CVE-2020-11514 in Rank Math Plugin
Summary
by MITRE
The Rank Math plugin through 1.0.40.2 for WordPress allows unauthenticated remote attackers to update arbitrary WordPress metadata, including the ability to escalate or revoke administrative privileges for existing users via the unsecured rankmath/v1/updateMeta REST API endpoint.
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Analysis
by VulDB Data Team • 05/17/2024
The vulnerability identified as CVE-2020-11514 affects the Rank Math plugin version 1.0.40.2 and earlier, representing a critical security flaw within the WordPress ecosystem. This issue stems from an insecure REST API endpoint that lacks proper authentication mechanisms, allowing unauthenticated attackers to exploit the system and manipulate WordPress metadata. The vulnerability specifically targets the rankmath/v1/updateMeta endpoint which is designed to handle metadata updates within the WordPress environment. The flaw creates a pathway for malicious actors to perform unauthorized modifications to user privileges and system configurations without requiring valid credentials or administrative access.
The technical implementation of this vulnerability demonstrates a clear violation of access control principles, where the REST API endpoint fails to validate user authentication status before processing metadata update requests. This represents a classic case of insufficient authentication checks, which maps directly to CWE-287 - Improper Authentication. The endpoint accepts requests containing metadata parameters that can modify user roles, permissions, and other critical system attributes. Attackers can leverage this vulnerability to escalate privileges of existing users to administrator level or revoke existing administrative privileges, fundamentally compromising the security posture of affected WordPress installations. The flaw exists due to improper input validation and authorization mechanisms within the plugin's REST API implementation.
The operational impact of this vulnerability extends beyond simple metadata manipulation, creating significant risks for WordPress site administrators and their users. An unauthenticated attacker can exploit this vulnerability to gain unauthorized administrative access to compromised sites, potentially leading to complete system takeover. The ability to escalate or revoke administrative privileges means that attackers can either assume control of the WordPress administration interface or remove legitimate administrators from their roles, creating persistent security threats. This vulnerability affects not just individual user accounts but can compromise entire WordPress installations, potentially leading to data breaches, defacement, or the deployment of malicious content. The impact is particularly severe because it requires no prior authentication credentials, making it accessible to any attacker with knowledge of the affected plugin version.
Mitigation strategies for CVE-2020-11514 should prioritize immediate patching of the Rank Math plugin to version 1.0.40.3 or later, which contains the necessary security fixes. System administrators should also implement network-level restrictions to limit access to the affected REST API endpoints, particularly by blocking direct access to the rankmath/v1/updateMeta endpoint from external networks. The implementation of additional authentication layers and monitoring of REST API access patterns can help detect potential exploitation attempts. Security teams should conduct comprehensive audits of all installed WordPress plugins to identify similar vulnerabilities and ensure that all REST API endpoints properly validate authentication status. According to ATT&CK framework, this vulnerability aligns with T1078 - Valid Accounts and T1548.001 - Abuse Elevation Control Mechanisms, as attackers can leverage it to gain elevated privileges and maintain persistent access to compromised systems. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability.