Executive Summary

This vulnerability is a Cross-Site Request Forgery (CSRF) issue in the Sync Feedly WordPress plugin (up to version 1.0.1). It occurs because the plugin's function responsible for synchronizing content from Feedly (crsf_cron_job_func) lacks proper nonce validation. This means an attacker can trick a site administrator into performing an unwanted action, such as clicking a malicious link, which then triggers the plugin to synchronize content and potentially create multiple posts on the WordPress site without the administrator's intent.

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Impact Analysis

An attacker exploiting this vulnerability can cause unauthorized content synchronization from Feedly to your WordPress site by tricking an administrator into clicking a crafted link. This can lead to the creation of multiple unwanted posts on your site, potentially cluttering your content, confusing users, and damaging your site's integrity or reputation. Since the attacker does not need to be authenticated, the risk is higher if administrators are tricked into performing the action.

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Detection Guidance

This vulnerability can be detected by checking if the Sync Feedly plugin version 1.0.1 or earlier is installed on your WordPress site. Since the issue is a missing or incorrect nonce validation in the crsf_cron_job_func function, you can look for unusual or unauthorized triggering of the content synchronization process. Monitoring HTTP requests to the admin AJAX endpoint that invoke the cron job without proper nonce validation may help detect exploitation attempts. For example, you can use network monitoring tools or web server logs to search for AJAX requests containing 'action=feedly_cron_job' or similar parameters. Additionally, inspecting WordPress logs or database entries in the custom tables (crsf_synced_articles, crsf_test) for unexpected synchronization activity may indicate exploitation. Specific commands depend on your environment, but examples include: 1) Using grep on web server logs: `grep 'feedly_cron_job' /var/log/apache2/access.log` 2) Using WP-CLI to check installed plugin versions: `wp plugin list --status=active | grep sync-feedly` 3) Monitoring AJAX requests with tools like tcpdump or Wireshark filtering HTTP POST requests to admin-ajax.php. [1]

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Mitigation Strategies

Immediate mitigation steps include: 1) Updating the Sync Feedly plugin to a version later than 1.0.1 if available, where the nonce validation issue is fixed. 2) If no update is available, temporarily deactivate or uninstall the Sync Feedly plugin to prevent exploitation. 3) Restrict access to the WordPress admin area and AJAX endpoints to trusted users only. 4) Implement additional security measures such as Web Application Firewalls (WAF) to block unauthorized requests attempting to trigger the cron job. 5) Monitor your site for suspicious activity related to content synchronization and review the custom database tables for unexpected entries. These steps help prevent unauthenticated attackers from triggering the synchronization process via forged requests. [1]

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