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www.waraxe.us Forum Index -> All other security holes -> this file is vuln????
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this file is vuln????
PostPosted: Thu Jul 01, 2010 12:22 pm Reply with quote
kr0k0
Advanced user
Advanced user
Joined: Jan 26, 2008
Posts: 128




Hey i m wonderin' if the file is vulnerable or no, With RFI or lfi,remote execution..Look please and tell...


Code:
<?PHP


// Check to ensure this file is within the rest of the framework
defined('JPATH_BASE') or die();

class patTemplate_OutputFilter_PdfLatex extends patTemplate_OutputFilter
{
/**
* filter name
*
* This has to be set in the final
* filter classes.
*
* @var string
*/
var $_name = 'PdfLatex';

var $_params = array(
'cacheFolder' => './'
);

/**
* tidy the data
*
* @access public
* @param string data
* @return string compressed data
*/
function apply( $data )
{
$cacheFolder = $this->getParam('cacheFolder');
$texFile = tempnam($cacheFolder, 'pt_tex_');
$fp = fopen($texFile, 'w');
fwrite($fp, $data);
fclose($fp);

$command = 'pdflatex '.$texFile;
exec($command);
exec($command);

$pdf = $texFile . '.pdf';
$pdf = file_get_contents($pdf);

return $pdf;
}
}
?>
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PostPosted: Thu Jul 01, 2010 7:11 pm Reply with quote
waraxe
Site admin
Site admin
Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




file_get_contents() and exec() both are using string parameter coming from php function tempnam:

http://php.net/manual/en/function.tempnam.php

And $cacheFolder is hardcoded, so there is nothing to exploit.
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PostPosted: Fri Jul 02, 2010 5:06 pm Reply with quote
Xuphanc
Beginner
Beginner
Joined: Jul 02, 2010
Posts: 1




If you find a User-tainted UNSERIALIZE() you can change the $cacheFolder to inject OS commands. It depends on your OS if non-existing dirs like

Code:
Foo;nc -l -p7777 -e `which bash`


Are excepted by tempnam(), You'll have to check. Smile

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this file is vuln????
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