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Strikingly CMS Prototype Pollution

Medium

Synopsis

A researcher at Tenable discovered a prototype pollution vulnerability in Strikingly CMS which can result in reflected cross-site scripting (XSS) in affected applications. 

The vulnerability exists because of Strikingly JavaScript library parsing the URL fragment allows access to the __proto__ or constructor properties and the Object prototype. By leveraging an embedded gadget like jQuery, an attacker who convinces a victim to visit a specially crafted link could achieve arbitrary javascript execution in the context of the user's browser. 


Proof of concept :

https://[strikingly-website]/#__proto__[context]=%3Cimg%2Fsrc%2Fonerror%3Dalert(document.domain)%3E&__proto__[jquery]=x

Solution

No fix or solution is currently available

Disclosure Timeline

February 8, 2023 - Tenable reports the issue to Strikingly and receives an automated response
March 22, 2023 - Tenable requests an update and receives an automated response
March 22, 2023 - Tenable reaches out to other offices at Strikingly and is eventually directed to a vulnerability report web form. Tenable supplies a detailed account of the vulnerability through this web form. Strikingly sends an automated response to ac
May 8, 2023 - Tenable makes a final effort to speak to a human being at Strikingly, by both email and a customer support chat, and is assured that the vulnerability report will reach Strikingly’s developers.

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-2023-2582
Tenable Advisory ID: TRA-2023-18
Credit:
Rémy Marot
CVSSv3 Base / Temporal Score:
6.1/6.0
CVSSv3 Vector:
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:U/RC:C
Affected Products:
Strikingly CMS
Risk Factor:
Medium

Advisory Timeline

May 8, 2023 - Initial Release

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