#6642 [Com]: Userspace exploit crashes web-serving machine

ID: 6642 Comment by: theaxiom at charter dot net Reported By: macabre at fl dot rr dot com Status: Bogus Bug Type: Feature/Change Request Operating System: Debian/Linux kernel 2.2.17 PHP Version: 4.0.2 New Comment: That is just not fair! I own a webhosting company and any one of my customers can do that!!! Previous Comments: ------------------------------------------------------------------------ [2002-01-28 20:05:23] yohgaki@php.net Including script itself is perfectly valid just like recursive function call. It's user's responsibitily not to write script that executes the same portion of code forever. ------------------------------------------------------------------------ [2000-12-29 12:34:09] jmoore@php.net unassigning it ------------------------------------------------------------------------ [2000-12-29 12:30:04] jmoore@php.net 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 ------------------------------------------------------------------------ [2000-12-23 21:07:12] jmoore@php.net 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 ------------------------------------------------------------------------ [2000-09-09 15:01:25] macabre at fl dot rr dot com 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> ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=6642&edit=1