CVE-2004-1329 in AIX
Summary
by MITRE
Untrusted execution path vulnerability in the diag commands (1) lsmcode, (2) diag_exec, (3) invscout, and (4) invscoutd in AIX 5.1 through 5.3 allows local users to execute arbitrary programs by modifying the DIAGNOSTICS environment variable to point to a malicious Dctrl program.
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Analysis
by VulDB Data Team • 06/15/2024
This vulnerability resides in the diagnostic command execution framework of IBM AIX operating systems version 5.1 through 5.3, representing a critical untrusted execution path flaw that enables local privilege escalation. The affected commands lsmcode, diag_exec, invscout, and invscoutd all share a common weakness in their handling of the DIAGNOSTICS environment variable, which is typically used to specify diagnostic tool locations. When a local user modifies this environment variable to reference a malicious Dctrl program, the system executes the arbitrary code with elevated privileges typically reserved for diagnostic operations.
The technical implementation of this vulnerability stems from insufficient input validation and privilege escalation mechanisms within the diagnostic command processing pipeline. These commands are designed to operate with elevated privileges to perform system diagnostics, but they fail to properly validate the paths specified in the DIAGNOSTICS environment variable. This creates an execution path where user-controllable input directly influences the program execution flow, violating fundamental security principles of least privilege and input sanitization. The vulnerability manifests as a classic environment variable manipulation attack vector, where the attacker leverages the system's trust in legitimate diagnostic paths to execute unauthorized code.
The operational impact of this vulnerability extends beyond simple local privilege escalation, as it provides attackers with the ability to execute arbitrary programs with diagnostic privileges that often include access to sensitive system resources and configuration data. Attackers can exploit this weakness to gain unauthorized access to system information, modify diagnostic tool behavior, or establish persistent access mechanisms. The vulnerability affects the entire AIX 5.1 through 5.3 product line, making it particularly concerning given the widespread deployment of these older system versions in enterprise environments. This flaw aligns with CWE-78 and CWE-74 categories, specifically addressing weaknesses in shell injection and command injection where environment variables control program execution paths.
Mitigation strategies for this vulnerability require immediate implementation of system hardening measures including restricting write permissions on diagnostic command binaries, implementing proper environment variable validation, and monitoring for unauthorized modifications to critical system paths. System administrators should also consider disabling unnecessary diagnostic commands when not actively needed and implementing privilege separation mechanisms to limit the scope of potential exploitation. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques under T1068 and defense evasion through T1070, emphasizing the need for proper environment variable controls and system integrity monitoring. The vulnerability demonstrates the critical importance of validating all user-controllable inputs in privileged execution contexts and highlights the necessity of implementing proper access controls for system diagnostic functions.