Bug #64430 [NEW]: strip_tags() clobbers non-tag entities
From: gdataonline at gmail dot com
Operating system: Windows 7 x64
PHP version: 5.4.13
Package: Unknown/Other Function
Bug Type: Bug
Bug description:strip_tags() clobbers non-tag entities
Description:
------------
strip_tags() will clobber all remaining input after encountering non-HTML
tags, regardless if embedded in "allowable-tags".
When strip_tags() encounters a "<" followed by *any non-whitespace*, it
assumes it's an HTML tag, even if it couldn't legally be one. In the
example below, even something as simple as a "<=" appearing in JavaScript
is enough to trigger the behavior.
For a full list of characters that strip_tags() clobbers on, see this
example: http://ideone.com/BEPINI
Test script:
---------------
<?php
// Example 1: Without <=
$code = "<script>if (foo >= bar){ alert(0); }</script>";
var_dump(strip_tags($code));
var_dump(strip_tags($code, "<script>"));
// Example 2: With <=
$code = "<script>if (foo <= bar){ alert(0); }</script>";
var_dump(strip_tags($code));
var_dump(strip_tags($code, "<script>"));
?>
Expected result:
----------------
string(28) "if (foo >= bar){ alert(0); }"
string(45) "<script>if (foo >= bar){ alert(0); }</script>"
string(28) "if (foo <= bar){ alert(0); }"
string(45) "<script>if (foo <= bar){ alert(0); }</script>"
Actual result:
--------------
string(28) "if (foo >= bar){ alert(0); }"
string(45) "<script>if (foo >= bar){ alert(0); }</script>"
string(8) "if (foo "
string(16) "<script>if (foo "
--
Edit bug report at https://bugs.php.net/bug.php?id=64430&edit=1
--
Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=64430&r=trysnapshot54
Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=64430&r=trysnapshot53
Try a snapshot (trunk): https://bugs.php.net/fix.php?id=64430&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=64430&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=64430&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=64430&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=64430&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=64430&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=64430&r=support
Expected behavior: https://bugs.php.net/fix.php?id=64430&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=64430&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=64430&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=64430&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=64430&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=64430&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=64430&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=64430&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=64430&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=64430&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=64430&r=mysqlcfg
Thread (5 messages)
- gdataonline at gmail dot com