From: nomail at example dot com
Operating system: Debian Linux 5.0 Lenny
PHP version: 5.2.10
PHP Bug Type: *Regular Expressions
Bug description: preg_replace bug and potential security issue
Description:
------------
Using the latest stable Debian's PHP 5.2.6-1+lenny3. Can't use anything
newer on this production server, sorry.
Note that this malfunction in regular expressions might create exploitable
application vulnerabilities (for example, a forum routine to sanitize
posts). So this should be treated as a security fix.
// This code works as expected and outputs: ttt www.exa.com/ZZZ ttt
echo preg_replace(
'#([a-z\.]+)+ZZZ#',
'i',
'ttt www.exa.com/ZZZ ttt');
// The following code is the same but it will not work, even though it
// should. It will produce just an empty string. The only difference
// between this call and the previous call is that the text contains
// a LONGER domain name (instead of "exa", it contains the word
// "example").
echo preg_replace(
'#([a-z\.]+)+ZZZ#',
'i',
'ttt www.example.com/ZZZ ttt');
Note: preg_last_error() returns the bogus PREG_SET_ORDER, which should
apply only to preg_match_all() and not to preg_replace().
Reproduce code:
---------------
echo preg_replace(
'#([a-z\.]+)+ZZZ#',
'i',
'ttt www.example.com/ZZZ ttt');
Expected result:
----------------
ttt www.example.com/ZZZ ttt
Actual result:
--------------
Empty string
--
Edit bug report at http://bugs.php.net/?id=49091&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=49091&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=49091&r=trysnapshot53
Try a snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=49091&r=trysnapshot60
Fixed in SVN:
http://bugs.php.net/fix.php?id=49091&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=49091&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=49091&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=49091&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=49091&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=49091&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=49091&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=49091&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=49091&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=49091&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=49091&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=49091&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=49091&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=49091&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=49091&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=49091&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=49091&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=49091&r=mysqlcfg
