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Request #6642 Userspace exploit crashes web-serving machine
Submitted: 2000-09-09 15:01 UTC Modified: 2002-01-28 20:05 UTC
Avg. Score:5.0 ± 0.0
Reproduced:0 of 1 (0.0%)
From: macabre at fl dot rr dot com Assigned:
Status: Not a bug Package: Feature/Change Request
PHP Version: 4.0.2 OS: Debian/Linux kernel 2.2.17
Private report: No CVE-ID: None
 [2000-09-09 15:01 UTC] 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:


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


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 [2002-01-28 20:05 UTC]
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.

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