@(#)Mordred Labs advisory - Integer overflow in PHP array_pad() function

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//@(#) Mordred Security Labs advisory

Release date: April 1, 2003
Name: Integer overflow in PHP array_pad() function Versions affected: all versions
Risk: average
Author: Sir Mordred (mordred@s-mail.com)

I. Description:

PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. Please visit http://www.php.net for more information about PHP.

II. Details:

The function array_pad(array input, int pad_size, mixed pad_value) returns a copy
of the input padded to size specified by pad_size with pad_value.

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Unfortunately the implementation of this function suffers from an integer overflow caused by
a very long second argument and could allow a local/remote attacker in the worst case
to gain control over the web server.

The following short script will cause a httpd child to die:

$ cat t.php
<?php

    array_pad(array(1,2,3), 0x40000003, "pad");
?>

III. Platforms tested

Linux 2.4 with Apache 1.3.27 / PHP 4.3.1

IV. Vendor response

Vendor has been contacted.

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In addition to our free technical library, Pantek provides professional IT services to companies who utilize Open Source software: Learn more about Pantek's Technical Support offerings Place an order for 24/7/365 Technical Support here Learn more about Pantek, who we are, and what we do Chat with a Live Operator Related securityfocus.com Links bugtraq certification focus-bsd focus-ids focus-ih focus-linux focus-ms focus-sun focus-unix-other focus-virus forensics incidents libnet linux-secnews ms-secnews pen-test secpapers secprog sectools secureshell security-basics securityjobs sf-news vuln-dev webappsec Request more information about Pantek

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Big $$$ to be made with the HushMail Affiliate Program: https://www.hushmail.com/about.php?subloc=affiliate&l=427 Received on Thu Apr 3 12:40:22 2003