CVE-2012-2194 in DB2
Summary
by MITRE
Directory traversal vulnerability in the SQLJ.DB2_INSTALL_JAR stored procedure in IBM DB2 9.1 before FP12, 9.5 through FP9, 9.7 through FP6, 9.8 through FP5, and 10.1 allows remote attackers to replace JAR files via unspecified vectors.
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Analysis
by VulDB Data Team • 03/26/2021
The vulnerability identified as CVE-2012-2194 represents a critical directory traversal flaw within IBM DB2 database management systems affecting multiple versions including 9.1 through FP11, 9.5 through FP9, 9.7 through FP6, 9.8 through FP5, and 10.1. This weakness resides in the SQLJ.DB2_INSTALL_JAR stored procedure which is responsible for installing Java Archive files within the database environment. The vulnerability enables remote attackers to manipulate file system operations through unspecified vectors that allow them to replace existing JAR files with malicious alternatives. The directory traversal aspect of this vulnerability means that attackers can potentially navigate beyond the intended file system boundaries and access or modify files that should remain protected within the database's security context. This flaw operates at the intersection of database security and file system access controls, creating a pathway for privilege escalation and potential code execution within the database environment.
The technical implementation of this vulnerability stems from insufficient input validation and improper access control mechanisms within the DB2_INSTALL_JAR procedure. Attackers can exploit this weakness by crafting malicious input parameters that manipulate the file path resolution process, allowing them to specify arbitrary file locations within the database server's file system. The unspecified vectors mentioned in the description suggest that multiple attack surfaces exist, potentially including network-based inputs, database user privileges, or parameter handling within the stored procedure itself. This vulnerability directly maps to CWE-22 - Improper Limitation of a Pathname to a Restricted Directory, which classifies directory traversal attacks as a fundamental security flaw in file system access controls. The flaw essentially allows an attacker to bypass normal file system security boundaries and manipulate the database's Java classpath by replacing legitimate JAR files with malicious ones that could execute unauthorized code when loaded by the database's Java virtual machine.
The operational impact of CVE-2012-2194 extends beyond simple file replacement, as it creates a potential gateway for more sophisticated attacks within database environments. An attacker who successfully exploits this vulnerability could replace legitimate database JAR files with malicious versions containing backdoors, data exfiltration modules, or other malicious code that would execute within the database server's Java execution context. This presents a significant risk to database integrity and confidentiality, as the database server could become a pivot point for broader network attacks or data breaches. The vulnerability particularly affects organizations using IBM DB2 in production environments where database users may have elevated privileges, as the ability to replace JAR files could lead to complete system compromise. This attack vector aligns with ATT&CK technique T1059.007 - Command and Scripting Interpreter: Java, as successful exploitation would enable attackers to execute malicious Java code within the database environment. The vulnerability also relates to ATT&CK technique T1566.001 - Phishing: Spearphishing Attachment, as attackers might use this vulnerability to deploy malicious JAR files that appear legitimate but contain hidden malicious payloads.
Organizations affected by this vulnerability should immediately implement comprehensive mitigation strategies including applying the relevant IBM security patches and fixes for their specific DB2 versions, implementing strict access controls for database users with Java installation privileges, and monitoring database logs for suspicious file operations. The recommended approach involves disabling unnecessary database procedures, implementing network segmentation to limit access to database servers, and establishing robust file integrity monitoring systems that can detect unauthorized JAR file modifications. Database administrators should also review and restrict the permissions of users who have access to the SQLJ.DB2_INSTALL_JAR procedure, ensuring that only trusted administrative accounts can execute these operations. Additionally, organizations should consider implementing database activity monitoring solutions that can detect anomalous file system operations and alert security teams to potential exploitation attempts. The vulnerability demonstrates the importance of maintaining up-to-date security patches and implementing defense-in-depth strategies, as this flaw represents a classic example of how insufficient input validation in database stored procedures can create significant security risks. This vulnerability also underscores the need for regular security assessments of database environments and proper privilege management to prevent unauthorized code deployment within critical database systems.