CVE-2022-2446 in WP Editor Plugin
Summary
by MITRE • 09/13/2024
The WP Editor plugin for WordPress is vulnerable to deserialization of untrusted input via the 'current_theme_root' parameter in versions up to, and including 1.2.9. This makes it possible for authenticated attackers with administrative privileges to call files using a PHAR wrapper that will deserialize and call arbitrary PHP Objects that can be used to perform a variety of malicious actions granted a POP chain is also present. It also requires that the attacker is successful in uploading a file with the serialized payload.
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Analysis
by VulDB Data Team • 09/27/2024
The vulnerability identified as CVE-2022-2446 affects the WP Editor plugin for WordPress, specifically targeting versions up to and including 1.2.9. This represents a critical security flaw that exploits the plugin's handling of untrusted input through the 'current_theme_root' parameter, creating a pathway for authenticated attackers to execute arbitrary code on affected systems. The vulnerability resides in the plugin's deserialization process, which fails to properly validate or sanitize input data before processing, allowing malicious actors to inject serialized PHP objects that can be executed within the WordPress environment.
The technical implementation of this vulnerability involves the manipulation of the PHAR (PHP Archive) wrapper functionality within the WordPress plugin ecosystem. When an authenticated administrator interacts with the plugin's functionality, the 'current_theme_root' parameter becomes a vector for exploitation. The deserialization process occurs without adequate input validation, enabling attackers to craft serialized PHP objects that, when processed, trigger arbitrary code execution. This type of vulnerability falls under the CWE-502 category, specifically addressing "Deserialization of Untrusted Data" which is a well-documented weakness in software security architectures. The attack requires the presence of a POP (Property-Oriented Programming) chain to effectively leverage the deserialization flaw, demonstrating the sophisticated nature of modern exploitation techniques.
The operational impact of this vulnerability is severe and far-reaching for WordPress administrators and system operators. An attacker with administrative privileges can leverage this vulnerability to upload malicious files containing serialized payloads, which then get deserialized and executed within the WordPress environment. This capability enables a wide range of malicious actions including but not limited to arbitrary code execution, privilege escalation, data exfiltration, and potential system compromise. The requirement for administrative access limits the scope of exploitation but does not eliminate the danger, as administrators often have elevated privileges and access to sensitive system resources. This vulnerability directly aligns with ATT&CK technique T1059.007, which covers "Command and Scripting Interpreter: PowerShell," though the actual execution occurs through PHP object deserialization rather than PowerShell directly.
The exploitation process requires careful crafting of serialized PHP objects that can be successfully deserialized and executed within the target environment. Attackers must first gain administrative access to a WordPress site, then successfully upload a malicious file containing their serialized payload. The vulnerability's effectiveness depends on the presence of a suitable POP chain within the WordPress codebase or plugin dependencies, which allows attackers to chain together multiple object methods to achieve their desired malicious outcomes. Security professionals should note that this vulnerability represents a classic example of how seemingly benign input handling can create critical security risks, particularly in web applications that process user-provided data without proper sanitization. The combination of authentication requirements with deserialization flaws creates a particularly dangerous attack surface that requires immediate remediation through plugin updates and proper input validation measures.