[29604] in bugtraq
@(#)Mordred Labs advisory - Integer overflow in PHP str_repeat() function
daemon@ATHENA.MIT.EDU (Sir Mordred)
Wed Apr 2 16:54:59 2003
Message-ID: <3e898645.64960c7a@s-mail.com>
Date: Tue, 01 Apr 2003 12:29:57 +0000
From: Sir Mordred <mordred@s-mail.com>
To: bugtraq@securityfocus.com
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//@(#) Mordred Security Labs advisory
Release date: April 1, 2003
Name: Integer overflow in PHP str_repeat() 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 str_repeat(string input, int multiplier) returns input
repeated multiplier times.
The implementation of this function suffers from a simple 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 illustrate this vulnerability:
$ cat t.php
<?php
str_repeat(str_repeat("A", 0x2000), 0x40000000);
?>
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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