CVE-2009-4549 in A2 Media Player Pro
Summary
by MITRE
Stack-based buffer overflow in A2 Media Player Pro 2.51 allows remote attackers to execute arbitrary code via a long string in a (1) .m3u or (2) .m3l playlist file.
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Analysis
by VulDB Data Team • 12/08/2024
The vulnerability identified as CVE-2009-4549 represents a critical stack-based buffer overflow flaw within A2 Media Player Pro version 2.51, specifically affecting the handling of playlist files with extensions .m3u and .m3l. This vulnerability resides in the media player's playlist parsing functionality, where the application fails to properly validate the length of input strings when processing these file formats. The flaw occurs during the parsing of playlist entries, where maliciously crafted long strings can overflow the allocated stack buffer, potentially leading to arbitrary code execution. The vulnerability is classified as remote because attackers can exploit it through network-delivered playlist files without requiring local system access or user interaction beyond opening the malicious file.
The technical exploitation of this vulnerability leverages fundamental buffer overflow principles where insufficient input validation allows an attacker to write beyond the bounds of allocated memory. When the media player processes a malicious .m3u or .m3l file containing an excessively long string, the application's stack-based buffer cannot accommodate the input data, causing a memory overwrite that may allow an attacker to control the program's execution flow. This type of vulnerability is particularly dangerous because it can be triggered through automated means, such as web-based attacks or email attachments, making it an attractive target for exploit development. The overflow can potentially overwrite return addresses, function pointers, or other critical stack data, enabling attackers to inject and execute malicious code with the privileges of the affected application.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a potential foothold for more sophisticated attacks within affected systems. An attacker who successfully exploits this vulnerability could gain complete control over the victim's system, potentially leading to data theft, system compromise, or use as a pivot point for attacking other networked systems. The vulnerability affects users who are unable to update their software to patched versions, particularly in enterprise environments where legacy applications may persist. Organizations relying on older media player versions face significant risk as this vulnerability can be exploited through various attack vectors including web downloads, email attachments, or network-based delivery mechanisms.
Mitigation strategies for CVE-2009-4549 should prioritize immediate software updates from the vendor to address the buffer overflow condition. System administrators should implement network segmentation and access controls to limit exposure of vulnerable systems to untrusted network traffic. Network-based intrusion detection systems should be configured to monitor for suspicious playlist file patterns that may indicate exploitation attempts. Additionally, user education regarding the dangers of opening unknown playlist files and implementing application whitelisting policies can provide defense-in-depth measures. From a compliance perspective, this vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which is categorized under the Common Weakness Enumeration framework as a critical software security flaw requiring immediate attention. The vulnerability also maps to ATT&CK technique T1059.007 Command and Scripting Interpreter: PowerShell, as attackers may use PowerShell scripts to deliver and execute malicious playlist files in targeted environments, and T1203 Exploitation for Client Execution, which covers the exploitation of client-side applications through malicious files. Organizations should also consider implementing endpoint protection solutions that can detect and block malicious playlist file content, as well as regular vulnerability scanning to identify other potentially vulnerable applications on their networks.