IBM DB2 9.7 / 10.1 / 10.5 / 11.1 Command Line Processor Buffer Overflow

2017.06.27
Credit: Leon Juranic
Risk: High
Local: Yes
Remote: No
CWE: CWE-119


CVSS Base Score: 4.4/10
Impact Subscore: 6.4/10
Exploitability Subscore: 3.4/10
Exploit range: Local
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

''' DefenseCode Security Advisory IBM DB2 Command Line Processor Buffer Overflow Advisory ID: DC-2017-04-002 Advisory Title: IBM DB2 Command Line Processor Buffer Overflow Advisory URL: http://www.defensecode.com/advisories/IBM_DB2_Command_Line_Processor_Buffer_Overflow.pdf Software: IBM DB2 Version: V9.7, V10.1, V10.5 and V11.1 on all platforms Vendor Status: Vendor Contacted / Fixed (CVE-2017-1297) Release Date: 26.06.2017 Risk: High 1. General Overview =================== IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server) Command Line Process (CLP) is vulnerable to a stack based buffer overflow, caused by improper bounds checking which could allow an attacker to execute arbitrary code. The vulnerability is triggered by providing an overly long procedure name inside a CALL statement. 2. Software Overview =================== DB2 is a database product from IBM. It is a Relational Database Management System. DB2 is designed to store, analyze and retrieve the data efficiently. DB2 currently supports Linux, UNIX and Windows platforms. db2bp is a persistent background process for the DB2 Command Line Processor, and it is the process which actually connects to the database. 3. Brief Vulnerability Description ================================== By providing a specially crafted command file to the db2 CLP utility, it is possible to cause a buffer overflow and possibly hijack the execution flow of the program. Crafted file contains a CALL statement with an overly long procedure parameter. 3.1 Proof of Concept The following python script will generate a proof of concept .sql crash test file that can be used to verify the vulnerability: ------- ''' #!/usr/bin/python load_overflow = 'A' * 1000 statement = "CALL " + load_overflow + ";" crash_file = open("crash.sql", "w") crash_file.write(statement) crash_file.close() ''' ------- PoC usage: db2 -f crash.sql 4. Credits ========== Vulnerability discovered by Leon Juranic, further analysis by Bosko Stankovic. 5. About DefenseCode ================================ DefenseCode L.L.C. delivers products and services designed to analyze and test web, desktop and mobile applications for security vulnerabilities. DefenseCode ThunderScan is a SAST (Static Application Security Testing, WhiteBox Testing) solution for performing extensive security audits of application source code. ThunderScan performs fast and accurate analyses of large and complex source code projects delivering precise results and low false positive rate. DefenseCode WebScanner is a DAST (Dynamic Application Security Testing, BlackBox Testing) solution for comprehensive security audits of active web applications. WebScanner will test a website's security by carrying out a large number of attacks using the most advanced techniques, just as a real attacker would. Subscribe for free software trial on our website http://www.defensecode.com/ '''


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