Solidus is a free, open-source ecommerce platform built on Rails. Versions of Solidus prior to 3.1.4, 3.0.4, and 2.11.13 have a denial of service vulnerability that could be exploited during a guest checkout. The regular expression used to validate a guest order's email was subject to exponential backtracking through a fragment like `a.a.` Versions 3.1.4, 3.0.4, and 2.11.13 have been patched to use a different regular expression. The maintainers added a check for email addresses that are no longer valid that will print information about any affected orders that exist. If a prompt upgrade is not an option, a workaround is available. It is possible to edit the file `config/application.rb` manually (with code provided by the maintainers in the GitHub Security Advisory) to check email validity.
Affected: RubyGems: solidus_core
### Impact Denial of service vulnerability that could be exploited during a guest checkout. The regular expression used to validate a guest order's email was subject to exponential backtracking through a fragment like `a.a.`.
Before the patch, it can be reproduced in the console like this:
```ruby irb(main)> Spree::EmailValidator::EMAIL_REGEXP.match "a@a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.a.@" processing time: 54.293660s => nil ```
To reproduce in the browser, fill in the "Customer Email" field with that fake email address during a guest checkout. Before that, you should open the browser dev tools and change the `type` attribute for that field from `email` to `text`. After entering a fake address and pressing the "Save & Continue" button, the browser will take a long term to perform the request before showing an error message for the invalid address. Eventually, making the email string even longer could lead to the exhaustion of server resources.
### Patches Versions 3.1.4, 3.0.4, and 2.11.13 have been patched to use a different regular expression.
There's an improbable chance that some orders in your system end up having associated an email address that is no longer valid. We've added a task to check precisely that:
```bash bin/rails solidus:check_orders_with_invalid_email ```
The above will print information for every affected order if any.
### Workarounds
If a prompt upgrade is not an option, please, add the following to `config/application.…