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Review the release notes for your Drupal version if you have issues accessing files or image styles after updating. Some sites may require configuration changes following this security release. The recommended and default setting is FALSE, and Drupal core does not provide a way to change that in the admin UI. This vulnerability is mitigated by the fact that it only applies when the site sets (Drupal 9) $config or (Drupal 7) $conf to TRUE. However, some contributed modules provide additional file systems, or schemes, which may lead to this vulnerability. Access to a non-public file is checked only if it is stored in the "private" file system. Installatron is a service available in OIT Web Hosting that (among other things) can keep the core of your Drupal site automatically updated with security. In some situations, the Image module does not correctly check access to image files not stored in the standard public files directory when generating derivative images using the image styles system. If you do not require or expect redirects to be followed, one should simply disable redirects all together. Users unable to upgrade may consider an alternative approach to use your own redirect middleware, rather than ours. Affected users using any earlier series of Guzzle should upgrade to Guzzle 6.5.7 or 7.4.4. Affected Guzzle 7 users should upgrade to Guzzle 7.4.4 as soon as possible. We now always strip it, and allow the cookie middleware to re-add any cookies that it deems should be there. Prior to this fix, only cookies that were managed by our cookie middleware would be safely removed, and any `Cookie` header manually added to the initial request would not be stripped. On making a request using the `https` scheme to a server which responds with a redirect to a URI with the `http` scheme, or on making a request to a server which responds with a redirect to a a URI to a different host, we should not forward the `Cookie` header on. In affected versions the `Cookie` headers on requests are sensitive information.
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Guzzle is an open source PHP HTTP client. Alternately users may simply disable redirects all together if redirects are not expected or required. Users unable to upgrade may consider an alternative approach which would be to use their own redirect middleware. Prior to this fix, `https` to `http` downgrades did not result in the `Authorization` header being removed, only changes to the host. After your updates complete, disable maintenance mode. Select the themes or modules you want to update, and then click Download these updates. In your web browser, enter your website URL followed by /update.php. This is much the same as to how we don't forward on the header if the host changes. Use an FTP client to upload the updates to your Drupal codebase. On making a request using the `https` scheme to a server which responds with a redirect to a URI with the `http` scheme, we should not forward the `Authorization` header on. In affected versions `Authorization` headers on requests are sensitive information.