Exploit the possiblities

GLPI 0.80.61 Local File Inclusion / Remote File Inclusion

GLPI 0.80.61 Local File Inclusion / Remote File Inclusion
Posted Feb 11, 2012
Authored by Emilien Girault

GLPI versions 0.80.61 and below suffer from local file inclusion and remote file inclusion vulnerabilities.

tags | exploit, remote, local, vulnerability, code execution, file inclusion
advisories | CVE-2012-1037
MD5 | 5d7b5ba621c47f937f6a39efa475c467

GLPI 0.80.61 Local File Inclusion / Remote File Inclusion

Change Mirror Download
CVE-2012-1037: GLPI <= 0.80.61 LFI/RFI

Severity: Important

Vendor: GLPI - http://www.glpi-project.org

Versions Affected
=================

All versions between 0.78 and 0.80.61

Description
===========

GLPI fails to properly sanitize the GET 'sub_type' parameter in the front/popup.php file:

[...]
checkLoginUser();

if (isset($_GET["popup"])) {
$_SESSION["glpipopup"]["name"] = $_GET["popup"];
}

if (isset($_SESSION["glpipopup"]["name"])) {
switch ($_SESSION["glpipopup"]["name"]) {
[...]
case "add_ruleparameter" :
popHeader($LANG['ldap'][35], $_SERVER['PHP_SELF']);
include strtolower($_GET['sub_type']."Parameter.php"); // <=======
break;
[...]

To be triggered, the attacker needs to be authenticated. However, GLPI provides default accounts that often aren't changed or disabled:

glpi/glpi
tech/tech
normal/normal
post-only/postonly

Impact
======

Since there is a suffix, the vulnerability can be used as a RFI (requires allow_url_include = On).

For LFI, the target file has to end up with "parameter.php". GLPI automatically escapes all GET and POST parameters with addslashes(), so the null byte technique is not usable. I have not tested exploitation using path truncation technique but it might be possible.


Mitigation
==========

Upgrade to GLPI 0.80.7.


Exploit
=======

http://<server>/front/popup.php?popup=add_ruleparameter&sub_type=<file>


Timeline
========

08 feb 2012 - Found the bug.
09 feb 2012 - Contacted the GLPI Team.
09 feb 2012 - Bug fixed & new version available.

Thanks to the GLPI team for being responsive!

References
==========

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-1037
https://forge.indepnet.net/projects/glpi/versions/685
https://forge.indepnet.net/projects/glpi/repository/revisions/17457/diff/branches/0.80-bugfixes/front/popup.php


--
Emilien Girault

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