CVE-2021-4423 in RAYS Grid Plugin
Summary
by MITRE • 07/12/2023
The RAYS Grid plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.2.2. This is due to missing or incorrect nonce validation on the rsgd_insert_update() function. This makes it possible for unauthenticated attackers to update post fields 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 • 07/30/2023
The vulnerability identified as CVE-2021-4423 affects the RAYS Grid plugin for WordPress, specifically impacting versions up to and including 1.2.2. This represents a critical security flaw that undermines the integrity of WordPress site administration by exploiting a fundamental weakness in the plugin's request validation mechanisms. The vulnerability resides within the rsgd_insert_update() function which fails to implement proper nonce validation, creating an exploitable condition that allows malicious actors to manipulate content without proper authentication. This type of vulnerability directly violates core web application security principles and represents a significant risk to WordPress site owners who rely on the plugin for grid-based content management.
The technical implementation flaw stems from the absence of proper cryptographic token validation within the plugin's administrative functions. Nonces serve as time-based tokens that verify the authenticity of requests and prevent unauthorized modifications to WordPress content. When the rsgd_insert_update() function lacks proper nonce verification, it creates an opening for attackers to craft malicious requests that appear legitimate to the WordPress system. This vulnerability operates under the principle that administrators must be protected from social engineering attacks that could lead them to inadvertently execute malicious actions. The flaw allows attackers to bypass standard authentication mechanisms by leveraging the trust relationship between the WordPress admin interface and legitimate plugin functions, making it particularly dangerous as it requires only minimal user interaction to exploit.
The operational impact of this CSRF vulnerability extends beyond simple content manipulation to potentially compromise entire WordPress installations. Attackers can exploit this weakness to modify post fields, alter content, or potentially inject malicious code that could lead to further compromise of the site. The vulnerability's unauthenticated nature means that no prior access or credentials are required to attempt exploitation, making it particularly attractive to threat actors seeking to target WordPress sites. This type of vulnerability aligns with CWE-352, which specifically addresses Cross-Site Request Forgery flaws in web applications, and represents a direct violation of the principle that administrative functions should require explicit authorization before execution. The attack vector relies heavily on social engineering tactics where administrators are tricked into clicking malicious links or visiting compromised websites, making it difficult to defend against through traditional network monitoring approaches.
Mitigation strategies for this vulnerability require immediate action from affected site administrators, beginning with the immediate upgrade of the RAYS Grid plugin to a version that properly implements nonce validation. The recommended approach involves updating to the latest available version that addresses the specific nonce validation issue within the rsgd_insert_update() function. Additionally, administrators should implement enhanced monitoring of administrative actions and consider implementing additional security layers such as two-factor authentication for administrative accounts. The vulnerability demonstrates the critical importance of proper input validation and authentication checks in web applications, particularly those handling administrative functions. Organizations should also consider implementing web application firewalls that can detect and block suspicious request patterns that may indicate CSRF attempts. This vulnerability serves as a reminder of the necessity for regular security audits and the importance of keeping all WordPress plugins updated to address known security flaws. The remediation process should include thorough testing to ensure that the updated plugin functions correctly without introducing new issues, while also verifying that proper nonce validation has been implemented across all administrative functions.