DOM-Based XSS in reCAPTCHA for Asgaros Forum

Executive Summary

This vulnerability is a Cross Site Scripting (XSS) issue in the WordPress reCAPTCHA (v2 & v3) for Asgaros Forum Plugin, versions 1.1.0 and below.

It allows attackers to inject malicious scripts into web pages generated by the plugin. These scripts can execute in the browsers of visitors to the affected site.

The vulnerability is DOM-Based XSS, meaning the malicious script is executed as a result of modifying the Document Object Model (DOM) in the victim's browser.

Exploitation requires a privileged user to perform an action such as clicking a malicious link or submitting a form.

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Detection Guidance

This vulnerability involves Cross Site Scripting (XSS) in the reCAPTCHA (v2 & v3) for Asgaros Forum plugin versions 1.1.0 and below. Detection typically involves monitoring for suspicious script injections or unusual behavior triggered by privileged users interacting with the forum.

Since the vulnerability requires a privileged user to click a malicious link or submit a form, network or system detection can focus on identifying such suspicious inputs or script execution attempts.

Specific commands are not provided in the available resources, but general approaches include using web application scanners to detect XSS vulnerabilities or monitoring web server logs for unusual input patterns or script injections.

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Impact Analysis

If exploited, this vulnerability can allow attackers to execute malicious scripts on your website, which could lead to unauthorized redirects, display of unwanted advertisements, or other malicious activities.

This can compromise the security and integrity of your website and negatively affect your users' experience and trust.

Because the vulnerability requires a privileged user to trigger it, it could be used in targeted attacks or mass campaigns if such users are tricked.

The vulnerability has a moderate severity with a CVSS score of 6.5.

Updating to version 1.1.1 or applying mitigation rules is recommended to prevent exploitation.

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Compliance Impact

This vulnerability, a DOM-Based Cross-Site Scripting (XSS) issue, can impact compliance with standards and regulations like GDPR and HIPAA due to its potential to expose sensitive data or allow unauthorized actions.

• GDPR: The vulnerability could lead to unauthorized access to user data or session hijacking, violating GDPR's requirements for data protection and confidentiality (Articles 5, 25, and 32). If exploited, it may result in data breaches, triggering mandatory reporting obligations under Article 33.
• HIPAA: For organizations handling protected health information (PHI), this vulnerability could compromise the integrity and confidentiality of PHI, violating HIPAA's Security Rule (45 CFR Part 164, Subpart C). Exploitation could lead to unauthorized access or disclosure of PHI, requiring breach notifications under the HIPAA Breach Notification Rule (45 CFR Part 164, Subpart D).

Additionally, the CVSS score of 6.5 indicates a moderate risk, which may require organizations to address the vulnerability promptly to maintain compliance with security best practices and regulatory expectations.

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Mitigation Strategies

The immediate recommended step is to update the reCAPTCHA (v2 & v3) for Asgaros Forum plugin to version 1.1.1 or later, where the vulnerability is patched.

Until the update can be applied, applying the mitigation rule issued by Patchstack to block attacks targeting this vulnerability is advised.

Additionally, limiting privileged user interactions with untrusted links or forms can reduce the risk of exploitation.

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