SmartFTP v4.0.1190/4 - Local Buffer Overflow Vulnerability

Document Title:
===============
SmartFTP v4.0.1190/4 - Local Buffer Overflow Vulnerability



Release Date:
=============
2011-07-21


Vulnerability Laboratory ID (VL-ID):
====================================
127


Product & Service Introduction:
===============================
SmartFTP is an FTP (File Transfer Protocol) client which allows you to transfer files between your 
local computer and a server on the Internet. With its many basic and advanced Features SmartFTP also 
offers secure, reliable and efficient transfers that make it a powerful tool. Click here to 
Download our ftp software.

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


Abstract Advisory Information:
==============================
Vulnerability-Lab Team discovered a local Buffer-Overflow vulnerability on SmartFTP Software.


Vulnerability Disclosure Timeline:
==================================
2011-06-20:	Public or Non-Public Disclosure


Discovery Status:
=================
Published


Affected Product(s):
====================

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


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


Technical Details & Description:
================================
A Buffer Overflow vulnerability is detected on SmartFTP connection client. Local attackers can exploit the client software 
to get higher privileges on the affected system or easily crash the running process. The vulnerability is located in the 
sfFTPShellExtension.dll which is handling the namespace on communication with other bound external modules.


--- Exception/Error Logs ---

Problemereignisame:		BEX
Anwendungsname:			SmartFTP.exe
Anwendungsversion:		4.0.1072.0
Anwendungszeitstempel:		4b06f3fc
Fehlermodulname:		sfFTPShellExtension.dll
Fehlermodulversion:		4.0.1072.0
Fehlermodulzeitstempel:		4b06f214
Ausnahmeoffset:			003596a1
Ausnahmecode:			c0000417
Ausnahmedaten:			00000000
Betriebsystemversion:		6.0.6002.2.2.0.768.3
Gebietsschema-ID:		1031
Zusatzinformation 1:		2c9b
Zusatzinformation 2:		d30e94ee18f2fe8adb5b97f6c48e0520
Zusatzinformation 3:		658c
Zusatzinformation 4:		a782983440ba41f2e3a9c49453242f6b

Notice: This can result in a permanent software block/freeze via BEX after save.

Problemereignisame:	APPCRASH
Anwendungsname:	SmartFTP.exe
Anwendungsversion:	4.0.1072.0
Anwendungszeitstempel:	4b06f3fc
Fehlermodulname:	sfFavoritesShellExtension.dll
Fehlermodulversion:	4.0.1072.0
Fehlermodulzeitstempel:	4b06f1dd
Ausnahmecode:	c0000005
Ausnahmeoffset:	00090472
Betriebsystemversion:	6.0.6002.2.2.0.768.3
Gebietsschema-ID:	1031
Zusatzinformation 1:	aae7
Zusatzinformation 2:	4f345bad3e6f0f376ff192461b7769e6
Zusatzinformation 3:	c188
Zusatzinformation 4:	9d4917c9ad954529f1c2ff056562c811

Pictures:
		../app-crash.png
		../app-crash-stable.png
		../debug.png
		../reproduce.png


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by local attackers. For demonstration or reproduce ...

Manually reproduce ...
1. Run for example WinDBG on SmartFTP.exe
2. Startup software & switch to new Connections
3. Insert a long String as Name on the URL & declaration fields
4. Save the input & enjoy the results of the .dll

Pictures: 
		../buffer-overflow.png


Security Risk:
==============
The security risk of the local stack buffer overflow vulnerability is estimated as high.


Credits & Authors:
==================
Vulnerability Research Laboratory


Disclaimer & Information:
=========================
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