CVE-2009-0833 in Gen Msn
Summary
by MITRE
Heap-based buffer overflow in gen_msn.dll in the gen_msn plugin 0.31 for Winamp 5.541 allows remote attackers to execute arbitrary code via a playlist (.pls) file with a long URL in the File1 field. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 11/21/2024
The vulnerability identified as CVE-2009-0833 represents a critical heap-based buffer overflow affecting the gen_msn.dll plugin version 0.31 within Winamp 5.541 media player software. This flaw exists within the handling of playlist files, specifically targeting the .pls format which is commonly used for organizing and streaming audio content. The vulnerability stems from inadequate input validation mechanisms within the plugin's processing of the File1 field within playlist structures, creating an exploitable condition that can be triggered through maliciously crafted playlist files.
The technical implementation of this vulnerability involves the manipulation of memory allocation patterns within the heap memory structure of the Winamp application. When the gen_msn plugin processes a playlist file containing an excessively long URL within the File1 field, it fails to properly validate the input length before attempting to copy the data into a fixed-size buffer. This oversight allows attackers to overwrite adjacent memory locations, potentially corrupting the heap structure and enabling arbitrary code execution. The vulnerability operates at the application level where the plugin's memory management routines do not enforce proper bounds checking, creating a pathway for attackers to manipulate the program's execution flow through carefully constructed input data.
The operational impact of this vulnerability extends beyond simple code execution capabilities, as it provides attackers with a means to gain unauthorized control over affected systems running vulnerable versions of Winamp. Remote exploitation becomes possible since attackers can craft malicious .pls playlist files and distribute them through various channels including email attachments, web downloads, or compromised websites. Once executed, the malicious playlist would trigger the buffer overflow condition when the vulnerable plugin processes the File1 field, potentially allowing attackers to execute malicious payloads with the privileges of the compromised user. This represents a significant risk in environments where users might unknowingly download and open playlist files from untrusted sources.
Security professionals should note that this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The exploitability of this condition is further enhanced by the fact that it operates within a widely used media player application, increasing the potential attack surface. From an attacker perspective, this vulnerability maps to several ATT&CK techniques including T1059 for command and script execution, and T1203 for exploitation for privilege escalation. The vulnerability demonstrates the importance of input validation and memory safety practices in application development, particularly for plugins that process external data formats. Organizations should implement immediate mitigations through patch management to upgrade to versions of Winamp that contain fixed plugin implementations, and consider network segmentation to limit exposure to potentially malicious content. Additionally, user education regarding the risks of opening playlist files from untrusted sources remains crucial in reducing exploitation success rates.