Reflected Cross-Site Scripting in EntreDroppers WordPress Plugin

Detection Guidance

This vulnerability can be detected by checking for reflected Cross-Site Scripting (XSS) attempts involving the PHP_SELF parameter in URLs targeting the EntreDroppers WordPress plugin. Specifically, look for URLs containing suspicious script tags or payloads injected into the path-info portion of the URL, such as /wp-admin/admin.php/"><script>alert(0)</script>/?page=EntreDroppers.php.

To detect such attempts on your system or network, you can monitor web server logs for requests containing suspicious script tags or unusual URL patterns targeting the EntreDroppers plugin.

• Use grep or similar tools to search web server access logs for suspicious payloads, for example:
• grep -i "<script>" /var/log/apache2/access.log
• grep -E "admin.php/.+<script>" /var/log/apache2/access.log
• Additionally, you can use curl or wget to test if the vulnerability is present by sending crafted URLs with script payloads in the PHP_SELF parameter and observing if the script is reflected in the response.

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Compliance Impact

The vulnerability allows unauthenticated attackers to inject arbitrary web scripts via reflected cross-site scripting (XSS), which can lead to unauthorized access to user data or session hijacking.

Such security weaknesses can impact compliance with standards like GDPR and HIPAA, which require protection of personal and sensitive data against unauthorized access and attacks.

Failure to mitigate this vulnerability could result in data breaches or exposure of personal information, potentially violating these regulations.

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Executive Summary

The EntreDroppers plugin for WordPress has a Reflected Cross-Site Scripting (XSS) vulnerability in all versions up to and including 1.1.2. This occurs because the plugin does not properly sanitize or escape input from the PHP_SELF parameter. An attacker can craft a malicious URL containing script code in the path-info, which is then reflected directly into the form action attribute on the page. If a user clicks on such a link, the injected script executes in their browser.

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Impact Analysis

This vulnerability allows unauthenticated attackers to inject and execute arbitrary scripts in the context of the affected website. This can lead to theft of user credentials, session hijacking, defacement, or redirection to malicious sites. Because the attack requires tricking a user into clicking a crafted link, it can compromise user trust and the security of user data.

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Mitigation Strategies

Immediate mitigation steps include updating the EntreDroppers WordPress plugin to a version later than 1.1.2 where the vulnerability is fixed.

If an update is not immediately available, consider disabling or removing the EntreDroppers plugin to prevent exploitation.

Additionally, implement Web Application Firewall (WAF) rules to block requests containing suspicious script payloads targeting the PHP_SELF parameter.

Educate users to avoid clicking on suspicious links that may contain malicious payloads exploiting this vulnerability.

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