🚨 [security] Update rack: 2.0.5 → 2.0.9.2 (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, 2.0.5 → 2.0.9.2) · Repo · Changelog

Security Advisories 🚨

🚨 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.

🚨 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 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.

🚨 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.

🚨 Possible information leak / session hijack vulnerability

There's a possible information leak / session hijack vulnerability in Rack.

Attackers may be able to find and hijack sessions by using timing attacks
targeting the session id. Session ids are usually stored and indexed in a
database that uses some kind of scheme for speeding up lookups of that
session id. By carefully measuring the amount of time it takes to look up
a session, an attacker may be able to find a valid session id and hijack
the session.

The session id itself may be generated randomly, but the way the session is
indexed by the backing store does not use a secure comparison.

Impact:

The session id stored in a cookie is the same id that is used when querying
the backing session storage engine. Most storage mechanisms (for example a
database) use some sort of indexing in order to speed up the lookup of that
id. By carefully timing requests and session lookup failures, an attacker
may be able to perform a timing attack to determine an existing session id
and hijack that session.

🚨 Possible XSS vulnerability in Rack

There is a possible vulnerability in Rack. This vulnerability has been
assigned the CVE identifier CVE-2018-16471.

Versions Affected: All.
Not affected: None.
Fixed Versions: 2.0.6, 1.6.11

Impact

There is a possible XSS vulnerability in Rack. Carefully crafted requests can
impact the data returned by the scheme method on Rack::Request.
Applications that expect the scheme to be limited to "http" or "https" and do
not escape the return value could be vulnerable to an XSS attack.

Vulnerable code looks something like this:
<%= request.scheme.html_safe %>
Note that applications using the normal escaping mechanisms provided by Rails
may not impacted, but applications that bypass the escaping mechanisms, or do
not use them may be vulnerable.

All users running an affected release should either upgrade or use one of the
workarounds immediately.

Releases

The 2.0.6 and 1.6.11 releases are available at the normal locations.

Workarounds

The following monkey patch can be applied to work around this issue:
require "rack"
require "rack/request"

class Rack::Request
SCHEME_WHITELIST = %w(https http).freeze

def scheme
  if get_header(Rack::HTTPS) == 'on'
    'https'
  elsif get_header(HTTP_X_FORWARDED_SSL) == 'on'
    'https'
  elsif forwarded_scheme
    forwarded_scheme
  else
    get_header(Rack::RACK_URL_SCHEME)
  end
end

def forwarded_scheme
  scheme_headers = [
    get_header(HTTP_X_FORWARDED_SCHEME),
    get_header(HTTP_X_FORWARDED_PROTO).to_s.split(',')[0]
  ]

  scheme_headers.each do |header|
    return header if SCHEME_WHITELIST.include?(header)
  end

  nil
end
end

🚨 Possible DoS vulnerability in Rack

There is a possible DoS vulnerability in the multipart parser in Rack. This
vulnerability has been assigned the CVE identifier CVE-2018-16470.

Versions Affected: 2.0.4, 2.0.5
Not affected: <= 2.0.3
Fixed Versions: 2.0.6

Impact

There is a possible DoS vulnerability in the multipart parser in Rack.
Carefully crafted requests can cause the multipart parser to enter a
pathological state, causing the parser to use CPU resources disproportionate to
the request size.

Impacted code can look something like this:
Rack::Request.new(env).params
But any code that uses the multi-part parser may be vulnerable.

Rack users that have manually adjusted the buffer size in the multipart parser
may be vulnerable as well.

All users running an affected release should either upgrade or use one of the
workarounds immediately.

Releases

The 2.0.6 release is available at the normal locations.

Workarounds

To work around this issue, the following code can be used:
require "rack/multipart/parser"

Rack::Multipart::Parser.send :remove_const, :BUFSIZE
Rack::Multipart::Parser.const_set :BUFSIZE, 16384

Release Notes

2.0.8 (from changelog)

[CVE-2019-16782] Prevent timing attacks targeted at session ID lookup. (@tenderlove, @rafaelfranca)

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

Commits

See the full diff on Github. The new version differs by 37 commits:

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