mattzollinhofer / teachy

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🚨 [security] Update rack: 2.1.1 → 2.1.4 (patch) #107

Closed depfu[bot] closed 2 years ago

depfu[bot] commented 4 years ago

🚨 Your current dependencies have known security vulnerabilities 🚨

This dependency update fixes known security vulnerabilities. Please see the details below and assess their impact carefully. We recommend to merge and deploy this as soon as possible!


Here is everything you need to know about this update. Please take a good look at what changed and the test results before merging this pull request.

What changed?

↗️ rack (indirect, 2.1.1 → 2.1.4) · Repo · Changelog

Security Advisories 🚨

🚨 Percent-encoded cookies can be used to overwrite existing prefixed cookie names

It is possible to forge a secure or host-only cookie prefix in Rack using
an arbitrary cookie write by using URL encoding (percent-encoding) on the
name of the cookie. This could result in an application that is dependent on
this prefix to determine if a cookie is safe to process being manipulated
into processing an insecure or cross-origin request.
This vulnerability has been assigned the CVE identifier CVE-2020-8184.

Versions Affected: rack < 2.2.3, rack < 2.1.4
Not affected: Applications which do not rely on __Host- and __Secure- prefixes to determine if a cookie is safe to process
Fixed Versions: rack >= 2.2.3, rack >= 2.1.4

Impact

An attacker may be able to trick a vulnerable application into processing an
insecure (non-SSL) or cross-origin request if they can gain the ability to write
arbitrary cookies that are sent to the application.

Workarounds

If your application is impacted but you cannot upgrade to the released versions or apply
the provided patch, this issue can be temporarily addressed by adding the following workaround:

module Rack
  module Utils
    module_function def parse_cookies_header(header)
      return {} unless header
      header.split(/[;] */n).each_with_object({}) do |cookie, cookies|
        next if cookie.empty?
        key, value = cookie.split('=', 2)
        cookies[key] = (unescape(value) rescue value) unless cookies.key?(key)
      end
    end
  end
end

🚨 Directory traversal in Rack::Directory app bundled with Rack

There was a possible directory traversal vulnerability in the Rack::Directory app
that is bundled with Rack.

Versions Affected: rack < 2.2.0
Not affected: Applications that do not use Rack::Directory.
Fixed Versions: 2.1.3, >= 2.2.0

Impact

If certain directories exist in a director that is managed by
Rack::Directory, an attacker could, using this vulnerability, read the
contents of files on the server that were outside of the root specified in the
Rack::Directory initializer.

Workarounds

Until such time as the patch is applied or their Rack version is upgraded,
we recommend that developers do not use Rack::Directory in their
applications.

Release Notes

2.1.2 (from changelog)

  • Fix multipart parser for some files to prevent denial of service (@aiomaster)
  • Fix Rack::Builder#use with keyword arguments (@kamipo)
  • Skip deflating in Rack::Deflater if Content-Length is 0 (@jeremyevans)
  • Remove SessionHash#transform_keys, no longer needed (@pavel)
  • Add to_hash to wrap Hash and Session classes (@oleh-demyanyuk)
  • Handle case where session id key is requested but missing (@jeremyevans)

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by 14 commits:


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depfu[bot] commented 2 years ago

Closed in favor of #127.