Improper File Inclusion in Billey WordPress Theme

Executive Summary

The WordPress Billey Theme, specifically versions up to and including 2.1.8, contains a Local File Inclusion (LFI) vulnerability. This flaw allows an attacker to include local files from the target website through improper control of filename parameters in PHP include or require statements. Exploiting this vulnerability can expose sensitive data such as database credentials.

The vulnerability is classified under OWASP A3: Injection and requires contributor-level privileges to exploit.

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Detection Guidance

This vulnerability is a Local File Inclusion (LFI) flaw in the WordPress Billey Theme up to version 2.1.8, which allows attackers to include local files from the target website.

Detection typically involves checking for suspicious requests that attempt to include local files via URL parameters or POST data in the web server logs.

Common detection methods include searching for patterns in web server access logs that contain file inclusion attempts, such as requests with parameters including "../" sequences or references to sensitive files like /etc/passwd.

Example commands to detect such attempts on a Linux system include:

• grep -i 'include' /var/log/apache2/access.log | grep '\.php'
• grep -E '\.\./|etc/passwd|php://filter' /var/log/apache2/access.log
• tail -f /var/log/apache2/access.log | grep -i 'billey'

Additionally, scanning the website files for the vulnerable theme version (<= 2.1.8) can help identify if the vulnerable code is present.

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Impact Analysis

Exploiting this Local File Inclusion vulnerability can lead to exposure of sensitive information like database credentials. Depending on the server configuration, this could escalate to a full database takeover.

The vulnerability has a CVSS score of 7.5, indicating a moderate risk, and while considered low severity, it can be exploited in mass campaigns targeting many websites.

Immediate action such as updating the theme or consulting a hosting provider or web developer is recommended to mitigate potential impacts.

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Compliance Impact

This vulnerability, a Local File Inclusion (LFI) flaw in the Billey theme, can significantly impact compliance with standards and regulations like GDPR and HIPAA.

• GDPR: The vulnerability may expose sensitive personal data stored in local files, such as database credentials or user information. Unauthorized access to such data violates GDPR's data protection principles (Article 5) and could lead to breaches requiring notification under Article 33. Failure to protect personal data may result in fines up to 4% of global revenue or €20 million, whichever is higher.
• HIPAA: If the affected system processes or stores protected health information (PHI), the vulnerability could lead to unauthorized disclosure of PHI. This violates the HIPAA Privacy Rule (45 CFR Part 164) and Security Rule (45 CFR Part 164, Subpart C). Covered entities may face penalties ranging from $100 to $50,000 per violation, with a maximum of $1.5 million per year for identical violations.
• General compliance risks: The vulnerability falls under OWASP's A3: Injection category, which is a critical security risk. Many compliance frameworks (e.g., PCI DSS, ISO 27001) require protection against injection attacks. Failure to address this vulnerability may result in non-compliance with these frameworks.

Organizations using the Billey theme should prioritize remediation to avoid regulatory penalties and maintain compliance with data protection laws.

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Mitigation Strategies

Immediate mitigation steps include updating the WordPress Billey Theme to a version higher than 2.1.8 if available.

Since no official patch is currently available, it is recommended to seek assistance from your hosting provider or a web developer to apply temporary fixes or workarounds.

Other mitigation measures include restricting file inclusion permissions, disabling remote file inclusion in PHP configurations, and implementing web application firewall (WAF) rules to block suspicious requests.

Monitoring logs for exploitation attempts and limiting contributor-level privileges can also reduce the risk of exploitation.

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