CVE-2008-4018 in AIX
Summary
by MITRE
swcons in bos.rte.console in IBM AIX 5.2.0 through 6.1.1 allows local users in the system group to create or overwrite an arbitrary file, and establish weak permissions and root ownership for this file, via unspecified vectors. NOTE: this can be leveraged to gain privileges. NOTE: this issue exists because of an incomplete fix for CVE-2007-5805.
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Analysis
by VulDB Data Team • 05/26/2025
The vulnerability described in CVE-2008-4018 represents a significant local privilege escalation issue within IBM AIX operating systems across versions 5.2.0 through 6.1.1. This flaw resides in the swcons component of the bos.rte.console subsystem, which is responsible for console management and system monitoring functions. The vulnerability specifically affects users who belong to the system group, a privileged user classification that typically includes processes requiring elevated system access. The core issue stems from improper access controls and file handling mechanisms within the swcons utility, creating a path for local attackers to manipulate system files through unspecified vectors that were not adequately addressed in previous security updates.
The technical nature of this vulnerability involves a privilege escalation vector that allows local users with system group membership to manipulate arbitrary files on the system. When exploited, the vulnerability enables attackers to create or overwrite files with weak permissions and root ownership, effectively bypassing normal file system access controls. The swcons utility appears to lack proper validation of file operations, allowing malicious users to specify target file paths that would normally be restricted. This flaw operates at the system level where the console management component executes with elevated privileges, making it particularly dangerous for local attackers who can leverage this to gain root access to the system.
The operational impact of CVE-2008-4018 extends beyond simple file manipulation as it creates a persistent backdoor mechanism for privilege escalation. Attackers who can successfully exploit this vulnerability can establish files with root ownership and weak permissions, which could later be exploited to execute malicious code with system-level privileges. This vulnerability is particularly concerning because it builds upon an incomplete fix for CVE-2007-5805, indicating that security remediation efforts were insufficient to fully address the underlying architectural flaws. The persistence of such vulnerabilities in system-level components like console management utilities creates long-term security risks that can be exploited by both malicious insiders and external attackers who gain local access to system resources.
The vulnerability aligns with CWE-276, which describes inadequate privileges, and represents a classic case of improper file permissions and access control. From an attack perspective, this flaw maps to ATT&CK technique T1068, which covers privilege escalation through local exploits, and T1078, which addresses valid accounts and legitimate credentials. Organizations running affected IBM AIX versions should prioritize immediate patching to address this vulnerability, as the incomplete nature of the previous fix suggests that similar architectural weaknesses may exist in other components. The vulnerability demonstrates the importance of comprehensive security testing and the necessity of thorough validation of security patches to ensure that root causes are fully addressed rather than merely mitigating symptoms. System administrators should also implement additional monitoring of console-related activities and file system changes to detect potential exploitation attempts.