Sourced from The Ruby Advisory Database.

Path Traversal in Sprockets Specially crafted requests can be used to access files that exist on the filesystem that is outside an application's root directory, when the Sprockets server is used in production.

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

Workaround: In Rails applications, work around this issue, set config.assets.compile = false and config.public_file_server.enabled = true in an initializer and precompile the assets.

This work around will not be possible in all hosting environments and upgrading is advised.

Patched versions: >= 2.12.5, < 3.0.0; >= 3.7.2, < 4.0.0; >= 4.0.0.beta8 Unaffected versions: none

Sourced from sprockets's changelog.

4.0.2

• Fix etag and digest path compilation that were generating string with invalid digest since 4.0.1.

4.0.1

• Fix for Ruby 2.7 keyword arguments warning in base.rb. #660
• Fix for when x_sprockets_linecount is missing from a source map.
• Fix subresource integrity to match the digest of the asset.

4.0.0

• Fixes for Ruby 2.7 keyword arguments warnings #625
• Manifest files are sorted alphabetically #626

4.0.0.beta10

• Fix YACB (Yet Another Caching Bug) Fix broken expansion of asset link paths

4.0.0.beta9

• Minimum Ruby version for Sprockets 4 is now 2.5+ which matches minimum ruby verision of Rails #604
• Fix threading bug introduced in Sprockets 4 #603
• Warn when two potential manifest files exist. #560

4.0.0.beta8

• Security release for CVE-2018-3760

4.0.0.beta7

• Fix a year long bug that caused Sprockets::FileNotFound errors when the asset was present #547
• Raise an error when two assets such as foo.js and foo.js.erb would produce the same output artifact (foo.js) [#549 #530]
• Process *.jst.eco.erb files with ERBProcessor

4.0.0.beta6

• Fix source map line offsets #515
• Return a 400 Bad Request when the path encoding is invalid. #514

4.0.0.beta5

• Reduce string allocations
• Source map metadata uses compressed form specified by the source map v3 spec. #402 [BREAKING]
• Generate index maps when decoding source maps isn't necessary. #402
• Remove fingerprints from source map files. #402

4.0.0.beta4

• Changing the version now busts the digest of all assets #404

... (truncated)

• 8fc492a Merge pull request #685 from matteeyah/master
• c995430 Use character for #delete_prefix instead of RegEx
• 53efbb8 Fix rubocop violation
• 9d1902b Only digest the environment version if it is not blank
• 97e2ac6 Prepare to 4.0.2
• b698a1a Digest the environment and digest before packing the hexdigest
• 841ddbe Test with Ruby 2.7
• ac399e5 Prepare to 4.0.1
• 7f64817 Make sure the digest path changes when the environment changes
• 0bcb8ae No need to call self here
• Additional commits viewable in compare view

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