full-disclosure - [FD] [KIS-2017-02] Tuleap <= 9.6 Second-Order PHP Object Injection Vulnerability

Open Source and information security mailing list archives

Message-ID: <46e966ba-bcd8-36d9-d0ff-97bcaf38267e@karmainsecurity.com>
Date: Mon, 23 Oct 2017 23:13:03 +0200
From: Egidio Romano <research@...mainsecurity.com>
To: bugtraq@...urityfocus.com, fulldisclosure@...lists.org,
 oss-security@...ts.openwall.com
Subject: [FD] [KIS-2017-02] Tuleap <= 9.6 Second-Order PHP Object Injection
 Vulnerability

-------------------------------------------------------------
Tuleap <= 9.6 Second-Order PHP Object Injection Vulnerability
-------------------------------------------------------------

[-] Software Links:

https://www.tuleap.org
https://www.enalean.com

[-] Affected Versions:

All versions from 5.0 to 9.6.

[-] Vulnerability Description:

The vulnerable code can be triggered through the User::getRecentElements() method defined in /src/common/user/User.class.php:

1425.	    public function getRecentElements() {
1426.	        if ($recent_elements = $this->getPreference(self::PREFERENCE_RECENT_ELEMENTS)) {
1427.	            if ($recent_elements = unserialize($recent_elements)) {
1428.	                if (is_array($recent_elements)) {
1429.	                    return $recent_elements;
1430.	                }
1431.	            }
1432.	            //somthing wrong happen. Delete the preference
1433.	            $this->delPreference(self::PREFERENCE_RECENT_ELEMENTS);
1434.	        }
1435.	        return array();
1436.	    }

The vulnerability exists because this method is using the unserialize() function with a value that can be arbitrarily manipulated by a user through
the REST API interface. This can be exploited to inject arbitrary PHP objects into the application scope, and could allow authenticated attackers to
execute arbitrary PHP code via specially crafted serialized objects. Successful exploitation of this vulnerability requires an user account with
permissions to create or access artifacts in a tracker.

[-] Solution:

Update to version 9.7 or later.

[-] Disclosure Timeline:

[03/04/2017] - Vendor notified
[03/04/2017] - Vendor acknowledgement
[03/04/2017] - Vendor submitted artifact: https://tuleap.net/plugins/tracker/?aid=10118
[03/04/2017] - CVE number requested
[03/04/2017] - CVE number assigned
[05/04/2017] - Vulnerability fixed on the git repository: https://goo.gl/X2AT4z
[26/04/2017] - Version 9.7 released
[23/10/2017] - Publication of this advisory

[-] CVE Reference:

The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2017-7411 to this vulnerability.

[-] Credits:

Vulnerability discovered by Egidio Romano.

[-] Original Advisory:

http://karmainsecurity.com/KIS-2017-02

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