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XSS in Rustici Software SCORM Engine

Medium

Synopsis

Tenable discovered a cross-site scripting (XSS) vulnerability in the playerConfUrl parameter of the Scorm/Rustici Engine interface /defaultui/player/modern.html page. This XSS vulnerability could be leveraged by an attacker to achieve full account takeover against cloud.scorm.com users, and could affect any other LMS which integrates this page, with varying impact.

The issue appears to occur as a result of the call to loadCode(playerConfigurationurl,false) in /defaultui/src/js/integration/loader.js, as playerConfigurationUrl is user-defined and has no limitations in terms of what domain it loads code from, or what kind of URI it accepts. As a result an attacker could craft a malicious link which loads a malicious javascript file from an external site, or uses a data: uri to pass javascript directly.

Proof of Concept:

As Rustici has fixed these issues, the following proof of concept

https://[app-using-scorm]/[path-to-scorm-files]/defaultui/player/modern.html?playerConfUrl=data:text,alert(document.domain)//

Solution

Update to SCORM engine 20.1.45.914+ or 21.1.7.219+

Disclosure Timeline

9 March, 2022 - Tenable requests a security contact for Rustici Software
9 March, 2022 - Rustici responds, indicating the issue can be reported to support
10 March, 2022 - Tenable reports the issue details to Rustici
10 March, 2022 - Rustici confirms the issue
6 April, 2022 - Rustici informs Tenable that the issue had been fixed in 21.1.7.219, released prior to Tenable's report.
6 April, 2022 - Rustici indicates they are still working on upgrading SCORM Cloud and addressing the issue for versions < v21
6 June, 2022 - Tenable notices that the issue appears to have been fixed in SCORM Cloud, requests an update, reminds Rustici of June 8th 90-day disclosure date
6 June, 2022 - Rustici confirms that SCORM Cloud has been upgraded to the latest engine version, and that the fix has been backported to Engine 20.1.
6 June, 2022 - Rustici requests that more time be allowed before disclosure, for other LMS who integrate SCORM into their product to upgrade versions
7 June, 2022 - Tenable informs Rustici that the 90-day disclosure date is final and that an advisory will be published on June 8th.

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

CVE ID: CVE-2022-2035
Tenable Advisory ID
TRA-2022-21
Credit
Evan Grant
CVSSv3 Base / Temporal Score
6.1
CVSSv3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected Products
SCORM Engine 21.1.x < 21.1.7.219
SCORM Engine < 20.1.45.914
Risk Factor
Medium

Advisory Timeline

8 June 2022 - Advisory published
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