CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
43.2%
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 "[email protected].@"
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.
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There’s an improbable chance that some orders in your system end up having associated an email address that is no longer valid.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.
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
If you have any questions or comments about this advisory:
Vendor | Product | Version | CPE |
---|---|---|---|
* | solidus_core | * | cpe:2.3:a:*:solidus_core:*:*:*:*:*:*:*:* |
github.com/advisories/GHSA-qxmr-qxh6-2cc9
github.com/rubysec/ruby-advisory-db/blob/master/gems/solidus_core/CVE-2021-43805.yml
github.com/solidusio/solidus/commit/6be174c955fad84017ca67589c676526bc5ade71
github.com/solidusio/solidus/commit/9867153e01e3c3b898cdbcedd7b43375ea922401
github.com/solidusio/solidus/security/advisories/GHSA-qxmr-qxh6-2cc9
nvd.nist.gov/vuln/detail/CVE-2021-43805
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
43.2%