CVE-2019-4606 in DB2 High Performance Unload
Summary
by MITRE
IBM DB2 High Performance Unload load for LUW 6.1 and 6.5 could allow a local attacker to execute arbitrary code on the system, caused by an untrusted search path vulnerability. By using a executable file, an attacker could exploit this vulnerability to execute arbitrary code on the system. IBM X-Force ID: 168298.
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Analysis
by VulDB Data Team • 03/11/2024
IBM DB2 High Performance Unload for Linux Unix and Windows versions 6.1 and 6.5 contains a critical untrusted search path vulnerability that enables local attackers to execute arbitrary code on affected systems. This vulnerability stems from improper handling of dynamic library loading mechanisms within the application's execution environment. The flaw occurs when the application searches for required shared libraries in directories that are not properly secured or validated, creating an opportunity for malicious actors to place crafted executables in these search paths. The vulnerability specifically impacts the high performance unload functionality which is designed to efficiently extract data from database systems. When the application attempts to load necessary libraries, it traverses a predetermined search path that may include writable directories accessible to unprivileged users. This design flaw allows an attacker with local access to manipulate the library loading process by placing malicious executables or shared objects in directories that are searched before system-secure locations. The vulnerability is classified under CWE-426 Untrusted Search Path, which is a well-documented weakness in software security that occurs when applications use search paths that can be manipulated by attackers. The attack vector requires local system access but does not necessitate elevated privileges, making it particularly dangerous in environments where user accounts may have broader access rights than expected. This vulnerability directly maps to ATT&CK technique T1059 Command and Scripting Interpreter where attackers can execute malicious code through compromised applications that load untrusted libraries. The operational impact of this vulnerability extends beyond simple code execution as it can potentially allow attackers to escalate privileges, access sensitive database information, or establish persistent access points within the database environment. The affected IBM DB2 versions represent a significant security risk for organizations relying on these database management systems, particularly in enterprise environments where database servers may be accessed by multiple user accounts or where privilege separation is not properly enforced. Organizations should immediately implement mitigations including restricting write access to directories in the application search path, validating all library loading operations, and applying the relevant IBM security patches. The vulnerability demonstrates the critical importance of secure coding practices and proper library loading mechanisms in database applications where performance optimization should never compromise security. The presence of such flaws in database management systems can have cascading effects on entire enterprise security postures, as database servers often contain sensitive organizational data and may be targeted as entry points for broader network attacks. This particular vulnerability highlights the need for continuous security assessment of database applications and the importance of addressing security concerns in performance optimization features. The IBM X-Force ID 168298 reference confirms the vulnerability's recognition within the security community and underscores the urgency for affected organizations to implement immediate remediation measures. Security teams should conduct comprehensive assessments of their DB2 installations to identify systems running the vulnerable versions and ensure proper patch management procedures are in place to prevent exploitation of this critical security flaw.