Improper File Upload in Improve SEO WordPress Plugin

Executive Summary

This vulnerability exists in the Improve SEO WordPress plugin version 2.0.11 or earlier. It fails to properly validate uploaded files, only checking the content type while saving the file with the attacker's chosen extension in a public directory. This allows unauthenticated users to upload PHP files that can execute code remotely.

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Detection Guidance

Check for uploaded PHP files in publicly accessible directories like /wp-content/uploads/. Look for files with unexpected extensions or recent uploads from unauthenticated users.

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Impact Analysis

An attacker could exploit this to upload malicious PHP files to your server. These files could then execute arbitrary commands, potentially allowing the attacker to take full control of your WordPress site, steal data, or use your server for further attacks.

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Compliance Impact

This vulnerability could lead to data breaches, which may violate GDPR or HIPAA requirements for data protection and security. Organizations could face fines or penalties if this flaw results in unauthorized access to personal or sensitive health information.

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Mitigation Strategies

Update the Improve SEO WordPress plugin to the latest version. Remove any suspicious PHP files from upload directories. Implement strict file upload validation to block executable files.

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