CVE-2003-0969 in mpg321
Summary
by MITRE
mpg321 0.2.10 allows remote attackers to overwrite memory and possibly execute arbitrary code via an mp3 file that passes certain strings to the printf function, possibly triggering a format string vulnerability.
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Analysis
by VulDB Data Team • 05/31/2019
The vulnerability identified as CVE-2003-0969 affects mpg321 version 0.2.10, a popular command-line mp3 player for unix-like systems. This issue represents a classic format string vulnerability that arises when the application fails to properly validate or sanitize user-supplied input before processing it through printf family functions. The flaw specifically manifests when the mp3 player encounters certain strings within mp3 files that are subsequently passed to printf without proper formatting controls, creating an opportunity for attackers to manipulate memory layout and potentially execute arbitrary code.
The technical implementation of this vulnerability stems from improper input handling within the mpg321 application's parsing routines. When processing mp3 files, the software extracts metadata or other textual information that may contain format specifiers such as %s, %d, or %x. These specifiers, when passed directly to printf without proper validation, allow attackers to craft malicious mp3 files containing specially crafted strings that can cause the printf function to read from arbitrary memory locations or write to specific memory addresses. This behavior aligns with CWE-134, which specifically addresses format string vulnerabilities where format strings are constructed from user-controlled data.
The operational impact of this vulnerability extends beyond simple memory corruption, as it provides remote attackers with the capability to execute arbitrary code on systems running vulnerable versions of mpg321. Attackers can leverage this vulnerability by creating malicious mp3 files that contain crafted format specifiers, which when processed by the vulnerable application, can lead to stack smashing, heap corruption, or direct code execution. The remote nature of this attack vector means that simply opening or playing a maliciously crafted mp3 file can compromise the target system, making this particularly dangerous in environments where users might encounter untrusted media files.
From a cybersecurity perspective, this vulnerability demonstrates the critical importance of input validation and proper string handling in multimedia applications. The attack surface is particularly concerning given that mp3 files are commonly shared and downloaded from various sources, making the exploitation vector highly accessible. Security practitioners should note that this vulnerability aligns with ATT&CK technique T1203, which covers exploitation of remote services, and T1059, which addresses command and scripting interpreters. The vulnerability also underscores the need for proper bounds checking and the use of safe string manipulation functions such as snprintf instead of sprintf, which are fundamental defensive programming practices that should be implemented across all applications handling external input.
Mitigation strategies for CVE-2003-0969 require immediate patching of affected systems with updated versions of mpg321 that properly validate and sanitize all input before processing. Organizations should also implement network segmentation and access controls to limit exposure to potentially malicious content, while monitoring for suspicious file downloads or executions. Additionally, security teams should consider implementing application whitelisting policies that restrict the execution of untrusted media players or applications that handle external input without proper sanitization. The vulnerability serves as a reminder of the critical need for regular security updates and proper input validation in all software components, particularly those handling multimedia content where user-supplied data can contain unexpected formatting characters that may trigger serious security issues.