CVE-2006-3859 in Informix Dynamic Database Server
Summary
by MITRE
IBM Informix Dynamic Server (IDS) allows remote authenticated users to create and overwrite arbitrary files via the (1) LOTOFILE and (2) trl_tracefile_set functions, and the (3) "SET DEBUG FILE" commands.
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Analysis
by VulDB Data Team • 08/25/2019
The vulnerability identified as CVE-2006-3859 affects IBM Informix Dynamic Server (IDS), a relational database management system that has been widely deployed in enterprise environments for decades. This security flaw represents a critical file system manipulation vulnerability that allows authenticated remote attackers to gain unauthorized control over file operations within the database server environment. The vulnerability specifically targets three distinct functions and commands within the IDS system, creating multiple attack vectors that significantly expand the potential exploitation surface. The affected components include the LOTOFILE function, the trl_tracefile_set function, and the SET DEBUG FILE command, all of which provide mechanisms for file creation and modification that can be abused by malicious actors.
The technical implementation of this vulnerability stems from insufficient input validation and access control mechanisms within the IDS database server. When authenticated users execute the vulnerable functions or commands, they can specify arbitrary file paths that bypass normal file system permissions and security checks. This flaw essentially allows attackers to create new files or overwrite existing ones with potentially malicious content, potentially leading to privilege escalation, data corruption, or system compromise. The vulnerability operates at the database server level, meaning that successful exploitation could result in unauthorized file system access that extends beyond the database itself. The flaw is particularly concerning because it requires only authentication to the database system, making it accessible to users who have legitimate database access but should not have file system manipulation capabilities. According to CWE classification, this vulnerability maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability also aligns with ATT&CK technique T1078 which covers valid accounts and T1566 which covers credential access through exploitation of software vulnerabilities.
The operational impact of this vulnerability extends far beyond simple file manipulation, as it can enable attackers to perform more sophisticated attacks within the compromised environment. An attacker who successfully exploits this vulnerability could potentially overwrite critical system files, inject malicious code into database processes, or create backdoor access points within the database server. The ability to overwrite arbitrary files could lead to denial of service conditions, data integrity compromise, or even complete system compromise if the overwritten files include system binaries or configuration files. Additionally, the vulnerability could be leveraged as a stepping stone for further attacks within the network infrastructure, as database servers often have elevated privileges and access to sensitive data. The impact is particularly severe in enterprise environments where IDS systems may be running with administrative privileges or where database files contain sensitive organizational data. Organizations using IDS versions prior to the patched releases would be vulnerable to this attack vector, and the exploitation could occur without detection, as the actions would appear to be legitimate database operations performed by authenticated users.
Organizations should implement immediate mitigations to address this vulnerability including applying the appropriate security patches provided by IBM, which would correct the input validation issues in the affected functions and commands. Network segmentation and access control measures should be strengthened to limit database access to only authorized personnel and systems, while implementing monitoring solutions that can detect unusual file creation or modification patterns within database server environments. The principle of least privilege should be enforced by ensuring that database users have only the minimum necessary permissions required for their legitimate operations, preventing unnecessary access to file system functions. Security configuration reviews should be conducted to disable or restrict the use of the vulnerable LOTOFILE, trl_tracefile_set, and SET DEBUG FILE functions when they are not required for operational purposes. Additionally, organizations should implement comprehensive logging and monitoring of database activities to detect potential exploitation attempts, and conduct regular security assessments to identify and remediate similar vulnerabilities in other database systems. The vulnerability also highlights the importance of proper input validation and access control mechanisms in database management systems, as these are fundamental security requirements that should be implemented across all database server configurations.