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Reflected Cross-Site Scripting in AYS Popup Box WordPress Plugin

Medium
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Synopsis

A researcher at Tenable discovered an unauthenticated reflected cross-site scripting (XSS) vulnerability in the AYS Popup Box WordPress plugin.

The XSS vulnerability exists in the 'upgrade_plugin' parameter of the 'deactivate_plugin_option_pb' action, as the parameter is reflected in the response without prior filtering with a Content-Type header of text/html.

The vulnerable code was present in the function 'deactivate_plugin_option()' of the file 'admin/class-ays-pb-admin.php'.

Proof of Concept:

Any user visiting the following link, where wordpress.tld is the instance of wordpress with the plugin installed, will trigger the reflected XSS payload:  

http://wordpress.tld/wp-admin/admin-ajax.php?action=deactivate_plugin_option_pb&upgrade_plugin=<svg%20onload=alert(document.domain)>

Solution

The issue was fixed in AYS Popup Box version 3.6.3

Additional References

https://wordpress.org/plugins/ays-popup-box/

Disclosure Timeline

11 July 2023 - Issue reported
13 July 2023 - Issue fixed in version 3.6.3

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-2023-4137
Tenable Advisory ID: TRA-2023-26
Credit:
Joshua Martinelle
CVSSv3 Base / Temporal Score:
6.1
CVSSv3 Vector:
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected Products:
AYS Popup Box WordPress Plugin < 3.6.3
Risk Factor:
Medium

Advisory Timeline

3 August 2023 - Initial advisory published
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