44 lines
2.2 KiB
Plaintext
44 lines
2.2 KiB
Plaintext
External requests initiated by a WordPress server should be considered as security-sensitive. They may contain sensitive data which is stored in the files or in the database of the server. It's important for the administrator of a WordPress server to understand what they contain and to which server they are sent.
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WordPress makes it possible to block external requests by setting the `WP_HTTP_BLOCK_EXTERNAL` option to `true`. It's then possible to authorize requests to only a few servers using another option named `WP_ACCESSIBLE_HOSTS`.
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== Ask Yourself Whether
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* Your WordPress website contains code which may call external requests to servers you don't know.
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* Your WordPress website may send sensitive data to other servers.
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* Your WordPress website uses a lot of plugins or themes.
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There is a risk if you answered yes to any of those questions.
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== Recommended Secure Coding Practices
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* Uninstall WordPress plugins which send requests to servers you don't know.
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* Make sure that `WP_HTTP_BLOCK_EXTERNAL` is defined in `wp-config.php`.
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* Make sure that `WP_HTTP_BLOCK_EXTERNAL` is set to `true`.
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* Make sure that `WP_ACCESSIBLE_HOSTS` is configured to authorize requests to the servers you trust.
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== Sensitive Code Example
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----
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define( 'WP_HTTP_BLOCK_EXTERNAL', false ); // Sensitive
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----
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== Compliant Solution
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[source,php]
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----
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define( 'WP_HTTP_BLOCK_EXTERNAL', true );
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define( 'WP_ACCESSIBLE_HOSTS', 'api.wordpress.org' );
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----
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== See
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* https://owasp.org/Top10/A05_2021-Security_Misconfiguration/[OWASP Top 10 2021 Category A5] - Security Misconfiguration
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* https://owasp.org/Top10/A10_2021-Server-Side_Request_Forgery_%28SSRF%29/[OWASP Top 10 2021 Category A10] - Server-Side Request Forgery (SSRF)
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* https://wordpress.org/support/article/editing-wp-config-php/#block-external-url-requestsl[wordpress.org] - Block External URL Requests
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* https://owasp.org/www-project-top-ten/2017/A6_2017-Security_Misconfiguration.html[OWASP Top 10 2017 Category A6] - Security Misconfiguration
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* https://owasp.org/www-community/attacks/Server_Side_Request_Forgery[OWASP Attack Category] - Server Side Request Forgery
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* https://cwe.mitre.org/data/definitions/918[MITRE, CWE-918] - Server-Side Request Forgery (SSRF)
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