CVE-2007-4238 in AIX
Summary
by MITRE
AIX 5.2 and 5.3 install pioinit with user and group ownership of bin, which allows local users with bin or possibly printq privileges to gain root privileges by modifying pioinit.
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Analysis
by VulDB Data Team • 08/23/2019
The vulnerability described in CVE-2007-4238 represents a critical privilege escalation flaw in IBM AIX operating systems version 5.2 and 5.3. This issue stems from improper file ownership and permissions for the pioinit binary, which serves as a crucial component in the printing subsystem of the AIX environment. The flaw allows local attackers with minimal privileges to escalate their access level to root, creating a significant security risk for systems running these older AIX versions.
The technical root cause of this vulnerability lies in the installation process of the pioinit binary, which is configured with user and group ownership set to bin rather than the appropriate system administrators group. This misconfiguration creates a dangerous scenario where local users who possess either bin or printq privileges can manipulate the pioinit binary to execute arbitrary code with elevated privileges. The pioinit program is typically used for printer initialization and management tasks, making it a legitimate system component that could be exploited if proper access controls are not enforced.
From an operational perspective, this vulnerability presents a severe threat to system integrity and confidentiality. Attackers exploiting this flaw can gain complete administrative control over affected AIX systems, potentially leading to data breaches, system compromise, and unauthorized access to sensitive information. The impact extends beyond individual system compromise as attackers could use this privilege escalation to move laterally within networks, establish persistent access, and conduct further malicious activities. The vulnerability is particularly concerning because it requires minimal privileges to exploit, making it accessible to users who might otherwise have limited access to system resources.
The exploitation of this vulnerability aligns with attack patterns documented in the MITRE ATT&CK framework under privilege escalation techniques, specifically targeting the 'Exploitation for Privilege Escalation' tactic. This flaw also relates to CWE-276, which addresses improper file permissions and access control issues. Organizations running AIX 5.2 and 5.3 systems are strongly advised to implement immediate mitigations including proper file ownership enforcement, permission adjustments, and system updates. The recommended solution involves changing the ownership and permissions of the pioinit binary to ensure it is owned by root with appropriate restricted permissions. Additionally, system administrators should conduct comprehensive security audits to identify and remediate similar permission issues across other system binaries and components.
This vulnerability demonstrates the critical importance of proper system hardening and access control implementation in operating system security. The flaw highlights how seemingly minor configuration issues can result in severe security implications, particularly when system binaries are not properly secured against unauthorized modification. Organizations should establish robust security practices including regular permission reviews, vulnerability assessments, and timely patch management to prevent similar issues from compromising system security. The vulnerability also underscores the necessity of maintaining current system versions and avoiding the use of unsupported operating system releases that may contain unpatched security flaws.