From: 5jpck6k02 at sneakemail dot com
Operating system: Linux
PHP version: 5.1.2
PHP Bug Type: PCRE related
Bug description: Can't include a literal plus sign in a character class
Description:
------------
A simple regular expression that has worked for years in PHP 4
suddenly fails under PHP 5.
Reproduce code:
---------------
foreach($_GET as $val)
{
if ( preg_match("/[^a-z0-9_\-\+]/i", $val) )
{
die("<p>Invalid request.</p>");
}
}
Expected result:
----------------
The above code is used to filter out bogus GET requests
containing potential XSS attacks at the top of a script. It
should allow all legitimate requests comprised of alphanumeric
characters, underscores, and plus and minus signs, through,
while kicking anything containing a character not included in
the character class out,
Actual result:
--------------
The regex matches plus signs contained in query strings even
though the plus sign is explicitly included in the negated
character class. I believe it is being interpreted as a
quantifier when it is meant to be taken literally, I have not
been able to find any means of successfully including a
literal plus sign in a character class under PHP 5 to date.
--
Edit bug report at http://bugs.php.net/?id=36703&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=36703&r=trysnapshot44
Try a CVS snapshot (PHP 5.1):
http://bugs.php.net/fix.php?id=36703&r=trysnapshot51
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=36703&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=36703&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=36703&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=36703&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=36703&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=36703&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=36703&r=support
Expected behavior: http://bugs.php.net/fix.php?id=36703&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=36703&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=36703&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=36703&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=36703&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=36703&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=36703&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=36703&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=36703&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=36703&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=36703&r=mysqlcfg
