From: spam04 at pornel dot net
Operating system: *
PHP version: 5.2.9
PHP Bug Type: PCRE related
Bug description: preg_replace /e modifier allows unexpected code execution
Description:
------------
preg_replace does not escape $ character. If double quotes are used in
replacement code, this enables unwanted injection of variables or even
execution of PHP code.
My suggestion is to escape $ character and discourage use of single
quotes in replacement code (because they're not compatible with the way
$ and " are escaped).
Reproduce code:
---------------
// simple case:
preg_replace('/.*/e','strtoupper("$0")', '$foo');
// code execution:
class test
{
function pwnd() {echo "pwnd!\n";}
function replace($str)
{
preg_replace('/.*/e','strtoupper("$0")', $str);
}
}
$t = new test();
$t->replace('{$this->pwnd()}');
Expected result:
----------------
$FOO
{$THIS->PWND()}
Actual result:
--------------
PHP Notice: Undefined variable: foo
pwnd!
--
Edit bug report at http://bugs.php.net/?id=47796&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=47796&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=47796&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=47796&r=trysnapshot60
Fixed in CVS:
http://bugs.php.net/fix.php?id=47796&r=fixedcvs
Fixed in CVS and need be documented:
http://bugs.php.net/fix.php?id=47796&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=47796&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=47796&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=47796&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=47796&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=47796&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=47796&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=47796&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=47796&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=47796&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=47796&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=47796&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=47796&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=47796&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=47796&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=47796&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=47796&r=mysqlcfg
