CVE-2005-4790 in Linux
Summary
by MITRE
Multiple untrusted search path vulnerabilities in SUSE Linux 9.3 and 10.0, and possibly other distributions, cause the working directory to be added to LD_LIBRARY_PATH, which might allow local users to execute arbitrary code via (1) beagle, (2) tomboy, or (3) blam. NOTE: in August 2007, the tomboy vector was reported for other distributions.
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Analysis
by VulDB Data Team • 07/07/2021
This vulnerability represents a critical untrusted search path issue affecting multiple desktop applications in SUSE Linux distributions. The core flaw occurs when applications fail to properly validate library paths, causing the system to automatically append the current working directory to the LD_LIBRARY_PATH environment variable. This behavior creates a privilege escalation vector where local attackers can manipulate the library loading process to execute malicious code with elevated privileges. The vulnerability specifically impacts three applications: beagle, tomboy, and blam, each of which demonstrates the same fundamental flaw in their library resolution mechanisms. The issue stems from the applications' failure to sanitize environment variables before executing system calls, creating a dangerous condition where arbitrary libraries can be loaded from the current working directory.
The technical exploitation of this vulnerability follows a well-documented pattern that aligns with CWE-426 and CWE-74 standards for untrusted search path vulnerabilities. Attackers can place malicious shared libraries with the same names as legitimate system libraries in the current working directory of targeted applications. When these applications execute, they load the attacker-controlled libraries instead of the intended system libraries, effectively executing arbitrary code within the context of the target application. This vulnerability operates at the operating system level and leverages the dynamic linking mechanism that is fundamental to Unix-like systems. The attack requires local access to the system but can result in privilege escalation depending on how the target applications are configured and executed. The vulnerability's persistence across multiple SUSE versions indicates a systemic flaw in the distribution's package management and application security hardening practices.
The operational impact of this vulnerability extends beyond simple code execution to encompass potential system compromise and data exposure. Applications like beagle, which provide desktop search functionality, and tomboy, which offers note-taking capabilities, often run with elevated privileges or have access to user data. When exploited, these applications can provide attackers with persistent access to the system and potentially access to sensitive user information. The vulnerability also demonstrates the broader issue of application security in desktop environments where user interaction with potentially malicious files can lead to system compromise. The fact that this vulnerability was reported for other distributions in 2007 indicates that it represents a widespread problem in the Linux desktop ecosystem, affecting multiple vendors and applications. The vulnerability's impact is particularly concerning because it can be exploited without requiring network access or specialized tools, making it a significant threat to desktop system security.
Mitigation strategies for this vulnerability must address both the immediate exploitation vectors and the underlying architectural issues. The primary defense involves ensuring that applications properly sanitize environment variables before executing system calls, specifically by avoiding the inclusion of current working directories in library search paths. This approach aligns with the principle of least privilege and follows recommended practices for secure coding in Unix-like environments. System administrators should implement proper file permissions and directory access controls to prevent unauthorized library placement in application working directories. Additionally, the use of secure library loading mechanisms such as explicit library path specification and runtime environment sanitization can prevent the exploitation of these vulnerabilities. The vulnerability also highlights the importance of application security reviews and the implementation of security testing procedures during software development. Regular updates and patches to address these issues are essential, as the vulnerability represents a persistent risk that can be exploited by local attackers with minimal technical expertise. The mitigation approach should also include monitoring for suspicious library loading activities and implementing proper application sandboxing to limit the potential impact of successful exploitation attempts.