PSFTP v.1.8 Build 921 - Null Pointer (DoS) Vulnerability

2012-04-22T00:00:00
ID VULNERLAB:523
Type vulnerlab
Reporter Vulnerability Laboratory [Research Team] - N/A Anonymous
Modified 2012-04-22T00:00:00

Description

                                        
                                            Document Title:
===============
PSFTP v.1.8 Build 921 - Null Pointer (DoS) Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=523


Release Date:
=============
2012-04-22


Vulnerability Laboratory ID (VL-ID):
====================================
523


Common Vulnerability Scoring System:
====================================
2.1


Product & Service Introduction:
===============================
PSFtp ist eine benutzerfreundliche, ergonomische, kompakte und zuverlässige FTP Client Software mit einem großen 
Funktionsumfang. Was ist ein FTP Client? Das ist ein Programm (einige nennen es auch einfach ein FTP Programm), welches 
mit einem Dateimanager vergleichbar ist. Nur greift es nicht etwa auf eine andere Partition oder ein anderes Laufwerk zu, 
sondern auf einen Rechner im Internet - auf einen FTP Server. Ein FTP Client eignet sich bestens für die Homepage-Pflege 
(natürlich nicht nur dafür). Sie können z.B. Ihre Homepage-Dateien leicht auf einen FTP Server hochladen (engl. Upload) 
oder auch irgendwelche Dateien herunterladen (engl. Download). 

(Copy of the Vendor Homepage: http://www.psftp.de/index.php )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Researcher Team discovered Null Pointer Dereference (DoS) Vulnerability in PSFTP v.1.8 Build 921.


Vulnerability Disclosure Timeline:
==================================
2012-04-23:	Public or Non-Public Disclosure


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


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


Severity Level:
===============
Low


Technical Details & Description:
================================
A Null Pointer Dereference (DoS) Vulnerability is detected in PSFTP v.1.8 Build 921. The vulnerability allows an 
local privileged user to crash down the service with a persistent effect(stable). The bug is located when processing 
to load large unicode keys over the license management box of the psftp client software. The inserted unicode or numeric 
string got saved on the PSFTP_Key.dat which results in the stable null pointer dereference crash after the software restart.
Successful exploitation results in a stable (bex exception) application (StackHash_e98d) crash.

Vulnerable Module(s):
				[+] PSFTP_Key


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


Security Risk:
==============
The security risk of the null pointer (dos) vulnerability is estimated as medium(-).


Credits & Authors:
==================
Vulnerability Laboratory [Research Team]  -    N/A  Anonymous


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=========================
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