CVE-2024-35665: Insert Post Ads Auth Bypass Vulnerability

CVE-2024-35665 Overview

CVE-2024-35665 is a Missing Authorization vulnerability affecting the WordPress Insert Post Ads plugin developed by namithjawahar. This broken access control flaw allows unauthorized users to perform actions that should be restricted to authenticated administrators. The vulnerability stems from missing capability checks on sensitive plugin functionality, enabling attackers to manipulate plugin settings or content without proper authorization.

Critical Impact

Unauthorized users can bypass access controls and perform administrative actions on WordPress sites using the Insert Post Ads plugin, potentially leading to unauthorized content modification or site compromise.

Affected Products

• Insert Post Ads plugin versions from n/a through 1.3.2
• WordPress installations using vulnerable versions of Insert Post Ads

Discovery Timeline

• 2024-06-11 - CVE-2024-35665 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-35665

Vulnerability Analysis

This vulnerability is classified under CWE-862 (Missing Authorization), which occurs when a software application does not perform authorization checks before allowing access to a resource or functionality. In the context of WordPress plugins, this typically manifests when AJAX handlers, REST API endpoints, or administrative functions fail to verify that the requesting user has appropriate capabilities before executing privileged operations.

The Insert Post Ads plugin is designed to help WordPress administrators insert advertisements within post content. The plugin provides functionality to configure ad placements, manage ad content, and control display settings. The vulnerability allows unauthenticated or low-privileged users to access and manipulate these features without proper authorization verification.

Root Cause

The root cause of CVE-2024-35665 is the absence of proper capability checks (such as current_user_can() checks) and nonce verification in plugin functions that handle sensitive operations. WordPress plugins are expected to implement authorization checks before processing requests that modify settings or content. When these checks are omitted, any user—including unauthenticated visitors—can invoke these functions by directly calling the exposed endpoints.

Attack Vector

The attack vector for this vulnerability is network-based and requires no user interaction. An attacker can exploit this flaw remotely by sending crafted HTTP requests to the vulnerable plugin endpoints. The attack does not require authentication, meaning any remote attacker with network access to the WordPress installation can potentially exploit this vulnerability.

The exploitation process typically involves:

1. Identifying WordPress sites running vulnerable versions of Insert Post Ads
2. Crafting HTTP requests targeting unprotected plugin functions
3. Submitting requests to modify plugin settings or inject unauthorized ad content
4. Achieving unauthorized modifications to the target website's advertising configuration

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

Detection Methods for CVE-2024-35665

Indicators of Compromise

• Unexpected changes to Insert Post Ads plugin settings without administrator action
• Unauthorized ad content appearing in posts that administrators did not configure
• Unusual HTTP POST requests targeting Insert Post Ads plugin endpoints in web server logs
• Suspicious AJAX requests to admin-ajax.php with Insert Post Ads action parameters

Detection Strategies

• Monitor WordPress audit logs for changes to Insert Post Ads plugin configuration made by non-administrator users
• Implement web application firewall (WAF) rules to detect and block suspicious requests targeting plugin endpoints
• Regularly review plugin settings for unauthorized modifications
• Use WordPress security plugins that monitor for unauthorized configuration changes

Monitoring Recommendations

• Enable detailed access logging on web servers hosting WordPress installations
• Configure alerts for HTTP requests to sensitive plugin endpoints from unauthenticated sessions
• Implement file integrity monitoring to detect unauthorized changes to plugin files
• Review server logs for patterns of automated scanning or exploitation attempts targeting WordPress plugins

How to Mitigate CVE-2024-35665

Immediate Actions Required

• Update the Insert Post Ads plugin to the latest available version that addresses this vulnerability
• Temporarily disable the Insert Post Ads plugin if an update is not immediately available
• Review plugin settings and ad configurations for any unauthorized modifications
• Audit user accounts and access logs for signs of compromise

Patch Information

Check the WordPress plugin repository for updated versions of Insert Post Ads that address this authorization bypass vulnerability. Plugin updates that include proper capability checks and nonce verification should resolve CVE-2024-35665. Always test updates in a staging environment before deploying to production WordPress installations.

For detailed vulnerability information and remediation guidance, see the Patchstack Vulnerability Report.

Workarounds

• Disable the Insert Post Ads plugin until a patched version is available
• Implement server-level access controls to restrict access to plugin AJAX handlers
• Use a Web Application Firewall (WAF) to block unauthorized requests to vulnerable endpoints
• Consider using alternative advertising plugins with proper authorization controls until this issue is resolved

# WordPress CLI command to disable the vulnerable plugin
wp plugin deactivate insert-post-ads

# Verify plugin status
wp plugin status insert-post-ads

# Check for available updates
wp plugin update insert-post-ads --dry-run