[PHP-DEV] PHP 4.0 Bug #6642 Updated: Userspace exploit crashes web-serving machine From: jmoore <email protected>
Date: 12/29/00

ID: 6642
Updated by: jmoore
Reported By: macabre <email protected>
Status: Assigned
Old-Bug Type: Reproduceable crash
Bug Type: Feature/Change Request
Assigned To: jmoore
Comments:

OK for me it isnt that bad.. each apache process dies in turn but the computer is still 100% usable even with 1000 requests, the usage of apache grows then apache becomes defunct at which point another process is started.

This is with apache as mod_php and CGI.

CHanging this to a feature change request as your asking that a script cannot include itself.

James

Previous Comments:
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[2000-12-23 21:07:12] jmoore <email protected>
I will test to see if this is the case if so I doubt there will be a fix due to speed but maybe somthing for a future safemode improvemnt.

James

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[2000-09-09 15:01:25] macabre <email protected>
Using: Apache 1.3.12/PHP4 with MySQL support

I have recently discovered a bug in PHP 4 (but not specifically 4)
which unviels the fact that any user on the system can crash the machine
with a very simple PHP document. They can do this by using the Include()
function to include the same document being loaded, causing a serious recursion problem which will quickly max out CPU and memory usage of the web-serving machine, especially if a phpInfo() call is done before the Include()

I am currently working on a patch for this.

Here is the exploitable code:

index.php:

<html lang="en">
<body>
<?php phpInfo(); ?>
<?php Include("./index.php"); ?>
</body>
</html>

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Full Bug description available at: http://bugs.php.net/?id=6642 

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