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Questions  |  score: 4  |  Solved By 531 People  |  37712 views  |  since Jun 16, 2009 - 09:14:35

PHP 0816 (Exploit, PHP)

Description
Your mission is to read solution.php by exploiting the highlighter script.
Again, you will get the source of the current script in action.
Below are three links as example how to use my nice highlighter script.
Good luck.
GeSHi`ed php code for code.php
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<?php
$cwd = getcwd();
chdir('../../');
require_once('challenge/html_head.php');
html_head('PHP0816 Challenge - The Highlighter');chdir($cwd);
 
# globals
global $highlights;
$highlights = array(); 
/**
 * Parse the GET parameters.
 */
foreach ($_GET as $key => $value){
        if ($key === 'src') {
                php0816SetSourceFile($value);
        }
        elseif ($key === 'mode') {                php0816execute($value);
        }
        elseif ($key === 'hl') {
                php0816addHighlights($value);
        }}
 
 
/**
 * Make magic quotes off ! * (it is really defined in /include/util/Class_Common.php and will deprecate soon)
 * (also you can look on the html_head() stuff, etc. WeChall source is public domain)
 * (if you like a hint: There is a main logical error in this script, applies to all programming languages, not only php. H4\/3: |>  |-|  |_|  |\|)
 */
/*final class Common
{
        public function getGet($varname, $default=false)
        {
                if (!isset($_GET[$varname])) {                        return $default;
                }
                return 
                        get_magic_quotes_gpc() > 0 ?
                                stripslashes($_GET[$varname]) :                                $_GET[$varname];
        }
}
*/
/** * Set the text file to show.
 * Sanitize Get Parameter.
 * Only allow 3 different files by whitelist at the moment.
 * TODO: broken ?!? people can see other files ! :(
 * @param $filename string - the filename * @return void
 */
function php0816SetSourceFile($filename)
{
        $filename = (string) $filename;        
        static $whitelist = array(
                'test.php',
                'index.php',
                'code.php',        );
 
        # Sanitize by whitelist
        if (!in_array($filename, $whitelist, true))
        {                $_GET['src'] = false;
        }
}
 
/** * Add the highlighter keywords. 
 * @param $keyword array of strings - the highlighting keywords
 * @return void
 */
function php0816addHighlights($keywords){
        global $highlights;
        if (!is_array($keywords)) { return true; }
        
        foreach($keywords as $k)        {
                $highlights[] = $k;
        }
}
 /**
 * Execute action.
 * Currently only hl is known.
 * @param $mode
 * @return void */
function php0816execute($mode)
{
        switch($mode)
        {                case 'hl': php0816Highlighter(); break;
        }
}
 
/** * Call the highlighter :)
 * sweeeeet.
 * @return void
 */
function php0816Highlighter(){
        global $highlights; # <-- global highlights :D
        
        # SOMEONE SAID THIS WILL FIX IT, BUT PEOPLE CAN STILL SEE solution.php :(  #
        $filename = str_replace(array('/', '\\', '..'), '', Common::getGet('src'));#        
        if (false === ($text = @file_get_contents($filename)))
        {
                echo '<div>File not Found: '.htmlspecialchars($filename, ENT_QUOTES).'</div>';
                return false;        }
        
        $text = htmlspecialchars($text, ENT_QUOTES);
 
        foreach ($highlights as $highlight)        {
                $stlye = 'color:#CD7F32; background-color:white; padding: 0 8px;'; 
                $text = str_replace($highlight, '<b style="'.$stlye.'">'.$highlight.'</b>', $text);
        }
                echo '<pre>'.$text.'</pre>';
}
 
$cwd = getcwd();
chdir('../../');require_once('challenge/html_foot.php');
chdir($cwd);
?>
 
Your solution for PHP 0816
Answer
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