CVE-2024-9265: Echo RSS Feed Privilege Escalation Flaw

CVE-2024-9265 Overview

CVE-2024-9265 is a critical privilege escalation vulnerability affecting the Echo RSS Feed Post Generator plugin for WordPress. The vulnerability exists in all versions up to and including 5.4.6. Due to improper role restriction during user registration through the echo_check_post_header_sent() function, unauthenticated attackers can register accounts with administrator privileges, gaining complete control over affected WordPress installations.

Critical Impact

Unauthenticated attackers can register as administrators, leading to complete WordPress site takeover with full administrative access to content, users, plugins, and server-side execution capabilities.

Affected Products

• Echo RSS Feed Post Generator plugin for WordPress versions up to and including 5.4.6
• WordPress installations running vulnerable versions of the Echo RSS Feed Post Generator plugin
• Coderevolution Echo RSS Feed Post Generator

Discovery Timeline

• 2024-10-01 - CVE-2024-9265 published to NVD
• 2024-10-07 - Last updated in NVD database

Technical Details for CVE-2024-9265

Vulnerability Analysis

This privilege escalation vulnerability stems from insufficient access control during the user registration process. The echo_check_post_header_sent() function fails to properly validate and restrict the user roles that can be assigned when a new account is created. This architectural flaw allows unauthenticated users to specify elevated role parameters during registration requests, effectively bypassing the intended security controls that should limit new accounts to subscriber-level access.

WordPress relies on proper role enforcement to maintain separation between different user permission levels. When a plugin handles registration without adequately sanitizing or restricting the role parameter, attackers can manipulate the registration request to assign themselves the "administrator" role instead of the default subscriber role.

Root Cause

The root cause is classified under CWE-269 (Improper Privilege Management). The plugin's echo_check_post_header_sent() function does not implement proper authorization checks to validate whether the requesting user has permission to assign specific roles during registration. The function accepts user-supplied role values without verification, trusting that only legitimate values will be submitted.

Attack Vector

The attack vector is network-based, requiring no authentication, no user interaction, and presenting low attack complexity. An attacker can exploit this vulnerability remotely by sending a crafted HTTP request to the WordPress registration endpoint with manipulated role parameters.

The exploitation flow involves:

1. Identifying a WordPress site running the vulnerable Echo RSS Feed Post Generator plugin
2. Crafting a registration request that includes administrator role assignment
3. Submitting the malicious registration payload to the target site
4. Gaining immediate administrator access upon successful account creation

This grants the attacker full administrative capabilities including plugin installation, theme modification, user management, and potential remote code execution through the WordPress admin interface.

Detection Methods for CVE-2024-9265

Indicators of Compromise

• Unexpected administrator accounts appearing in WordPress user database
• New user registrations with administrator role where only subscriber registrations should occur
• Unusual HTTP POST requests to registration endpoints containing role manipulation parameters
• Audit logs showing administrator account creation without corresponding legitimate administrative action

Detection Strategies

• Monitor WordPress user creation events for unexpected administrator-level registrations
• Implement web application firewall rules to detect and block role parameter manipulation in registration requests
• Review access logs for suspicious registration activity targeting the Echo RSS Feed Post Generator plugin endpoints
• Deploy endpoint detection to identify post-compromise activities such as malicious plugin uploads or file modifications

Monitoring Recommendations

• Enable WordPress audit logging to track all user registration and role assignment events
• Configure alerts for new administrator account creation events
• Monitor for unauthorized changes to WordPress configuration files and database tables
• Implement file integrity monitoring on critical WordPress directories

How to Mitigate CVE-2024-9265

Immediate Actions Required

• Update the Echo RSS Feed Post Generator plugin to a version newer than 5.4.6 if a patch is available
• Audit all WordPress administrator accounts and remove any unauthorized entries
• Disable user registration temporarily if the plugin cannot be updated immediately
• Review recent user registrations for suspicious activity and revoke access as needed

Patch Information

Organizations should consult the Wordfence Vulnerability Report for detailed patch information and remediation guidance. The plugin is available through CodeCanyon where updates may be obtained. Verify that any applied update addresses the privilege escalation issue in the echo_check_post_header_sent() function.

Workarounds

• Disable the Echo RSS Feed Post Generator plugin until a patched version is available
• Implement web application firewall rules to block registration requests with manipulated role parameters
• Restrict WordPress registration functionality at the server level if not required for site operations
• Use security plugins to enforce strict role assignment policies and block unauthorized privilege escalation attempts

# Disable user registration in WordPress wp-config.php as temporary mitigation
# Add the following line to wp-config.php to disable registration
define('DISALLOW_FILE_EDIT', true);

# Alternatively, disable registration via WordPress settings
# Navigate to Settings > General and uncheck "Anyone can register"

# Use WP-CLI to audit administrator accounts
wp user list --role=administrator --format=table