[KIS-2020-06] openSIS <= 7.4 Incorrect Access Control Vulnerabilities

                							

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<h1 class="m-title">[KIS-2020-06] openSIS &lt;= 7.4 Incorrect Access Control	Vulnerabilities</h1>
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<em>From</em>: Egidio Romano &lt;research () karmainsecurity com&gt;


<em>Date</em>: Tue, 30 Jun 2020 15:25:06 +0200


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<pre style="margin: 0em;">-------------------------------------------------------
openSIS &lt;= 7.4 Incorrect Access Control Vulnerabilities
-------------------------------------------------------


[-] Software Link:

<a rel="nofollow" href="https://opensis.com/">https://opensis.com/</a>


[-] Affected Versions:

Version 7.4 and prior versions.


[-] Vulnerabilities Description:

</pre><tt>The application prevents unauthenticated access to its functionalities 
</tt><tt>by including
</tt><tt>the 'RedirectIncludes.php', 'RedirectModules.php', and 
</tt><tt>'RedirectRootInc.php' scripts,
</tt><pre style="margin: 0em;">which implement the access control logic by using the following code:

</pre><tt>if(!$_SESSION['STAFF_ID'] &amp;&amp; !$_SESSION['STUDENT_ID'] &amp;&amp; 
</tt><tt>strpos($_SERVER['PHP_SELF'],'index.php')===false)
</tt><pre style="margin: 0em;">{
    header('Location: ../../../index.php');
    exit;
}

</pre><tt>This can be easily bypassed by appending /index.php at the end of the 
</tt><tt>URL, and can
</tt><tt>be exploited by unauthenticated attackers to potentially access any 
</tt><tt>application
</tt><pre style="margin: 0em;">functionality which should require the user to be authenticated.


[-] Solution:

No official solution is currently available.


[-] Disclosure Timeline:

[04/11/2019] - Vendor notified
[04/11/2019] - Vendor acknowledgement
[10/01/2020] - Vendor contacted again asking for updates
[15/01/2020] - Vendor replied they would need a few examples
</pre><tt>[20/01/2020] - Told the vendor they could use the PoC I sent them in 
</tt><tt>November
</tt><tt>[05/02/2020] - Vendor asked for a video recording to demonstrate the 
</tt><tt>vulnerabilities
</tt><pre style="margin: 0em;">[06/02/2020] - Proof of Concept video sent to the vendor
[03/03/2020] - Vendor contacted again asking for updates
[04/03/2020] - Vendor replied "we just have to wait a little longer"
[25/04/2020] - Version 7.4 released, vulnerabilities still not fixed
[22/05/2020] - CVE number assigned
[30/06/2020] - Public disclosure


[-] CVE Reference:

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2020-13382 to these vulnerabilities.


[-] Credits:

Vulnerabilities discovered by Egidio Romano.


[-] Original Advisory:

<a rel="nofollow" href="http://karmainsecurity.com/KIS-2020-06">http://karmainsecurity.com/KIS-2020-06</a>

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<h3 class="m-thread">Current thread:</h3>
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<li><strong>[KIS-2020-06] openSIS &lt;= 7.4 Incorrect Access Control	Vulnerabilities</strong> <em>Egidio Romano (Jun 30)</em>
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