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Date: Thu, 27 Jun 2013 09:41:37 +0200
From: "Mehrenberger, Xavier" <Xavier.Mehrenberger@...sidian.com>
To: <oss-security@...ts.openwall.com>
Subject: CVE request for GLPI
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Hello,
I'd like to request a CVE identifier for a vulnerability in GLPI.
The unserialize() function was used in several places throughout the
codebase;
one CVE identifier should (IMHO) be sufficient.
It has been publicly fixed in the project's repository.
Thanks
=======================================
Advisory title: unserialize vulnerability in GLPI 0.83.9
Product: GLPI 0.83.9
Discovered by: Xavier Mehrenberger @Cassidian CyberSecurity
Vulnerable version: 0.83.9
Tested: v0.83.9, 2013-06-21
Fixed in repository: 2013-06-23 commits 21169 to 21180
Category: Potential PHP code execution
Vulnerability type: [CWE-502] Deserialization of Untrusted Data
CVE IDs: none yet
By: Xavier Mehrenberger
Cassidian CyberSecurity
http://www.cassidiancybersecurity.com
=======================================
- ----- CVE-2013-XXXX Required configuration: No specific configuration
required
Steps to reproduce:
* Issue a request to
glpi/front/ticket.form.php?id=1&_predefined_fields=XXXX,
* replacing XXX with a serialized PHP object
Vulnerable code sample:
- --- file ticket.class.php, function showFormHelpdesk
if (isset($options['_predefined_fields'])) {
$options['_predefined_fields']
=
unserialize(rawurldecode(stripslashes($options['_predefined_fields'])));
- ---
When passing a non-existent empty serialized class (ex: class called
"exploit"
value "O%3A7%3A%22exploit%22%3A0%3A%7B%7D"), an error occurs, which is
caught
by the userErrorHandlerNormal function in toolbox.class.php.
When a PHP object gets unserialized, its __wakeup() function is
executed. When
this object gets destroyed, its __destruct() function is executed (since
PHP5).
No such object exists throughout the GLPI codebase. However, it might
exist in
a third-party library, as demonstrated by Stefan Esser [2].
More information about this vulnerability class can be found at [1].
The unsafe use of unserialize() has been fixed throughout the codebase
in commits
21169 [3] to 21180.
References:
[1] https://www.owasp.org/index.php/PHP_Object_Injection
[2]
http://www.suspekt.org/downloads/POC2009-ShockingNewsInPHPExploitation.p
df part II
[3]
https://forge.indepnet.net/projects/glpi/repository/revisions/21169/diff
/branches/0.83-bugfixes/inc/ticket.class.php
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