CVE-2004-0545 in AIX
Summary
by MITRE
LVM for AIX 5.1 and 5.2 allows local users to overwrite arbitrary files via a symlink attack.
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Analysis
by VulDB Data Team • 06/30/2021
The vulnerability identified as CVE-2004-0545 represents a significant security flaw in the Logical Volume Manager implementation for IBM AIX operating systems version 5.1 and 5.2. This issue stems from improper handling of symbolic links during file operations within the LVM subsystem, creating a path traversal condition that enables local attackers to manipulate file permissions and potentially overwrite critical system files. The vulnerability specifically affects the way LVM processes symbolic links when creating or modifying logical volumes, allowing malicious users to exploit this weakness through carefully crafted symlink attacks.
The technical root cause of this vulnerability lies in the insufficient validation of symbolic link targets within the LVM utility functions. When LVM processes volume creation or modification commands, it fails to properly resolve and validate symbolic links before performing file operations, which creates an opportunity for attackers to place malicious symlinks in strategic locations. This behavior directly corresponds to CWE-367, which describes the dangerous use of a path traversal attack through symbolic links. The flaw enables attackers to bypass normal file access controls by creating symbolic links that point to sensitive system files, then executing LVM commands that will follow these links and modify the target files rather than the intended locations.
The operational impact of this vulnerability extends beyond simple file overwrites, as local users with minimal privileges can leverage this weakness to escalate their access within the system. Attackers can use this technique to replace critical system binaries, configuration files, or log files with malicious versions, potentially leading to privilege escalation or persistent backdoor access. The vulnerability is particularly concerning in enterprise environments where AIX systems are deployed, as it allows unauthorized local users to compromise system integrity without requiring elevated privileges. This attack vector aligns with ATT&CK technique T1059, which covers the use of local commands and scripts to gain unauthorized access, and T1068, which involves exploiting local system vulnerabilities for privilege escalation.
Mitigation strategies for CVE-2004-0545 should focus on both immediate system hardening and long-term security improvements. System administrators should apply the appropriate IBM AIX security patches that address the symbolic link handling in LVM utilities, ensuring that all systems running AIX 5.1 and 5.2 are updated with the latest security fixes. Additionally, implementing proper file system permissions and monitoring for unauthorized symlink creation can help detect potential exploitation attempts. The recommended approach includes restricting the ability to create symbolic links in sensitive directories, implementing proper access controls for LVM operations, and establishing regular security audits to identify any potential symlink-based attack vectors. Organizations should also consider implementing privilege separation mechanisms and monitoring for suspicious LVM command executions that may indicate attempted exploitation of this vulnerability.