CVE-2024-49222: WPGuppy Object Injection Vulnerability

CVE-2024-49222 Overview

CVE-2024-49222 is a deserialization of untrusted data vulnerability affecting the WPGuppy (wpguppy-lite) WordPress plugin developed by AmentoTech Private Limited. This vulnerability allows attackers to perform PHP Object Injection attacks, potentially leading to arbitrary code execution, data manipulation, or complete site compromise depending on the presence of exploitable gadget chains within the WordPress installation.

Critical Impact

PHP Object Injection vulnerabilities can enable attackers to instantiate arbitrary PHP objects with attacker-controlled properties, potentially leading to remote code execution, file deletion, or database manipulation when combined with suitable gadget chains in the application or its dependencies.

Affected Products

• WPGuppy (wpguppy-lite) versions up to and including 1.1.0
• WordPress installations running vulnerable WPGuppy plugin versions

Discovery Timeline

• 2025-01-07 - CVE-2024-49222 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2024-49222

Vulnerability Analysis

This vulnerability stems from insecure deserialization practices within the WPGuppy WordPress plugin. When untrusted user input is passed to PHP's unserialize() function without proper validation or sanitization, attackers can craft malicious serialized payloads that instantiate arbitrary PHP objects. This is classified under CWE-502 (Deserialization of Untrusted Data).

The exploitation potential depends heavily on the availability of "gadget chains" - sequences of existing class methods that can be chained together through PHP magic methods like __wakeup(), __destruct(), or __toString() to achieve malicious outcomes such as file operations, command execution, or database manipulation.

Root Cause

The root cause of CVE-2024-49222 is the direct deserialization of user-controllable data without adequate input validation or use of safer alternatives. The WPGuppy plugin processes serialized data from untrusted sources and passes it directly to PHP's native unserialization mechanism, enabling Object Injection attacks.

Attack Vector

The attack vector involves submitting specially crafted serialized PHP objects to the vulnerable endpoint. An attacker would construct a malicious serialized string containing objects with properties designed to trigger dangerous operations when the object is instantiated or when specific magic methods are invoked during the deserialization lifecycle.

Successful exploitation requires the attacker to identify a suitable gadget chain within the WordPress core, the WPGuppy plugin itself, or other installed plugins and themes. Common gadget chain targets include file handling classes, logging mechanisms, or database abstraction layers that may execute sensitive operations based on object properties.

For technical details on this vulnerability, refer to the Patchstack WordPress Vulnerability Analysis.

Detection Methods for CVE-2024-49222

Indicators of Compromise

• Unusual serialized data patterns in HTTP request parameters, POST bodies, or cookies containing PHP object notation (e.g., O: prefixes indicating objects)
• Web server logs showing requests with serialized payloads targeting WPGuppy plugin endpoints
• Unexpected file modifications or creations in WordPress directories
• Anomalous database queries or modifications originating from WPGuppy plugin contexts

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block serialized PHP objects in user input containing suspicious class names
• Monitor HTTP traffic for requests containing O: patterns followed by numeric values typical of PHP serialization format
• Deploy runtime application self-protection (RASP) solutions to detect unserialization of untrusted data
• Utilize SentinelOne's behavioral detection capabilities to identify post-exploitation activities resulting from successful object injection

Monitoring Recommendations

• Enable verbose logging for the WPGuppy plugin and review logs for unusual deserialization events
• Configure file integrity monitoring for WordPress core files, plugin directories, and theme folders
• Set up alerts for anomalous process spawning from PHP worker processes
• Monitor for unusual outbound network connections from the web server that may indicate successful exploitation and command-and-control communication

How to Mitigate CVE-2024-49222

Immediate Actions Required

• Update WPGuppy plugin to a patched version beyond 1.1.0 when available from the vendor
• Temporarily deactivate the WPGuppy (wpguppy-lite) plugin if no patch is available and the functionality is non-critical
• Implement WAF rules to block requests containing serialized PHP objects targeting known vulnerable endpoints
• Audit your WordPress installation for other plugins that may contain exploitable gadget chains

Patch Information

Review the Patchstack WordPress Vulnerability Analysis for the latest patch status and remediation guidance from the vendor. Ensure you are running a version of WPGuppy beyond 1.1.0 that addresses this PHP Object Injection vulnerability.

Workarounds

• Implement input validation at the application or WAF level to reject serialized PHP objects in user input
• Consider using PHP's allowed_classes parameter with unserialize() to restrict object instantiation to a whitelist (if modifying plugin code)
• Deploy network segmentation to limit the potential impact of successful exploitation
• Restrict WordPress admin and plugin access to trusted IP addresses using .htaccess or server configuration

# Example: Block serialized PHP objects at the Apache level
# Add to .htaccess in WordPress root directory
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{QUERY_STRING} O:[0-9]+: [NC,OR]
    RewriteCond %{REQUEST_BODY} O:[0-9]+: [NC]
    RewriteRule .* - [F,L]
</IfModule>