PHP Local File Inclusion in Nuss

Executive Summary

The vulnerability is a Local File Inclusion (LFI) issue in the WordPress Nuss Theme, versions 1.3.6 and below. It allows attackers to include and display local files from the target website by improperly controlling the filename used in PHP include or require statements.

This means an attacker with contributor-level privileges can exploit this flaw to access sensitive files on the server, such as configuration files or database credentials, if the server configuration permits.

The vulnerability is classified under OWASP Top 10 A3: Injection and has a CVSS v3.1 base score of 7.5, indicating a high severity impact.

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Detection Guidance

Detecting this Local File Inclusion (LFI) vulnerability in the Nuss WordPress theme (versions <= 1.3.6) requires checking for signs of exploitation or misconfigurations that could allow file inclusion. Below are some methods and commands to help identify potential issues.

• Check the installed version of the Nuss theme: Verify if your WordPress site is running a vulnerable version (<= 1.3.6). You can do this by navigating to the WordPress admin dashboard, going to 'Appearance' > 'Themes', and checking the version number of the Nuss theme.
• Review web server logs for suspicious requests: Look for HTTP requests containing patterns like '?file=', '?page=', or other parameters that might be used to include local files. Example command to search Apache logs: grep -i 'file=\|page=\|include=' /var/log/apache2/access.log
• Check for unusual file access: Monitor for unexpected file reads, such as attempts to access /etc/passwd, wp-config.php, or other sensitive files. Example command to monitor file access: grep -i '/etc/passwd\|wp-config.php' /var/log/apache2/access.log
• Use a vulnerability scanner: Tools like WPScan can scan your WordPress site for known vulnerabilities, including this LFI issue. Example command: wpscan --url yourwebsite.com --enumerate vp,vt
• Manually test for LFI: If you have contributor-level access, you can attempt to exploit the vulnerability by crafting a request to include a local file, such as: curl 'http://yourwebsite.com/wp-content/themes/nuss/?file=../../../../etc/passwd'. Note: Only perform this in a controlled environment with permission.

If you detect the vulnerability, immediately update the Nuss theme or seek assistance from your hosting provider or web developer, as no official patch is currently available.

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Impact Analysis

Exploitation of this vulnerability can lead to unauthorized access to sensitive local files on the web server hosting the vulnerable WordPress Nuss Theme.

This can expose critical information such as database credentials, configuration files, or other sensitive data, potentially leading to further compromise of the website or server.

Because the vulnerability requires contributor-level privileges, an attacker who has gained such access can leverage this flaw to escalate their impact.

The vulnerability is often exploited in mass campaigns targeting many websites, increasing the risk of widespread impact.

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Compliance Impact

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

Under GDPR, the exposure of sensitive data (e.g., database credentials or personal information) due to this vulnerability could lead to violations of data protection principles. GDPR requires organizations to implement appropriate technical measures to protect personal data. If this vulnerability is exploited to access or exfiltrate personal data, it may result in non-compliance, potential fines, and mandatory breach notifications.

For HIPAA, if the affected system processes or stores protected health information (PHI), this vulnerability could lead to unauthorized access to PHI. HIPAA mandates safeguards to ensure the confidentiality, integrity, and availability of PHI. Exploitation of this vulnerability could violate these requirements, leading to penalties and corrective action plans.

• Risk of data breaches: The vulnerability allows attackers to access local files, which may include sensitive information such as configuration files, credentials, or user data.
• Regulatory reporting obligations: If a breach occurs due to this vulnerability, organizations may be required to report the incident to regulatory bodies and affected individuals under GDPR or HIPAA.
• Lack of official patch: Since no official patch is available, organizations may struggle to mitigate the risk promptly, increasing the likelihood of non-compliance.

Additionally, the vulnerability is classified under OWASP Top 10 A3: Injection, which is a well-known security risk. Failure to address such risks may indicate inadequate security practices, further complicating compliance efforts.

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Mitigation Strategies

The WordPress Nuss Theme versions 1.3.6 and below are affected by a Local File Inclusion vulnerability.

Users are advised to update the theme immediately to a version above 1.3.6 if available.

If no official patch is available, seek assistance from your hosting provider or web developer to apply mitigations.

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