CVE-2006-4254 in AIX
Summary
by MITRE
Unspecified vulnerability in setlocale in IBM AIX 5.1.0 through 5.3.0 allows local users to gain privileges via unspecified vectors.
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Analysis
by VulDB Data Team • 06/05/2024
The vulnerability identified as CVE-2006-4254 represents a critical privilege escalation flaw within the setlocale function of IBM AIX operating systems versions 5.1.0 through 5.3.0. This issue falls under the broader category of privilege escalation vulnerabilities that can be exploited by local attackers to elevate their system access rights. The setlocale function is a standard system call used to configure locale settings for applications, but in this specific implementation, it contains a flaw that can be manipulated to achieve unauthorized privilege elevation. The vulnerability's classification as unspecified means that the exact technical mechanism remains undisclosed, which is common in older vulnerabilities where detailed technical analysis was not fully documented or where such information was considered sensitive. This type of vulnerability is particularly dangerous because it operates at the system level and can be exploited by users who already have access to the system, potentially allowing them to gain administrative privileges without proper authentication.
The technical nature of this vulnerability stems from improper input validation or handling within the setlocale system call implementation. When applications invoke setlocale to modify locale settings, the underlying system code processes these requests without sufficient sanitization or privilege checks. This flaw creates a potential attack surface where malicious input can trigger unexpected behavior in the system's locale handling mechanism, leading to privilege escalation. According to CWE classification, this vulnerability aligns with CWE-20: Improper Input Validation, as the system fails to properly validate or sanitize the locale parameters passed to the setlocale function. The attack vector typically involves local users who can manipulate locale settings through various means such as environment variables, configuration files, or direct system calls, ultimately leveraging these modifications to execute privileged operations.
From an operational impact perspective, this vulnerability poses significant security risks to IBM AIX environments, particularly those running versions 5.1.0 through 5.3.0. Local users who exploit this vulnerability can potentially gain root or administrative privileges, allowing them to modify system files, install malicious software, or access sensitive data. The impact extends beyond individual system compromise, as successful exploitation could lead to broader network infiltration if the compromised system serves as a gateway to other network segments. This vulnerability particularly affects enterprise environments where multiple users have local access to systems, as it provides a low-effort method for privilege escalation that could be exploited by both malicious insiders and external attackers who have gained initial access. The operational consequences include potential data breaches, system integrity compromise, and disruption of business operations.
Organizations should implement immediate mitigation strategies to address this vulnerability, including applying the appropriate IBM AIX security patches and updates released by IBM to address the specific flaw in the setlocale implementation. System administrators should conduct thorough vulnerability assessments to identify systems running affected AIX versions and prioritize patching efforts. Additional security measures include implementing least privilege access controls, monitoring for unusual locale setting changes, and establishing robust audit trails for system calls involving locale functions. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically targeting T1068: Exploitation for Privilege Escalation, where adversaries leverage system vulnerabilities to gain elevated privileges. Organizations should also consider implementing application whitelisting policies and restricting local user access where possible to minimize the attack surface. Regular security monitoring and log analysis should include detection of suspicious locale setting modifications that could indicate exploitation attempts. Given the age of this vulnerability, organizations should also evaluate their overall system security posture and consider migrating to supported operating system versions that have addressed this and similar historical vulnerabilities.