CVE-2003-0836 in DB2 Universal Database
Summary
by MITRE
Stack-based buffer overflow in IBM DB2 Universal Data Base 7.2 before Fixpak 10 and 10a, and 8.1 before Fixpak 2, allows attackers with "Connect" privileges to execute arbitrary code via a LOAD command.
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Analysis
by VulDB Data Team • 02/23/2017
The vulnerability described in CVE-2003-0836 represents a critical stack-based buffer overflow within IBM DB2 Universal Database versions 7.2 and 8.1. This flaw exists in the database management system's handling of the LOAD command, which is commonly used to import data into database tables. The vulnerability specifically affects systems running DB2 7.2 before Fixpak 10 and 10a, as well as DB2 8.1 before Fixpak 2, making it a widespread issue across multiple database versions. The security implications are severe because the vulnerability can be exploited by authenticated users who possess basic "Connect" privileges, which are often granted to legitimate database users for routine operations.
The technical nature of this vulnerability stems from improper input validation within the LOAD command processing functionality. When an attacker submits maliciously crafted input to the LOAD command, the database server fails to properly bounds-check the input data against the allocated stack buffer space. This allows the attacker to overwrite adjacent memory locations on the stack, potentially corrupting the program's execution flow. The stack-based buffer overflow occurs because the database server allocates a fixed-size buffer on the stack to handle the input data, but does not verify that the incoming data length exceeds the buffer capacity. This type of vulnerability is categorized as CWE-121 Stack-based Buffer Overflow, which is classified as a fundamental memory safety issue that has been consistently exploited in database systems throughout the years.
The operational impact of this vulnerability is particularly concerning because it enables privilege escalation and arbitrary code execution within the database environment. An attacker with minimal "Connect" privileges can leverage this vulnerability to gain complete control over the database server, potentially leading to data theft, data manipulation, or the use of the compromised database server as a launching point for further attacks within the network infrastructure. The attack vector is particularly dangerous because it requires only basic database connection privileges, which are commonly granted to various user roles including application users, developers, and database administrators. This means that even users with relatively limited access rights could potentially exploit this vulnerability to compromise the entire database system. The vulnerability aligns with ATT&CK technique T1078 Valid Accounts, as attackers can exploit legitimate database connections to execute malicious payloads.
The exploitation of this vulnerability demonstrates the critical importance of maintaining up-to-date database security patches and implementing proper input validation controls. Organizations running affected DB2 versions should immediately apply the appropriate Fixpaks to address this vulnerability, as the window for exploitation remains open for systems that have not been patched. Database administrators should also implement additional monitoring and access controls to detect potentially malicious use of the LOAD command. The vulnerability highlights the necessity of following security best practices such as the principle of least privilege, regular security assessments, and timely patch management. Furthermore, this case exemplifies how seemingly routine database operations like data loading can become attack vectors when proper security measures are not implemented, emphasizing the need for comprehensive security testing of database management systems and their command processing functions.