Cross-Site Request Forgery in Bulk SEO Image WordPress Plugin

Detection Guidance

This vulnerability involves a Cross-Site Request Forgery (CSRF) attack targeting the Bulk SEO Image plugin's settings page handler when a POST request contains the parameter 'bulkseoimage'. Detection can focus on monitoring for suspicious POST requests to the plugin's settings page that include this parameter.

To detect potential exploitation attempts on your system or network, you can monitor web server logs for POST requests containing 'bulkseoimage' in the request body targeting the plugin's endpoint.

• Use command-line tools like grep to search web server logs for suspicious POST requests: grep -i 'bulkseoimage' /var/log/apache2/access.log
• Use network monitoring tools such as tcpdump or Wireshark to capture and filter HTTP POST requests containing 'bulkseoimage'. For example: tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep 'bulkseoimage'

Additionally, reviewing WordPress plugin versions installed on your site to confirm if they are at or below version 1.1 can help identify vulnerable installations.

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Executive Summary

The Bulk SEO Image plugin for WordPress has a Cross-Site Request Forgery (CSRF) vulnerability in versions up to and including 1.1. This happens because the plugin's settings page handler does not properly validate nonces, which are security tokens meant to verify the authenticity of requests.

Specifically, the plugin does not emit a nonce field in its form and does not check the nonce before bulk-overwriting the ALT-text metadata of images attached to published posts or pages. This allows an attacker to trick a site administrator into performing an unwanted action, such as clicking a malicious link, which then causes the attacker to overwrite image ALT-text metadata across the site.

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Impact Analysis

This vulnerability allows an unauthenticated attacker to bulk-overwrite the ALT-text metadata of images on a WordPress site by tricking an administrator into clicking a malicious link.

While it does not affect confidentiality or availability, it impacts the integrity of the site's image metadata, potentially leading to misinformation or SEO manipulation.

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Mitigation Strategies

To mitigate this vulnerability, you should update the Bulk SEO Image plugin to a version later than 1.1 where the nonce validation issue is fixed.

Additionally, ensure that any forms handling sensitive actions implement proper nonce fields (wp_nonce_field()) and verify nonces (check_admin_referer() or wp_verify_nonce()) to prevent Cross-Site Request Forgery attacks.

Until an update is applied, restrict access to the plugin's settings page to trusted administrators only and avoid clicking on suspicious links that could trigger forged requests.

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