Release date: April 1, 2003
Name: Integer overflow in PHP str_repeat() function
Versions affected: all versions
Risk: average
Author: Sir Mordred (mordred (at) s-mail (dot) com [email concealed])
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:
This letter has been delivered unencrypted. We'd like to remind you that
the full protection of e-mail correspondence is provided by S-mail
encryption mechanisms if only both, Sender and Recipient use S-mail.
Register at S-mail.com: http://www.s-mail.com
Release date: April 1, 2003
Name: Integer overflow in PHP str_repeat() function
Versions affected: all versions
Risk: average
Author: Sir Mordred (mordred (at) s-mail (dot) com [email concealed])
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.
________________________________________________________________________
This letter has been delivered unencrypted. We'd like to remind you that
the full protection of e-mail correspondence is provided by S-mail
encryption mechanisms if only both, Sender and Recipient use S-mail.
Register at S-mail.com: http://www.s-mail.com
[ reply ]