CVE-2020-8417 in Code Snippets Plugin
Summary
by MITRE
The Code Snippets plugin before 2.14.0 for WordPress allows CSRF because of the lack of a Referer check on the import menu.
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Analysis
by VulDB Data Team • 03/27/2024
The Code Snippets plugin for WordPress prior to version 2.14.0 contained a critical cross-site request forgery vulnerability that exploited a fundamental security oversight in the plugin's import functionality. This vulnerability specifically affected the import menu handler which failed to implement proper referer validation checks, creating an avenue for malicious actors to execute unauthorized administrative actions on vulnerable WordPress installations. The flaw existed within the plugin's security architecture where legitimate administrative operations could be hijacked through crafted malicious requests that appeared to originate from the legitimate admin interface.
This vulnerability falls under the category of cross-site request forgery as defined by CWE-352, where an attacker could trick an authenticated administrator into performing unintended actions within the WordPress environment. The absence of referer validation represents a classic security misconfiguration that violates fundamental web application security principles. The import functionality in question was designed to allow administrators to load code snippets from external sources, but the lack of proper validation meant that any authenticated user session could be exploited to perform import operations without explicit user consent or awareness.
The operational impact of this vulnerability was significant as it allowed attackers to execute arbitrary code snippets on vulnerable WordPress sites, potentially leading to complete compromise of the affected systems. An attacker could craft malicious requests that would import and execute harmful code snippets, effectively granting them administrative privileges or enabling further exploitation such as data exfiltration, site defacement, or the installation of backdoors. The vulnerability was particularly dangerous because it required no authentication from the attacker beyond the ability to trick an existing administrator into visiting a malicious page, making it a serious concern for WordPress administrators who might be targeted through social engineering or phishing attacks.
The security implications extended beyond simple code execution as this vulnerability could be leveraged as a stepping stone for more sophisticated attacks within the WordPress ecosystem. Attackers could use the imported code snippets to modify existing functionality, create persistent backdoors, or establish command and control channels. The vulnerability was particularly concerning in environments where multiple administrators had access to the WordPress installation, as it could be exploited to escalate privileges or perform actions that would otherwise require explicit administrative consent. This weakness aligned with attack patterns described in the mitre attack framework under the category of privilege escalation and persistence techniques.
The recommended mitigation for this vulnerability involved immediate upgrading to version 2.14.0 or later of the Code Snippets plugin, which included proper referer validation and nonce checks to prevent unauthorized import operations. Additionally, administrators should implement additional security measures such as restricting access to the WordPress admin interface through IP whitelisting, implementing multi-factor authentication, and regularly auditing plugin installations and updates. The vulnerability also highlighted the importance of proper input validation and the implementation of security controls such as the use of anti-CSRF tokens and referer header checks, which are fundamental requirements for secure web application development practices and align with security standards such as those outlined in the owasp top ten project.