CVE-2010-3385 in TuxGuitar
Summary
by MITRE
TuxGuitar 1.2 places a zero-length directory name in the LD_LIBRARY_PATH, which allows local users to gain privileges via a Trojan horse shared library in the current working directory.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 09/27/2021
The vulnerability identified as CVE-2010-3385 affects TuxGuitar version 1.2 and represents a classic privilege escalation flaw stemming from improper handling of the dynamic library loading mechanism. This vulnerability resides in the application's execution environment where it manipulates the LD_LIBRARY_PATH variable by incorporating a zero-length directory name. The presence of such a directory in the library search path creates an exploitable condition that adversaries can leverage to execute malicious code with elevated privileges.
The technical root cause of this vulnerability aligns with CWE-426, which addresses the insecure handling of the library search path. When TuxGuitar processes the LD_LIBRARY_PATH environment variable, it includes a zero-length directory entry that effectively translates to the current working directory. This design flaw enables attackers to place malicious shared libraries in the current directory from which the application executes, bypassing normal security restrictions that would otherwise prevent loading unauthorized code. The vulnerability operates under the principle that the dynamic linker searches directories in the order specified by LD_LIBRARY_PATH, and a zero-length entry in this path allows the linker to search the current directory as the first location for library resolution.
From an operational perspective, this vulnerability creates a significant risk for local users who execute TuxGuitar with elevated privileges or in environments where the application may be run by users with higher permissions. The attack vector requires local access to the system and involves placing a malicious shared library in the directory where TuxGuitar is executed. This scenario commonly occurs when users run applications from untrusted directories or when applications are executed with elevated privileges in potentially compromised environments. The privilege escalation occurs because the malicious library is loaded in the context of the TuxGuitar process, potentially allowing the attacker to execute code with the same privileges as the target application, which could include root or administrative rights.
The impact of this vulnerability extends beyond simple privilege escalation to encompass broader security implications in system integrity and access control. According to ATT&CK framework concept T1548.001, this vulnerability enables privilege escalation through the use of dynamic-link library (DLL) injection techniques. The attack effectively allows adversaries to manipulate the execution flow of legitimate applications by inserting malicious code into the library loading sequence. Organizations should consider this vulnerability as part of their broader security posture assessment, particularly in environments where users may execute applications from untrusted directories or where applications are run with elevated privileges. The vulnerability also demonstrates the importance of proper environment variable handling and the need for applications to sanitize or validate environment variables before using them in critical system operations.
Mitigation strategies should focus on both immediate remediation and long-term architectural improvements. The primary fix involves updating TuxGuitar to a version that properly handles the LD_LIBRARY_PATH environment variable without including zero-length directory entries. System administrators should also implement proper access controls to limit where users can execute applications and ensure that applications are not run with unnecessary elevated privileges. Additional protective measures include implementing secure coding practices that validate environment variables and using tools like auditd or similar monitoring systems to detect suspicious library loading activities. Organizations should also consider implementing application whitelisting policies that restrict which applications can be executed in privileged contexts, thereby reducing the attack surface for such vulnerabilities. The vulnerability serves as a reminder of the critical importance of secure coding practices in preventing exploitation of dynamic library loading mechanisms, and demonstrates how seemingly minor implementation flaws can result in significant security implications.