Executive Summary

The login_register plugin for WordPress is vulnerable to a Cross-Site Request Forgery (CSRF) attack that leads to Stored Cross-Site Scripting (XSS) in all versions up to and including 1.2.0.

This vulnerability exists because the plugin's settings page lacks nonce validation, which is a security token used to verify that requests are intentional and legitimate.

Additionally, the plugin does not properly sanitize or escape the 'login_register_login_post' parameter, allowing attackers to inject arbitrary web scripts.

An unauthenticated attacker can exploit this by tricking an administrator into performing an action, such as clicking a malicious link, which causes the injected script to be stored and executed whenever the affected page is accessed.

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Impact Analysis

This vulnerability can allow an attacker to execute arbitrary scripts in the context of the affected website when an administrator interacts with a crafted request.

Such script execution can lead to unauthorized actions being performed with administrator privileges, potentially compromising the website's security and integrity.

Because the attacker can inject scripts that run in the administrator's browser, this may lead to theft of sensitive information, session hijacking, or further exploitation of the site.

The vulnerability requires user interaction (an administrator clicking a link), but no authentication is needed for the attacker to initiate the attack.

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Compliance Impact

I don't know

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Detection Guidance

I don't know

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'To mitigate the vulnerability in the login_register WordPress plugin (versions up to and including 1.2.0), immediate steps include ensuring that the plugin is updated to a version that includes nonce validation and proper input sanitization and output escaping.'}, {'type': 'paragraph', 'content': 'Additionally, enabling CAPTCHA protection on the plugin\'s control forms can help reduce automated attacks, as the plugin\'s admin interface suggests integration with the "Really Simple CAPTCHA" plugin.'}, {'type': 'paragraph', 'content': 'Administrators should also be cautious about clicking on suspicious links or performing actions triggered by untrusted sources, as the vulnerability allows unauthenticated attackers to inject scripts that execute when an admin accesses a crafted page.'}] [2]

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