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GHSA-qxmr-qxh6-2cc9
No affected components available
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:
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There's an improbable chance that some orders in your system end up having associated an email address that is no longer valid.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:
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.rb:
config.after_initialize do
Spree::EmailValidator.send(:remove_const, :EMAIL_REGEXP)
Spree::EmailValidator::EMAIL_REGEXP = URI::MailTo::EMAIL_REGEXP
end
References
- https://en.wikipedia.org/wiki/ReDoS
- https://snyk.io/blog/redos-and-catastrophic-backtracking/
For more information
If you have any questions or comments about this advisory:
- Open an issue or a discussion in Solidus.
- Email us at security@solidus.io
- Contact the core team on Slack
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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