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Bug #37113 Malicious Memory Management(?)
Submitted: 2006-04-17 21:08 UTC Modified: 2006-04-18 00:02 UTC
From: oliver dot block at lycos dot de Assigned:
Status: Not a bug Package: PCRE related
PHP Version: 5.1.2 OS: Unix
Private report: No CVE-ID: None
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From: oliver dot block at lycos dot de
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 [2006-04-17 21:08 UTC] oliver dot block at lycos dot de 
Description:
------------
preg_replace_callback returns content that should not be in memory!

Reproduce code:
---------------
input:

1. "Tue, 11 Apr 2006 17:09:22 GMT"
2. "Tue, 11 Apr 2006 20:26:57 +0000 (GMT)"
3. ""


function check_date($s)
{
   $muster = "/(Mon, |Tue, |Wed, |Thu, |Fri, |Sat, |Sun, )?(\d\d?) (.{3})
(\d\d\d\d) (\d\d:\d\d(:\d\d)?) (([+-](\d\d(\d\d)))|GMT)/";
   $result = "";
   $result = preg_replace_callback($muster, create_function('$match',
                 '$mon = array("Jan" => "01", "Feb" => "02", "Mar" => "03",
                               "Apr" => "04", "May" => "05", "Jun" => "06",
                               "Jul" => "07", "Aug" => "08", "Sep" => "09",
                               "Okt" => "10", "Nov" => "11", "Dez" => "12");
                  $mm = $mon[$match[3]];
                  return "{$match[2]}.{$mm}.{$match[4]}";
                 '),
             $s);
   return $result;
}


Expected result:
----------------
1. "11.04.2006"
2. "11.04.2006"
3. ""


Actual result:
--------------
1. "11.04.2006"
2. "11.04.2006 (GMT)"
3. ""

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 [2006-04-17 22:59 UTC] iliaa@php.net 
Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions.  Due to the volume
of reports we can not explain in detail here why your report is not
a bug.  The support channels will be able to provide an explanation
for you.

Thank you for your interest in PHP.

Your regex fetches the GMT, so where is the problem.
 [2006-04-18 00:02 UTC] oliver dot block at lycos dot de 
But it does not return $match[7] which might contain GMT 
but _not_ (GMT).
 
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