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

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


From: Egidio Romano <research () karmainsecurity com>
Date: Tue, 30 Jun 2020 15:25:06 +0200


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openSIS <= 7.4 Incorrect Access Control Vulnerabilities
------------------------------------------------------- [-] Software Link: https://opensis.com/ [-] Affected Versions: Version 7.4 and prior versions. [-] Vulnerabilities Description: 

The application prevents unauthenticated access to its functionalities by including the 'RedirectIncludes.php', 'RedirectModules.php', and 'RedirectRootInc.php' scripts,

which implement the access control logic by using the following code: 

if(!$_SESSION['STAFF_ID'] && !$_SESSION['STUDENT_ID'] && strpos($_SERVER['PHP_SELF'],'index.php')===false)

{ header('Location: ../../../index.php'); exit;
} 

This can be easily bypassed by appending /index.php at the end of the URL, and can be exploited by unauthenticated attackers to potentially access any application

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

[20/01/2020] - Told the vendor they could use the PoC I sent them in November [05/02/2020] - Vendor asked for a video recording to demonstrate the vulnerabilities

[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: http://karmainsecurity.com/KIS-2020-06 _______________________________________________
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