Fat Free CRM vulnerable to Remote Denial of Service via Tasks endpoint

Impact

An authenticated user can perform a remote Denial of Service attack against
Fat Free CRM.

This vulnerability has been assigned the CVE identifier: CVE-2022-39281

Affected versions: All
Not affected: None
Fixed versions: 0.20.1

All users running an affected release should either upgrade or apply the patch
immediately.

Releases

Fixed versions: 0.20.1 and above

Patches

If you are unable to upgrade immediately, you should apply the following
patch.

diff --git a/app/models/polymorphic/task.rb b/app/models/polymorphic/task.rb
index d3d5c32c..7cdb24d6 100644
--- a/app/models/polymorphic/task.rb
+++ b/app/models/polymorphic/task.rb
@@ -189,6 +189,7 @@ class Task < ActiveRecord::Base
   #----------------------------------------------------------------------------
   def self.bucket_empty?(bucket, user, view = "pending")
     return false if bucket.blank? || !ALLOWED_VIEWS.include?(view)
+    return false unless Setting.task_bucket.map(&:to_s).include?(bucket.to_s)

     if view == "assigned"
       assigned_by(user).send(bucket).pending.count