CVE-2008-1132 in Net Activity Viewer
Summary
by MITRE
Untrusted search path vulnerability in src/mainwindow.c in Net Activity Viewer 0.2.1 allows local users with Net Activity Viewer privileges to execute arbitrary code via a malicious gksu program, which is invoked during the Restart As Root action.
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Analysis
by VulDB Data Team • 11/09/2017
The vulnerability identified as CVE-2008-1132 represents a critical untrusted search path weakness in the Net Activity Viewer 0.2.1 network monitoring tool. This flaw exists within the source code file src/mainwindow.c and specifically affects the Restart As Root functionality that is designed to elevate user privileges for enhanced network monitoring capabilities. The vulnerability stems from improper handling of system PATH variables during the execution of the gksu program, which is invoked when users attempt to restart the application with elevated privileges. This design flaw creates a dangerous condition where malicious actors can manipulate the execution environment to gain unauthorized code execution privileges.
The technical implementation of this vulnerability exploits the principle of least privilege and path resolution mechanisms within Unix-like operating systems. When users select the Restart As Root option, the application attempts to execute gksu without properly sanitizing the environment or specifying absolute paths to system utilities. This behavior aligns with CWE-426, which describes untrusted search path vulnerabilities where applications fail to properly validate or control the execution environment. The flaw enables attackers to place malicious executables in directories that appear earlier in the system PATH than the legitimate gksu binary, effectively causing the application to execute attacker-controlled code instead of the intended system utility. This represents a classic privilege escalation vector that undermines the security model of the application.
The operational impact of CVE-2008-1132 extends beyond simple code execution as it provides a pathway for local users to achieve elevated privileges within the system. Since the vulnerability requires only local access and existing Net Activity Viewer privileges, it creates a significant risk for environments where multiple users share the same system or where users may have legitimate access to the application but not to system-level privileges. The attack scenario typically involves placing a malicious gksu binary in a user-accessible directory that appears before the system's legitimate gksu in the PATH environment variable. This vulnerability directly maps to ATT&CK technique T1068, which covers the exploitation of privilege escalation vectors through untrusted search paths. The consequences include potential data compromise, system takeover, and the ability to bypass other security controls that rely on the application's proper execution environment.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and environment sanitization practices. System administrators should ensure that all applications properly specify absolute paths to system utilities rather than relying on PATH resolution. The recommended approach includes modifying the application source code to explicitly define the full path to gksu or other critical system utilities during execution. Additionally, implementing proper privilege separation and using secure coding practices such as those outlined in the Open Web Application Security Project guidelines can prevent similar issues. The vulnerability also highlights the importance of maintaining up-to-date software versions and conducting regular security assessments of network monitoring tools that may be running with elevated privileges. Organizations should consider implementing application whitelisting policies and monitoring for suspicious PATH modifications to detect potential exploitation attempts. This vulnerability demonstrates how seemingly minor implementation flaws in privilege escalation mechanisms can create significant security risks that require immediate remediation.