Bug #52998 [NEW]: memory content leak when using invalid utf-8 with XMLWriter::writeAttribute
| From: | kees at outflux dot net | Date: | Wed, 06 Oct 2010 01:52:17 +0000 |
| Subject: | Bug #52998 [NEW]: memory content leak when using invalid utf-8 with XMLWriter::writeAttribute | ||
| Groups: | php.bugs | ||
| Request: | Send a blank email to php-bugs+get-154938@lists.php.net to get a copy of this message | ||
From:
Operating system: Ubuntu 10.10
PHP version: 5.3.3
Package: XML Writer
Bug Type: Bug
Bug description:memory content leak when using invalid utf-8 with XMLWriter::writeAttribute
Description:
------------
It seems that PHP is not correctly using libxml2's xmlwriter routines, and
allows passing in invalid utf-8 strings which are then misparsed by
libxml2, allowing memory contents to leak into the resulting output.
Test script:
---------------
<?php
# Copyright 2010, Canonical, Ltd.
# Author: Kees Cook <kees@ubuntu.com>
# License: GPLv3
#
# Proof-of-concept memory content leak
$xw = new XMLWriter();
$xw->openURI('php://output');
$xw->startElement('input');
$xw->writeAttribute('value', "\xe0\x81");
$xw->endElement();
?>
Expected result:
----------------
<input value="à&#e81"/>
Actual result:
--------------
PHP Warning: XMLWriter::writeAttribute(): string is not in UTF-8 in
/tmp/xmlwriter.php on line 12
<input
value="@±ï¿½Ë[����ĹJ���R���Q"/>
--
Edit bug report at http://bugs.php.net/bug.php?id=52998&edit=1
--
Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=52998&r=trysnapshot52
Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=52998&r=trysnapshot53
Try a snapshot (trunk): http://bugs.php.net/fix.php?id=52998&r=trysnapshottrunk
Fixed in SVN: http://bugs.php.net/fix.php?id=52998&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=52998&r=needdocs
Fixed in release: http://bugs.php.net/fix.php?id=52998&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=52998&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=52998&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=52998&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=52998&r=support
Expected behavior: http://bugs.php.net/fix.php?id=52998&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=52998&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=52998&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=52998&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=52998&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=52998&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=52998&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=52998&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=52998&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=52998&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=52998&r=mysqlcfg