🚨 [security] Update rack: 2.1.1 → 2.1.4.2 (minor)

🚨 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 → 2.1.4.2) · Repo · Changelog

Security Advisories 🚨

🚨 Denial of Service Vulnerability in Rack Content-Disposition parsing

There is a denial of service vulnerability in the Content-Disposition parsing
component of Rack. This vulnerability has been assigned the CVE identifier
CVE-2022-44571.

Versions Affected: >= 2.0.0
Not affected: None.
Fixed Versions: 2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.4.1

Impact

Carefully crafted input can cause Content-Disposition header parsing in Rack
to take an unexpected amount of time, possibly resulting in a denial of
service attack vector. This header is used typically used in multipart
parsing. Any applications that parse multipart posts using Rack (virtually
all Rails applications) are impacted.

Workarounds

There are no feasible workarounds for this issue.

🚨 Denial of service via header parsing in Rack

There is a possible denial of service vulnerability in the Range header
parsing component of Rack. This vulnerability has been assigned the CVE
identifier CVE-2022-44570.

Versions Affected: >= 1.5.0
Not affected: None.
Fixed Versions: 2.0.9.2, 2.1.4.2, 2.2.6.2, 3.0.4.1

Impact

Carefully crafted input can cause the Range header parsing component in Rack
to take an unexpected amount of time, possibly resulting in a denial of
service attack vector. Any applications that deal with Range requests (such
as streaming applications, or applications that serve files) may be impacted.

Workarounds

There are no feasible workarounds for this issue.

🚨 Denial of service via multipart parsing in Rack

There is a denial of service vulnerability in the multipart parsing component
of Rack. This vulnerability has been assigned the CVE identifier
CVE-2022-44572.

Versions Affected: >= 2.0.0
Not affected: None.
Fixed Versions: 2.0.9.2, 2.1.4.2, 2.2.6.1, 3.0.4.1

Impact

Carefully crafted input can cause RFC2183 multipart boundary parsing in Rack
to take an unexpected amount of time, possibly resulting in a denial of
service attack vector. Any applications that parse multipart posts using
Rack (virtually all Rails applications) are impacted.

Workarounds

There are no feasible workarounds for this issue.

🚨 Possible shell escape sequence injection vulnerability in Rack

There is a possible shell escape sequence injection vulnerability in the Lint
and CommonLogger components of Rack. This vulnerability has been assigned the
CVE identifier CVE-2022-30123.

Versions Affected: All.
Not affected: None
Fixed Versions: 2.0.9.1, 2.1.4.1, 2.2.3.1

Impact

Carefully crafted requests can cause shell escape sequences to be written to
the terminal via Rack's Lint middleware and CommonLogger middleware. These
escape sequences can be leveraged to possibly execute commands in the victim's
terminal.

Impacted applications will have either of these middleware installed, and
vulnerable apps may have something like this:
use Rack::Lint
Or
use Rack::CommonLogger
All users running an affected release should either upgrade or use one of the
workarounds immediately.

Workarounds

Remove these middleware from your application

🚨 Denial of Service Vulnerability in Rack Multipart Parsing

There is a possible denial of service vulnerability in the multipart parsing
component of Rack. This vulnerability has been assigned the CVE identifier
CVE-2022-30122.

Versions Affected: >= 1.2
Not affected: < 1.2
Fixed Versions: 2.0.9.1, 2.1.4.1, 2.2.3.1

Impact

Carefully crafted multipart POST requests can cause Rack's multipart parser to
take much longer than expected, leading to a possible denial of service
vulnerability.

Impacted code will use Rack's multipart parser to parse multipart posts. This
includes directly using the multipart parser like this:
params = Rack::Multipart.parse_multipart(env)
But it also includes reading POST data from a Rack request object like this:
p request.POST # read POST data
p request.params # reads both query params and POST data
All users running an affected release should either upgrade or use one of the
workarounds immediately.

Workarounds

There are no feasible workarounds for this issue.

🚨 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 26 commits:

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