Authorization Bypass in Themeum Tutor LMS

Executive Summary

This vulnerability is an Authorization Bypass Through User-Controlled Key in Themeum Tutor LMS. It allows an attacker to exploit incorrectly configured access control security levels in the Tutor LMS software versions up to 3.9.13.

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Detection Guidance

Detecting this vulnerability requires checking if the affected software, Tutor LMS, is installed on your system and verifying its version. Since this is an Authorization Bypass Through User-Controlled Key vulnerability, you should look for signs of unauthorized access or misconfigured access controls in the plugin.

• Check if Tutor LMS is installed on your WordPress site by navigating to the WordPress admin dashboard, then go to 'Plugins' and search for 'Tutor LMS'.
• Verify the installed version of Tutor LMS. If the version is 3.9.13 or lower, the system is vulnerable.
• Review access logs for unusual activity, such as unauthorized access attempts or unexpected changes to user roles or permissions.
• Use WordPress security plugins or tools to scan for known vulnerabilities in Tutor LMS, such as Patchstack or Wordfence.

No specific commands are provided in the context, but you can use WordPress CLI (WP-CLI) to check the installed version of Tutor LMS with the following command:

• wp plugin list --name=tutor-lms --fields=name,version

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Impact Analysis

The vulnerability can lead to unauthorized actions being performed within the Tutor LMS system because of improper access control. Although it does not impact confidentiality or availability, it can cause a high integrity impact, meaning attackers could modify or manipulate data or functionality they should not have access to.

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Compliance Impact

This vulnerability, an Authorization Bypass Through User-Controlled Key in Tutor LMS, allows unauthorized users to exploit incorrectly configured access control. This can lead to unauthorized access to sensitive data or functionalities within the system.

Under regulations like GDPR (General Data Protection Regulation), this vulnerability could result in non-compliance if it leads to unauthorized access to personal data. GDPR requires strict access controls and protection of personal data, and a breach caused by this vulnerability could result in fines or legal consequences if it is determined that adequate security measures were not in place.

For HIPAA (Health Insurance Portability and Accountability Act), if the affected system handles protected health information (PHI), this vulnerability could lead to unauthorized disclosure of PHI. HIPAA mandates strict access controls and safeguards to protect PHI, and a breach of this nature could result in violations and penalties.

The CVSS vector (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N) indicates that the vulnerability has a high impact on integrity, meaning unauthorized modifications or access could occur. This further emphasizes the risk to compliance with standards that require data integrity and confidentiality.

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Mitigation Strategies

To mitigate this vulnerability, follow these immediate steps:

• Update Tutor LMS to the latest version if a patch is available. Since the vulnerability affects versions up to and including 3.9.13, check for updates in the WordPress plugin repository or the vendor's website.
• If no patch is available, consider disabling the Tutor LMS plugin temporarily until a fix is released.
• Restrict access to the WordPress admin dashboard and Tutor LMS features to trusted users only. Use strong authentication methods, such as two-factor authentication (2FA).
• Monitor user roles and permissions closely to ensure no unauthorized changes have been made. Revoke unnecessary privileges from users.
• Implement a web application firewall (WAF) to block potential exploitation attempts targeting this vulnerability.
• Regularly back up your WordPress site and database to ensure you can restore it in case of an attack.

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