CVE-2024-30221: Sunshine Photo Cart Deserialization Flaw

CVE-2024-30221 Overview

CVE-2024-30221 is a critical PHP Object Injection vulnerability affecting the Sunshine Photo Cart plugin for WordPress. This insecure deserialization vulnerability allows unauthenticated attackers to inject malicious serialized PHP objects through user-controlled input, potentially leading to remote code execution, unauthorized data access, or complete site takeover.

Critical Impact

Unauthenticated attackers can exploit this PHP Object Injection vulnerability to achieve remote code execution, manipulate database contents, access sensitive information, or perform arbitrary file operations on vulnerable WordPress installations.

Affected Products

• Sunshine Photo Cart WordPress Plugin versions up to and including 3.1.1
• WordPress sites running vulnerable versions of the sunshine-photo-cart plugin
• E-commerce photography websites utilizing Sunshine Photo Cart for photo sales

Discovery Timeline

• 2024-03-28 - CVE-2024-30221 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2024-30221

Vulnerability Analysis

This vulnerability stems from the unsafe handling of serialized data within the Sunshine Photo Cart plugin. PHP Object Injection occurs when user-supplied input is passed directly to the unserialize() function without proper validation or sanitization. When malicious serialized objects are processed, attackers can leverage existing classes within the WordPress ecosystem (known as "POP chains" or Property-Oriented Programming gadgets) to execute arbitrary code.

The exploitation potential is significant because the attack can be performed remotely over the network without requiring any authentication or user interaction. This allows attackers to target vulnerable WordPress sites at scale with automated exploitation attempts.

Root Cause

The root cause of CVE-2024-30221 is the use of PHP's unserialize() function on untrusted user input without implementing proper input validation, type checking, or using safer alternatives such as json_decode(). The plugin fails to verify the integrity and origin of serialized data before processing, creating a direct path for attackers to inject malicious PHP objects that can manipulate application behavior.

Attack Vector

The attack vector is network-based, requiring no authentication or privileges to exploit. An attacker can craft a malicious serialized PHP object containing references to existing classes in the WordPress core, installed plugins, or themes that have exploitable magic methods (__destruct(), __wakeup(), __toString(), etc.). When the vulnerable plugin deserializes this crafted payload, the magic methods are automatically invoked, executing the attacker's malicious logic.

The exploitation process typically involves:

1. Identifying the vulnerable input parameter that accepts serialized data
2. Discovering available POP gadget chains within the WordPress installation
3. Crafting a serialized payload that chains multiple objects to achieve code execution
4. Submitting the malicious payload to the vulnerable endpoint

For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Advisory.

Detection Methods for CVE-2024-30221

Indicators of Compromise

• Unusual or malformed serialized data patterns in HTTP request logs (look for O:, a:, s: prefix patterns)
• Unexpected PHP errors related to object instantiation or deserialization in error logs
• Evidence of unauthorized file creation, modification, or deletion on the WordPress server
• Suspicious outbound network connections from the web server process

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block serialized PHP object patterns in incoming requests
• Monitor WordPress plugin directories for unexpected file changes or new file creation
• Review web server access logs for requests containing serialized data payloads targeting plugin endpoints
• Deploy endpoint detection solutions capable of identifying PHP Object Injection exploitation attempts

Monitoring Recommendations

• Enable verbose logging on WordPress and PHP to capture detailed request information
• Configure alerts for unusual process spawning or command execution from the web server context
• Monitor database queries for unexpected data modifications or new administrative user creation
• Implement file integrity monitoring on WordPress core files, plugins, and themes directories

How to Mitigate CVE-2024-30221

Immediate Actions Required

• Update Sunshine Photo Cart plugin to a version newer than 3.1.1 that addresses this vulnerability
• If an update is not immediately available, deactivate the Sunshine Photo Cart plugin until a patch is released
• Audit WordPress installations for signs of compromise if the vulnerable plugin version was in use
• Review and restrict file system permissions for the WordPress installation

Patch Information

Organizations should update the Sunshine Photo Cart plugin to the latest available version that remediates CVE-2024-30221. Consult the Patchstack Plugin Vulnerability Detail page for the most current patch information and remediation guidance. Prior to updating in production environments, test the patched version in a staging environment to ensure compatibility with existing site functionality.

Workarounds

• Implement a Web Application Firewall with rules specifically designed to block serialized PHP object patterns in request data
• Use security plugins like Wordfence or Sucuri to add additional protection layers against exploitation attempts
• Restrict access to WordPress admin and plugin endpoints using IP allowlisting where feasible
• Consider temporarily disabling the vulnerable plugin functionality until an official patch is available

# WordPress CLI command to deactivate vulnerable plugin
wp plugin deactivate sunshine-photo-cart

# Verify plugin status
wp plugin list --status=active | grep sunshine

# Check for available plugin updates
wp plugin update --all --dry-run