full-disclosure - [FD] [KIS-2015-08] ATutor <= 2.2 (edit_marks.php) PHP Code Injection Vulnerability

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Message-ID: <563A19FD.8020206@karmainsecurity.com>
Date: Wed, 04 Nov 2015 15:45:17 +0100
From: Egidio Romano <research@...mainsecurity.com>
To: bugtraq@...urityfocus.com, fulldisclosure@...lists.org
Subject: [FD] [KIS-2015-08] ATutor <= 2.2 (edit_marks.php) PHP Code
	Injection Vulnerability

---------------------------------------------------------------
ATutor <= 2.2 (edit_marks.php) PHP Code Injection Vulnerability
---------------------------------------------------------------

[-] Software Link:

http://www.atutor.ca/

[-] Affected Versions:

Version 2.2 and prior versions. 	

[-] Vulnerability Description:

The vulnerable code is located in the /mods/_standard/gradebook/edit_marks.php script:

54.	if (isset($_GET['asc']))
55.	{
56.	    $order = 'asc';
57.	    $order_col = $addslashes($_GET['asc']);
58.	}
59.	else if (isset($_GET['desc'])) {
60.	    $order = 'desc';
61.	    $order_col = $addslashes($_GET['desc']);

[...]

185.	if ((isset($_GET["asc"]) || isset($_GET["desc"])) && $order_col <> "name")
186.	{
187.	    $sort = '$grades['.$order_col.'], SORT_'.strtoupper($order).', $selected_students ...
188.	
189.	    foreach($selected_tests as $test)
190.	    {
191.	        if ($test["gradebook_test_id"] <> $order_col)
192.	            $sort .= ', $grades['.$test["gradebook_test_id"].'], SORT_'.strtoupper($order);
193.	    }
194.	    $sort='array_multisort('.$sort.');';
195.	    eval($sort);
196.	}

User input passed through the "asc" or "desc" GET parameters is not properly sanitized before being used in a
call to the "eval()" function at line 195. This can be exploited to inject and execute arbitrary PHP code.
Successful exploitation of this vulnerability requires an account with the "AT_PRIV_GRADEBOOK" privilege.

[-] Solution:

No official solution is currently available.

[-] Disclosure Timeline:

[06/10/2014] - Vendor notified
[09/10/2014] - Vendor response stating this issue has been added to the bug tracker and it is relatively minor
[13/10/2014] - Vendor replied saying he is not able to reproduce the issue and asked for further details
[29/10/2014] - Further exploitation details have been provided to the vendor
[11/11/2014] - Vendor replied saying he still is not able to reproduce the issue and asked for fix suggestions
[11/11/2014] - Some fix suggestions have been provided to the vendor
[30/09/2015] - CVE number requested
[05/10/2015] - CVE number assigned
[06/10/2015] - After one year still no official solution available
[04/11/2015] - Public disclosure

[-] CVE Reference:

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2015-7712 to this vulnerability.

[-] Credits:

Vulnerability discovered by Egidio Romano.

[-] Original Advisory:

http://karmainsecurity.com/KIS-2015-08

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