The ElementsKit Lite plugin is an add-on for the WordPress content management system. It allows users to enhance their Elementor page building capabilities with additional widgets and features. This plugin is widely used by web developers and site administrators to create advanced layouts and functionalities without coding knowledge. The primary audience for this plugin includes WordPress site designers, digital marketers, and small to medium-sized businesses looking for customizable design options. The plugin is popular due to its ease of integration with WordPress and compatibility with various themes and other plugins. It supports a range of customizations and is continuously updated to incorporate new elements and improve performance.
The unauthorized admin access vulnerability lies in the unrestricted REST route registered by the ElementsKit Lite plugin. This route allows unauthenticated attackers to issue requests to the Mailchimp API through the hosting WordPress site. Without proper authentication checks, attackers can abuse the website as an open proxy, leading to a range of malicious activities. The vulnerability is critical as it opens opportunities for abusing Mailchimp integration, and possibly for further exploitation. It compromises the security integrity of WordPress sites using any version of the plugin before 3.7.9. Corrective measures are necessary to prevent malicious exploitation of the feature.
Technical details of this vulnerability reveal that the vulnerable endpoint is '/wp-json/elementskit/v1/widget/mailchimp/subscribe'. The parameter potentially exploited is the Mailchimp API credentials, which are accepted without verification. Attackers can invoke this endpoint with crafted requests, leading the website to interact with Mailchimp's servers on behalf of the attacker. It bypasses control mechanisms that would normally safeguard such operations, allowing unauthorized access. Exploitation does not require authentication on the WordPress site, which makes it particularly dangerous for unprotected sites. The vulnerability could lead to the abuse of Mailchimp's resources and manipulation of subscription data.
If exploited, this vulnerability may result in significant consequences including unauthorized use of Mailchimp API quotas and resources. Attackers could manipulate subscription lists and tamper with data sent to Mailchimp, potentially leading to mass spam or phishing campaigns. The hosting site could face severe resource exhaustion or rate-limit issues from Mailchimp due to abuse by the attacker. Unauthorized access can also degrade trust with site users and linked services. Ultimately, the website's integration capabilities are hijacked, posing a risk to its data integrity and operational reliability.
REFERENCES
- Update to the latest version of the ElementsKit Lite plugin, 3.7.9 or later, where authentication on vulnerable endpoints is enforced.
- Review and audit your website plugins for any unauthorized or unusual API requests.
- Implement and thoroughly test access controls to ensure only authenticated users can invoke sensitive operations in all integrated applications.
- Regularly check for plugin updates and revisions to stay protected against future vulnerabilities.
- Utilize a web application firewall (WAF) to help block malicious traffic and unauthorized attempts.
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