build(deps): [security] bump rack from 2.0.6 to 2.0.8

[dependabot-preview]

Bumps rack from 2.0.6 to 2.0.8. This update includes a security fix.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

Low severity vulnerability that affects rack 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.

Releases

The 1.6.12 and 2.0.8 releases are available at the normal locations.

Workarounds

There are no known workarounds.

Patches

To aid users who aren't able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a

... (truncated)

Affected versions: >= 2.0.0, < 2.0.8

Changelog

Sourced from rack's changelog.

Changelog

All notable changes to this project will be documented in this file. For info on how to format all future additions to this file please reference Keep A Changelog.

Unreleased

Note: There are many unreleased changes in Rack (master is around 300 commits ahead of 2-0-stable), and below is not an exhaustive list. If you would like to help out and document some of the unreleased changes, PRs are welcome.

Added

Changed

• Use Time#httpdate format for Expires, as proposed by RFC 7231. (@​nanaya)
• Make Utils.status_code raise an error when the status symbol is invalid instead of 500.
• Rename Request::SCHEME_WHITELIST to Request::ALLOWED_SCHEMES.
• Make Multipart::Parser.get_filename accept files with + in their name.
• Add Falcon to the default handler fallbacks. (@​ioquatix)
• Update codebase to avoid string mutations in preparation for frozen_string_literals. (@​pat)
• Change MockRequest#env_for to rely on the input optionally responding to #size instead of #length. (@​janko)
• Rename Rack::File -> Rack::Files and add deprecation notice. (@​postmodern).

Removed

Documentation

• Update broken example in Session::Abstract::ID documentation. (tonytonyjan)
• Add Padrino to the list of frameworks implmenting Rack. (@​wikimatze)
• Remove Mongrel from the suggested server options in the help output. (@​tricknotes)
• Replace HISTORY.md and NEWS.md with CHANGELOG.md. (@​twitnithegirl)
• Backfill CHANGELOG.md from 2.0.1 to 2.0.7 releases. (@​drenmi)

[2.0.7] - 2019-04-02

Fixed

• Remove calls to #eof? on Rack input in Multipart::Parser, as this breaks the specification. (@​matthewd)
• Preserve forwarded IP addresses for trusted proxy chains. (@​SamSaffron)

Commits

• e7ee459 Bumping version
• f1a79b2 Introduce a new base class to avoid breaking when upgrading
• 5b1cab6 Add a version prefix to the private id to make easier to migrate old values
• 1e96e0f Fallback to the public id when reading the session in the pool adapter
• 3ba123d Also drop the session with the public id when destroying sessions
• 6a04bbf Fallback to the legacy id when the new id is not found
• dc45a06 Add the private id
• 73a5f79 revert conditionals to master
• 4e32262 remove NullSession
• 1c7e3b2 remove || raise and get closer to master
• Additional commits viewable in compare view

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[coveralls]

Pull Request Test Coverage Report for Build 635

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.667%

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Totals
Change from base Build 412:	0.0%
Covered Lines:	13
Relevant Lines:	15

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💛 - Coveralls

[dependabot-preview]

Superseded by #187.