CVE-2007-1027 in DB2
Summary
by MITRE
Certain setuid DB2 binaries in IBM DB2 before 9 Fix Pack 2 for Linux and Unix allow local users to overwrite arbitrary files via a symlink attack on the DB2DIAG.LOG temporary file.
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Analysis
by VulDB Data Team • 06/09/2025
The vulnerability identified as CVE-2007-1027 represents a critical privilege escalation flaw within IBM DB2 database software versions prior to 9 Fix Pack 2 on Linux and Unix systems. This issue stems from improper handling of temporary files by setuid binaries, creating a dangerous condition that allows local attackers to manipulate system resources through symbolic link attacks. The vulnerability specifically targets the DB2DIAG.LOG temporary file, which serves as a diagnostic log output location during database operations. When DB2 binaries execute with elevated privileges through setuid mechanisms, they create temporary files in predictable locations without proper security checks, enabling malicious users to establish symbolic links that redirect file operations to arbitrary system locations.
The technical exploitation of this vulnerability relies on the fundamental principle of insecure temporary file creation, which maps to CWE-377 - Insecure Temporary File and CWE-378 - Poorly Made Temporary Files. Attackers can leverage this weakness by creating symbolic links with the same names as expected temporary files in directories where the vulnerable DB2 binaries operate. When the setuid binary executes and attempts to write to the DB2DIAG.LOG file, it follows the symbolic link and writes data to the attacker-controlled target file instead of the intended temporary location. This allows attackers to overwrite system files, modify critical database configuration elements, or potentially inject malicious content into files with elevated privileges.
The operational impact of CVE-2007-1027 extends beyond simple file overwrites, as it provides attackers with a pathway to escalate privileges within database environments where DB2 runs with elevated permissions. The vulnerability affects database administrators who may inadvertently run DB2 processes with setuid permissions, creating a persistent threat vector that remains active until the software is properly patched. This issue particularly impacts enterprise environments where database systems are critical infrastructure components, as successful exploitation can lead to complete system compromise through database privilege escalation. The vulnerability's persistence across multiple DB2 versions and platforms makes it a significant concern for organizations maintaining legacy database installations that have not received the necessary security updates.
Organizations should implement immediate mitigations including applying IBM's official security patches for DB2 9 Fix Pack 2 and subsequent releases, which address the insecure temporary file handling by ensuring proper file creation checks and validation. System administrators should also conduct comprehensive audits of setuid binaries within database environments, implementing additional security controls such as file system permissions, access control lists, and monitoring for suspicious symbolic link creation patterns. The vulnerability's classification under ATT&CK technique T1068 - Exploitation for Privilege Escalation highlights the need for layered security approaches including network segmentation, privilege separation, and regular security assessments. Additionally, implementing automated monitoring solutions that detect unauthorized symbolic link creation in database-related temporary directories can provide early warning capabilities for potential exploitation attempts. Organizations should also consider implementing the principle of least privilege for database system accounts and regularly review database configuration settings to minimize the attack surface and reduce the likelihood of successful exploitation.