CVE-2024-44019: CF7 Campaign Monitor Auth Bypass Flaw

CVE-2024-44019 Overview

CVE-2024-44019 is a Missing Authorization vulnerability affecting the Contact Form 7 Campaign Monitor Extension WordPress plugin developed by Renzo Johnson. This security flaw allows unauthenticated attackers to perform arbitrary file deletion operations on vulnerable WordPress installations without proper authorization checks.

The vulnerability stems from inadequate access control mechanisms within the plugin, enabling remote attackers to delete critical files on the server. This can lead to complete site compromise, denial of service through deletion of essential WordPress files, or serve as a stepping stone for further attacks.

Critical Impact

Unauthenticated attackers can exploit this vulnerability remotely to delete arbitrary files on WordPress installations, potentially leading to complete site takeover or denial of service.

Affected Products

• Contact Form 7 Campaign Monitor Extension versions through 0.4.67
• WordPress installations using the vulnerable plugin versions
• Sites integrating Contact Form 7 with Campaign Monitor email services

Discovery Timeline

• 2024-11-01 - CVE-2024-44019 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2024-44019

Vulnerability Analysis

This vulnerability is classified as CWE-862 (Missing Authorization), indicating that the plugin fails to implement proper authorization checks before performing sensitive file deletion operations. The flaw allows unauthenticated users to access functionality that should be restricted to authorized administrators only.

The arbitrary file deletion capability poses severe risks to WordPress installations. Attackers can target critical configuration files like wp-config.php, which contains database credentials and security keys. Deletion of such files could force WordPress into installation mode, allowing attackers to reconfigure the site with their own credentials. Additionally, deleting essential plugin or theme files can render sites inoperable.

Root Cause

The root cause of this vulnerability is the absence of capability checks and nonce verification in the plugin's file handling functionality. The Contact Form 7 Campaign Monitor Extension fails to validate whether the user initiating file deletion requests has the appropriate WordPress permissions (such as manage_options or administrator privileges) before executing the operation.

Proper WordPress security implementation requires using functions like current_user_can() to verify user capabilities and wp_verify_nonce() to prevent cross-site request forgery. The vulnerable versions of this plugin neglect these critical security measures, exposing the file deletion functionality to any network-accessible attacker.

Attack Vector

The attack can be executed remotely over the network without requiring any authentication or user interaction. An attacker needs only to identify a WordPress site running the vulnerable plugin version and craft malicious requests targeting the file deletion endpoint.

The network-based attack vector combined with no authentication requirements makes this vulnerability particularly dangerous. Attackers can discover vulnerable installations through automated scanning tools that identify WordPress plugins, then exploit them en masse. The exploitation is straightforward and requires low technical skill, as it involves simple HTTP requests to the vulnerable endpoint with the target file path specified.

Detection Methods for CVE-2024-44019

Indicators of Compromise

• Unexpected file deletion events in WordPress directories, particularly wp-config.php or plugin/theme files
• HTTP requests to plugin endpoints with file path parameters from unauthenticated sources
• WordPress sites suddenly entering installation mode without administrator action
• Missing core WordPress files or plugin files without corresponding update activity

Detection Strategies

• Monitor web server access logs for suspicious requests to the Contact Form 7 Campaign Monitor Extension endpoints
• Implement file integrity monitoring on critical WordPress files including wp-config.php, .htaccess, and core directory structures
• Deploy web application firewall rules to detect and block arbitrary file path traversal attempts
• Audit installed WordPress plugins and flag any instances of Contact Form 7 Campaign Monitor Extension version 0.4.67 or earlier

Monitoring Recommendations

• Enable verbose logging on WordPress installations and review for unauthorized plugin endpoint access
• Configure alerting for any modification or deletion of critical WordPress configuration files
• Implement regular file system integrity checks comparing against known-good baselines
• Monitor for WordPress sites unexpectedly entering setup/installation mode

How to Mitigate CVE-2024-44019

Immediate Actions Required

• Immediately update the Contact Form 7 Campaign Monitor Extension to a patched version if available
• If no patch is available, deactivate and remove the plugin from WordPress installations
• Review file system for evidence of exploitation, particularly checking for deleted configuration files
• Implement web application firewall rules to block exploitation attempts while awaiting a permanent fix

Patch Information

Organizations should consult the Patchstack Vulnerability Report for the latest information on available patches and vendor remediation guidance. Check the WordPress plugin repository for updated versions that address this authorization bypass vulnerability.

Workarounds

• Remove or deactivate the Contact Form 7 Campaign Monitor Extension plugin until a patched version is available
• Implement server-level file permission restrictions to prevent web application users from deleting critical files
• Deploy a web application firewall (WAF) with rules to block malicious requests targeting the vulnerable endpoints
• Consider alternative Campaign Monitor integration methods that do not rely on the vulnerable plugin

# Deactivate the vulnerable plugin via WP-CLI
wp plugin deactivate contact-form-7-campaign-monitor-extension

# Verify critical files still exist
ls -la wp-config.php
ls -la .htaccess

# Set restrictive permissions on critical files
chmod 400 wp-config.php
chown root:root wp-config.php