When a user opens or previews a maliciously crafted .NSC file, the application fails to properly bounds-check the data being read into memory buffers, allowing an attacker to overwrite critical memory locations including return addresses and function pointers. This memory corruption enables arbitrary code execution with the privileges of the user running the vulnerable software, potentially leading to complete system compromise. The flaw aligns with CWE-121, which categorizes heap-based buffer overflows as a fundamental weakness in memory management, and demonstrates how improper input validation can lead to privilege escalation and remote code execution.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it provides remote attackers with the capability to execute arbitrary commands on affected systems. Attackers can distribute malicious .NSC files through various vectors including email attachments, compromised websites, or peer-to-peer networks, making the attack surface particularly broad. Once executed, the malicious code could establish backdoors, download additional malware, or perform other malicious activities without user interaction beyond opening the compromised file. This vulnerability directly maps to ATT&CK technique T1203, which covers exploitation of remote services, and T1059, covering command and scripting interpreters, as the successful exploitation enables attackers to execute arbitrary code within the target environment.
Mitigation strategies for CVE-2001-0541 primarily focus on immediate software updates and system hardening measures. Microsoft released security patches for Windows Media Player 8 and later versions that addressed this buffer overflow vulnerability through improved input validation and memory management practices. Organizations should prioritize immediate patch deployment across all affected systems, particularly those running Windows Media Player 7.1 or earlier versions. Additional protective measures include implementing application whitelisting policies to restrict execution of untrusted .NSC files, disabling automatic preview of media files in web browsers, and configuring network firewalls to block unnecessary media streaming protocols. The vulnerability also highlights the importance of input validation and memory safety practices, aligning with industry standards such as the CERT/CC secure coding guidelines and emphasizing the need for robust buffer management in multimedia applications. System administrators should also consider implementing intrusion detection systems to monitor for suspicious .NSC file access patterns and maintain comprehensive security monitoring to detect potential exploitation attempts.