CVE-2002-1550 in AIX
Summary
by MITRE
dump_smutil.sh in IBM AIX allows local users to overwrite arbitrary files via a symlink attack on temporary files.
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Analysis
by VulDB Data Team • 09/04/2019
The vulnerability identified as CVE-2002-1550 resides within the dump_smutil.sh script distributed with IBM AIX operating systems, representing a classic symlink attack scenario that exploits insecure temporary file handling practices. This flaw specifically affects local users who can leverage symbolic link manipulation to redirect file operations to arbitrary locations within the filesystem. The vulnerability stems from the script's failure to properly validate or secure temporary files during execution, creating opportunities for privilege escalation and unauthorized file manipulation. The issue is categorized under CWE-377 as insecure temporary file creation, which directly relates to improper handling of temporary resources that can be exploited by malicious actors.
The technical implementation of this vulnerability occurs when the dump_smutil.sh script creates temporary files without adequate security measures to prevent symbolic link attacks. Local attackers can create malicious symbolic links in directories where the script generates temporary files, causing the script to write data to unintended locations. This attack vector allows adversaries to overwrite critical system files, configuration data, or files belonging to other users with potentially malicious content. The flaw is particularly dangerous because it operates at the local user level without requiring elevated privileges, making it an attractive target for privilege escalation attacks. The attack typically involves the creation of carefully positioned symbolic links that redirect the script's temporary file operations to locations controlled by the attacker.
The operational impact of this vulnerability extends beyond simple file overwriting capabilities to encompass broader system compromise potential. An attacker exploiting this vulnerability can manipulate system configuration files, replace critical binaries, or corrupt system data structures that may lead to system instability or complete system compromise. The vulnerability affects IBM AIX systems running specific versions where the dump_smutil.sh script lacks proper temporary file handling mechanisms. The attack requires local access to the system but can be particularly devastating when combined with other privilege escalation techniques or when targeting system-critical files. Security implications include potential data integrity violations, unauthorized access to system resources, and the possibility of establishing persistent access mechanisms through compromised system files.
Mitigation strategies for CVE-2002-1550 focus on implementing proper temporary file handling practices and system hardening measures. System administrators should ensure that the dump_smutil.sh script is updated to use secure temporary file creation methods such as creating temporary files with restrictive permissions and using unique naming schemes that prevent symlink attacks. The implementation of proper file permission controls and directory access restrictions can significantly reduce the attack surface. Additionally, system administrators should consider implementing file integrity monitoring solutions to detect unauthorized modifications to critical system files. The vulnerability aligns with ATT&CK technique T1059.007 for execution through shell commands and T1548.001 for privilege escalation through file permissions. Regular security audits and vulnerability assessments should be conducted to identify similar insecure temporary file handling patterns in other system components. Organizations should also ensure that IBM AIX systems are kept up to date with security patches and that proper access controls are implemented to limit local user privileges where possible.