CVE-2018-20972 in companion-auto-update Plugin
Summary
by MITRE
The companion-auto-update plugin before 3.2.1 for WordPress has CSRF.
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Analysis
by VulDB Data Team • 11/26/2023
The CVE-2018-20972 vulnerability affects the companion-auto-update plugin for WordPress systems prior to version 3.2.1, representing a critical cross-site request forgery flaw that compromises the integrity of automated update mechanisms. This vulnerability specifically targets the plugin's update functionality, which is designed to automatically manage and deploy security patches for WordPress installations. The flaw exists in how the plugin handles update requests, failing to implement proper anti-CSRF protection measures that would normally validate the authenticity of user-initiated actions. Attackers can exploit this weakness by crafting malicious web pages that trigger unauthorized update operations when unsuspecting administrators visit compromised websites, effectively allowing remote code execution or system compromise through automated update processes.
The technical implementation of this vulnerability stems from the plugin's failure to validate the referer header or implement token-based authentication for update requests. In WordPress environments, automated update systems typically require strict verification mechanisms to prevent unauthorized modifications to core files or plugin configurations. The companion-auto-update plugin's inadequate CSRF protection means that any authenticated user session can be hijacked to perform unauthorized update operations without proper user consent or validation. This flaw aligns with CWE-352, which specifically addresses Cross-Site Request Forgery vulnerabilities in web applications. The vulnerability operates at the application layer, exploiting the trust relationship between the web application and its users, making it particularly dangerous in environments where administrators frequently access multiple websites.
The operational impact of this vulnerability extends beyond simple unauthorized updates, potentially allowing attackers to escalate privileges or inject malicious code into WordPress installations. When administrators perform routine administrative tasks on compromised sites, their browsers may inadvertently trigger update operations that modify critical system files or plugin configurations. This creates a significant risk for WordPress installations that rely on automated update mechanisms, particularly in enterprise environments where multiple administrators access the same systems. The vulnerability is especially concerning because it operates silently in the background, with no immediate user feedback indicating unauthorized modifications. According to ATT&CK framework technique T1059, this vulnerability could enable command execution through compromised update mechanisms, while T1078 addresses the potential for privilege escalation through authenticated sessions.
Mitigation strategies for CVE-2018-20972 require immediate patching of the companion-auto-update plugin to version 3.2.1 or later, which implements proper CSRF token validation and referer header checks. Organizations should also implement additional security controls such as web application firewalls that can detect and block suspicious update requests, while monitoring for unauthorized modifications to plugin files. Network administrators should consider implementing strict access controls that limit which users can perform update operations, and establish regular integrity checks to detect unauthorized modifications to WordPress core files and plugins. Security teams should also conduct comprehensive vulnerability assessments to identify other plugins or themes that may suffer from similar CSRF vulnerabilities, as the issue demonstrates a pattern of inadequate security implementation in WordPress plugin ecosystems. The remediation process should include thorough testing of the updated plugin to ensure that legitimate update operations continue to function properly while preventing exploitation of the CSRF vulnerability.