[Security] Bump rack from 2.0.6 to 2.1.1

[dependabot-preview]

Bumps rack from 2.0.6 to 2.1.1. This update includes security fixes.

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

Sourced from The Ruby Advisory Database.

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.

Patched versions: ~> 1.6.12; >= 2.0.8 Unaffected versions: none

Changelog

Sourced from rack's changelog.

[2.1.1] - 2020-01-12

• Remove Rack::Chunked from Rack::Server default middleware. (#1475, @ioquatix)
• Restore support for code relying on SessionId#to_s. (@jeremyevans)

[2.1.0] - 2020-01-10

Added

• Add support for SameSite=None cookie value. (@hennikul)
• Add trailer headers. (@eileencodes)
• Add MIME Types for video streaming. (@styd)
• Add MIME Type for WASM. (@buildrtech)
• Add Early Hints(103) to status codes. (@egtra)
• Add Too Early(425) to status codes. (@y-yagi)
• Add Bandwidth Limit Exceeded(509) to status codes. (@CJKinni)
• Add method for custom ip_filter. (@svcastaneda)
• Add boot-time profiling capabilities to rackup. (@tenderlove)
• Add multi mapping support for X-Accel-Mappings header. (@yoshuki)
• Add sync: false option to Rack::Deflater. (Eric Wong)
• Add Builder#freeze_app to freeze application and all middleware instances. (@jeremyevans)
• Add API to extract cookies from Rack::MockResponse. (@petercline)

Changed

• Don't propagate nil values from middleware. (@ioquatix)
• Lazily initialize the response body and only buffer it if required. (@ioquatix)
• Fix deflater zlib buffer errors on empty body part. (@felixbuenemann)
• Set X-Accel-Redirect to percent-encoded path. (@diskkid)
• Remove unnecessary buffer growing when parsing multipart. (@tainoe)
• Expand the root path in Rack::Static upon initialization. (@rosenfeld)
• Make ShowExceptions work with binary data. (@axyjo)
• Use buffer string when parsing multipart requests. (@janko-m)
• Support optional UTF-8 Byte Order Mark (BOM) in config.ru. (@mikegee)
• Handle X-Forwarded-For with optional port. (@dpritchett)
• 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. (@adambutler)
• Rename Request::SCHEME_WHITELIST to Request::ALLOWED_SCHEMES.
• Make Multipart::Parser.get_filename accept files with + in their name. (@lucaskanashiro)
• 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).
• Prefer Base64 “strict encoding” for Base64 cookies. (@ioquatix)

Removed

• Remove to_ary from Response (@tenderlove)
• Deprecate Rack::Session::Memcache in favor of Rack::Session::Dalli from dalli gem (@fatkodima)

... (truncated)

Commits

• 799a520 Updating changelog for 2-1-stable
• 4fabf4d Bump version.
• 10512e6 Remove chunked middleware from default server stack.
• db92251 Fix ActiveStorage use-case and add test case. Fixes #1464.
• 327a865 Do not deprecate Rack::File
• 04f541b Merge pull request #1462 from jeremyevans/sessionid-to_s
• 879ae71 Merge pull request #1461 from p8/cleanup-changelog
• acf7d44 Remove changes from CHANGELOG already present in older versions [ci skip]
• 7d14bac Merge pull request #1162 from snood1205/master
• 2b61454 Merge pull request #1459 from jimeh/add-breaking-change-warning-to-changelog
• Additional commits viewable in compare view

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Superseded by #653.