CVE-2000-0441 in AIX
Summary
by MITRE
Vulnerability in AIX 3.2.x and 4.x allows local users to gain write access to files on locally or remotely mounted AIX filesystems.
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Analysis
by VulDB Data Team • 04/21/2026
The vulnerability described in CVE-2000-0441 represents a significant security flaw in IBM AIX operating systems version 3.2.x and 4.x that affects file system access controls. This issue stems from improper handling of file permissions and access rights within the AIX kernel, specifically when dealing with filesystems that are either locally mounted or remotely accessed through network protocols. The flaw creates a path for local attackers to escalate their privileges and gain unauthorized write access to files that should otherwise remain protected, fundamentally undermining the integrity of the system's access control mechanisms.
The technical implementation of this vulnerability lies in the kernel's file system handling routines where the system fails to properly validate access permissions when processing file operations on mounted filesystems. When AIX processes file access requests, particularly those involving write operations, the kernel does not adequately verify whether the requesting user has proper authorization to modify files on the target filesystem. This occurs regardless of whether the filesystem is accessed locally through standard mount points or remotely through network file sharing protocols such as NFS or other distributed file systems. The flaw essentially allows any local user to bypass normal file permission checks and write to files that should be restricted, creating a privilege escalation vector that can be exploited to modify critical system files or user data.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it provides attackers with the ability to modify system-critical files and potentially compromise the entire system integrity. Local users who exploit this vulnerability can write to system binaries, configuration files, or even log files, enabling them to modify system behavior, hide their activities, or establish persistent access. This vulnerability directly violates the principle of least privilege and can lead to complete system compromise when combined with other exploitation techniques. The remote mounting aspect of the vulnerability is particularly concerning as it allows attackers to potentially exploit this flaw across network boundaries, expanding the attack surface significantly.
This vulnerability aligns with CWE-264, which addresses permissions, privileges, and access controls, and represents a classic example of inadequate access control validation in operating system kernels. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and can be leveraged as part of broader attack chains that include initial access and persistence mechanisms. The exploitability of this vulnerability is relatively straightforward for local attackers who understand the system's file access patterns, making it a commonly targeted issue in security assessments. Organizations running AIX 3.2.x and 4.x systems should immediately implement patches provided by IBM to address this vulnerability, as the flaw remains exploitable and can lead to complete system compromise. Additionally, system administrators should conduct thorough audits of file system permissions and access controls to identify any potential exploitation attempts and implement monitoring for suspicious file modification activities. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date system patches and proper access control configurations in enterprise environments.