CVE-2021-4427 in Vuukle Comments, Reactions, Share Bar, Revenue Plugin
Summary
by MITRE • 07/12/2023
The Vuukle Comments, Reactions, Share Bar, Revenue plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 3.4.31. This is due to missing or incorrect nonce validation in the /admin/partials/free-comments-for-wordpress-vuukle-admin-display.php file. This makes it possible for unauthenticated attackers to edit the plugins settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 07/12/2023
The Vuukle Comments plugin for WordPress represents a significant security vulnerability that affects versions up to and including 3.4.31, exposing WordPress sites to cross-site request forgery attacks. This vulnerability stems from inadequate security controls within the plugin's administrative interface, specifically in the file /admin/partials/free-comments-for-wordpress-vuukle-admin-display.php where nonce validation mechanisms are either missing or improperly implemented. The flaw creates a dangerous scenario where unauthenticated attackers can manipulate plugin settings through carefully crafted forged requests, potentially compromising the entire WordPress installation. The vulnerability operates under the principle that administrators may be tricked into executing malicious actions without their knowledge, making it particularly insidious for site owners who may not immediately detect unauthorized configuration changes.
The technical exploitation of this CSRF vulnerability occurs through the manipulation of administrative functions that lack proper nonce verification. When administrators visit malicious websites or click on compromised links, their browsers automatically submit requests to the vulnerable WordPress installation, potentially modifying plugin configurations, altering comment settings, or enabling unauthorized features. This attack vector directly violates the principle of least privilege and undermines the security model of WordPress, where administrative actions should require explicit authentication and authorization. The vulnerability manifests as a failure to implement proper request validation, allowing attackers to bypass the standard authentication mechanisms that should protect administrative functions from unauthorized access. From a cybersecurity perspective, this represents a critical weakness in the plugin's defensive architecture that could lead to broader compromise of the WordPress environment.
The operational impact of this vulnerability extends beyond simple configuration changes, potentially enabling attackers to establish persistent access or manipulate content delivery through the compromised plugin. Administrators may unknowingly approve malicious configurations that could redirect traffic, inject unwanted advertisements, or provide backdoor access points for further exploitation. The vulnerability's effectiveness relies heavily on social engineering tactics that exploit human factors in security, making it particularly dangerous because it requires minimal technical expertise to exploit. Once compromised, the plugin could serve as a launching point for more sophisticated attacks targeting the broader WordPress ecosystem or the underlying server infrastructure. This type of vulnerability is classified as a CWE-352 - Cross-Site Request Forgery, which is categorized under the broader family of web application security flaws that compromise the integrity of user sessions and administrative functions.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security improvements within the WordPress environment. The most critical step involves updating the Vuukle plugin to version 3.4.32 or later, where proper nonce validation has been implemented to prevent unauthorized administrative actions. System administrators should also implement additional security measures such as regular plugin audits, monitoring for unauthorized configuration changes, and maintaining comprehensive backup strategies to quickly recover from potential compromise. Organizations should consider implementing web application firewalls and additional monitoring for suspicious administrative activities that could indicate CSRF exploitation attempts. The vulnerability highlights the importance of proper security testing and validation of administrative interfaces, particularly in third-party plugins that have access to sensitive configuration settings. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence through compromised administrative interfaces, emphasizing the need for layered security approaches that protect against both automated and social engineering attacks targeting WordPress administrative functions.