openSIS 7.4 Incorrect Access Control

2020.07.01
Credit: EgiX
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-269


CVSS Base Score: 6.4/10
Impact Subscore: 4.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: None

------------------------------------------------------- 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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