CVE-2003-0898 in DB2 Universal Database
Summary
by MITRE
IBM DB2 7.2 before FixPak 10a, and earlier versions including 7.1, allows local users to overwrite arbitrary files and gain privileges via a symlink attack on (1) db2job and (2) db2job2.
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Analysis
by VulDB Data Team • 01/24/2025
The vulnerability identified as CVE-2003-0898 represents a critical privilege escalation and file overwriting flaw affecting IBM DB2 database management systems version 7.2 and earlier, including version 7.1. This security weakness stems from improper handling of symbolic links within two specific executables: db2job and db2job2. The vulnerability creates a path traversal condition that allows local attackers to manipulate file system operations and potentially execute arbitrary code with elevated privileges.
The technical implementation of this vulnerability occurs through a symlink attack vector that exploits the way these DB2 executables process temporary files and symbolic links. When the db2job and db2job2 programs execute, they create temporary files or directories that can be manipulated by local users through symbolic link attacks. This occurs because the programs do not properly validate or sanitize the symbolic link references before performing file operations. The flaw is particularly dangerous because it allows attackers to overwrite files in arbitrary locations on the system, potentially targeting system-critical files or configuration data. This type of vulnerability is categorized under CWE-59 as improper link resolution, which is a well-documented weakness in file system access controls and privilege management.
The operational impact of CVE-2003-0898 extends beyond simple file overwriting to encompass full system compromise potential. Local attackers who can execute these vulnerable programs gain the ability to escalate privileges and modify critical system files, potentially leading to complete system takeover. The vulnerability affects database administrators and system operators who may inadvertently execute these programs with elevated privileges, making it particularly dangerous in multi-user environments. This flaw aligns with ATT&CK technique T1068 which describes privilege escalation through local exploitation of system vulnerabilities, and T1078 which covers legitimate credentials and access to system resources.
Organizations running affected IBM DB2 versions should implement immediate mitigations including applying the appropriate FixPak updates, specifically FixPak 10a for version 7.2 and equivalent patches for earlier versions. System administrators should also consider implementing additional controls such as restricting execution permissions on vulnerable executables, monitoring for suspicious file creation patterns, and conducting thorough access control reviews. The vulnerability demonstrates the importance of proper file system permissions and the dangers of insecure temporary file handling in database management systems. Security teams should also consider implementing privilege separation mechanisms and regularly auditing system configurations to prevent exploitation of similar weaknesses in other database components. This vulnerability serves as a reminder of the critical need for proper input validation and secure coding practices in enterprise database systems, particularly when handling file system operations and symbolic link resolution.