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https://issues.apache.org/jira/browse/SOLR-14014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16990166#comment-16990166
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Jan Høydahl commented on SOLR-14014:
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If you have direct HTTP access to a Solr server, you cannot do anything less or
more if you choose to let the browser JS client (also called Admin UI) call
those HTTP APIs than if you do it with cURL or another client.
The risk with XSS etc is if you manage to sneak some hostile code into the
browser of a Solr administrator that is already logged in to the Admin UI in
his browser - then you could possibly attack his Solr cluster. Or if he is
logged in to Solr Admin and falls for a phishing attack and clicks an email
that opens some location in the Admin UI that would execute some destructive
action on the cluster.
+1 for UI enabled by default but add a flag to disable it, and add
documentation about potential risks, possibly the welcome text in the UI.
> Allow Solr to start with Admin UI disabled
> ------------------------------------------
>
> Key: SOLR-14014
> URL: https://issues.apache.org/jira/browse/SOLR-14014
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Admin UI, security
> Affects Versions: master (9.0), 8.3.1
> Reporter: Jason Gerlowski
> Priority: Major
>
> Currently Solr always runs the Admin UI. With the history of XSS issues and
> other security concerns that have been found in the Admin UI, Solr should
> offer a mode where the Admin UI is disabled. Maybe, and this is a topic
> that'll need some serious discussion, this should even be the default when
> Solr starts.
> NOTE: Disabling the Admin UI removes XSS and other attack vectors. But even
> with the Admin UI disabled, Solr will still be inherently unsafe without
> firewall protection on a public network.
> *Proposed design:*
> A java system property called *headless* will be used as an internal flag for
> starting Solr in headless mode. This property will default to true. A java
> property can be used at startup to set this flag to false.
> Here is an example:
> {code:java}
> bin/solr start -Dheadless=false {code}
> A message will be added following startup describing the mode.
> In headless mode the following message will be displayed:
> "solr is running in headless mode. The admin console is unavailable. To to
> turn off headless mode and allow the admin console use the following
> parameter startup parameter:
> -Dheadless=false
>
> In non-headless mode the following message will be displayed:
> "solr is running with headless mode turned off. The admin console is
> available in this mode. Disabling the Admin UI removes XSS and other attack
> vectors"
> If a user attempts to access the admin console while Solr is in headless mode
> it Solr will return 401 unauthorized.
>
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