activesupport 8.0.5.2

on Ruby Gems

Active Support

• ActiveSupport::Inflector#safe_constantize matches the constant name in a
  LoadError message as a literal string instead of building a Regexp
  from it.

  The name's segments were interpolated unescaped into the pattern, so input
  that reaches safe_constantize, such as the channel identifier in an Action
  Cable subscribe command, chose the source passed to the regexp compiler.

  [GHSA-8474-xrp6-wh69]

  Jeremy Daer

Active Model

• No changes.

Active Record

• No changes.

Action View

• Skip attribute names in tag helpers that are blank once converted to a
  string.

  A Symbol such as :" " is not blank, because Symbol#blank? is
  Symbol#empty?, so it reached the escaping step and produced an attribute
  with no name. The asset helpers symbolize their keys, so an ordinary String
  key reached the same place.

  [GHSA-68p9-83h6-5wpj]

  Mike Dalessio

• Fix strip_tags to encode " and ' in its output.

  strip_tags returns an html_safe string, but was not encoding quotation
  marks. The method now encodes all five HTML-significant characters (&,
  <, >, ", '), consistent with the existing html_safe convention.

  Output used outside HTML, such as in a text template or JSON, now contains
  " and ' where it contained " and '. CGI.unescapeHTML
  decodes them.

  [GHSA-rq8q-p985-fjq7]

  Mike Dalessio

• Escape the matched phrase before substituting it into highlight's
  :highlighter.

  A match was copied into each \1 of the highlighter as it appeared in
  the sanitized text, which keeps " and ' as they are, so a match
  containing a quote ended a quoted attribute value such as the
  documented '<a href="search?q=\1">\1</a>' and added attributes of
  its own. Each substituted group now goes through
  ERB::Util.html_escape_once, so quotes in a match render as "
  and '. Only the numbered placeholders \0 to \9 are expanded,
  and a match never replaces the > that closes a tag.

  [GHSA-v6rj-xm57-3p59]

  Jeremy Daer

• Require rails-html-sanitizer 1.7.2 or later.

  With the HTML5 sanitizer, Nokogiri before 1.19.5 left < and >
  unescaped in attribute values. highlight and simple_format, which
  edit the sanitized HTML as a string, could then turn markup inside an
  attribute value into live elements. rails-html-sanitizer 1.7.2 requires
  Loofah 2.25.3, which requires Nokogiri 1.19.5.

  [GHSA-2p2f-4rq4-gjwc]

  Mike Dalessio

Action Pack

• Apply config.action_dispatch.cookies_same_site_protection to every session
  store.

  ActionDispatch::Session::CacheStore, MemCacheStore and third-party
  stores built on AbstractStore or the session mixins sent session cookies
  with no SameSite attribute. Only CookieStore applied the configured
  default.

  [GHSA-gmj8-hvj3-49mw]

  Jean Boussier

• Prevent ActionController::Live streams from blocking when a full buffer is
  closed or aborted.

  [GHSA-rwvh-fw6r-pwvp]

  Jeremy Daer

• Set and extend the Vary header for rendered responses according to the
  request headers used in format negotiation.

  Vary: Accept was only added when the request carried a usable Accept
  header. A response to a request without one, negotiated to HTML or
  JavaScript, could be stored by a shared cache and served to later clients
  that requested a different representation.

  Responses now vary on Accept and X-Requested-With whenever the format is
  not given by the URL. XHR requests without Accept also vary on
  Content-Type, which Rails uses as a legacy format fallback. When
  config.action_dispatch.ignore_accept_header is enabled, responses vary
  only on X-Requested-With.

  These fields are appended to an existing Vary value without duplicating
  fields case-insensitively. Vary: * remains unchanged.

  [GHSA-r9jg-fmfx-2gv6]

  Jeremy Daer

• Skip writing a CacheStore session that another request deleted while this
  one ran.

  A request that loaded a session from ActionDispatch::Session::CacheStore
  wrote it back when it finished, even after a concurrent reset_session or a
  server-side delete had removed it, so the old session ID worked again.

  [GHSA-2586-8ghr-69fj]

  Mike Dalessio

• Don't write upgraded cookies to a response that skips the session.

  Reading a signed or encrypted cookie written under a rotated secret, or in
  the format a :hybrid serializer migrates from, writes it back in the
  current format. That write ignored request.session_options[:skip], so a
  response that skips the session, such as the Active Storage proxy's
  public, cacheable response, could still carry the session cookie in
  Set-Cookie. Such a response now leaves the cookie unchanged, and a later
  request that does not skip the session upgrades it. An application that
  skips the session on every request no longer upgrades its signed or
  encrypted cookies. Cookies the application sets are still written.

  [GHSA-x6mj-8jx9-qhqv]

  Mike Dalessio

• ActionController::Parameters#each_key returns self when given a block.

  It returned the internal ActiveSupport::HashWithIndifferentAccess, which
  does not respond to permitted?, so passing that return value to mass
  assignment skipped the Strong Parameters check. each, each_pair and
  each_value already return self.

  Document that ActionController::Parameters#as_json returns every
  parameter, permitted or not, in a hash that mass assignment does not check.

  [GHSA-wm3x-v3qw-4jh3]

  Mike Dalessio

Active Job

• No changes.

Action Mailer

• No changes.

Action Cable

• No changes.

Active Storage

• Preserve committed proxy responses when a storage error interrupts a
  streamed download.

  [GHSA-4v2w-w6g6-f8f8]

  Jeremy Daer

• Derive ActiveStorage::Filename#base and #extension from the sanitized
  filename.

  This prevents null bytes and invalid byte sequences in stored filename
  metadata from raising when a blob is opened or represented. Existing blob
  records are handled without a data migration.

  [GHSA-p2pm-g2h6-7j5j]

  Jeremy Daer

• Ship an ImageMagick security policy and apply it to every ImageMagick
  process MiniMagick spawns.

  ImageMagick chooses a coder from the content of the file it is given, and
  some coders act on files named inside the image rather than on the image
  itself. Active Storage constrained none of them, so an uploaded file could
  reach any coder the host's policy allowed, through the ImageMagick analyzer
  at attach time, with no variant or analyze call in the application.

  Active Storage now ships a policy.xml in
  ActiveStorage::ImageMagick::POLICY_DIRECTORY and prepends that directory
  to MAGICK_CONFIGURE_PATH through MiniMagick.cli_env. ImageMagick applies
  every policy file on its search path, so the shipped policy adds to the
  host's policy rather than replacing it. A MAGICK_CONFIGURE_PATH set in the
  environment or in MiniMagick.cli_env, including by an initializer or
  dotenv, is kept after the shipped directory.

  The shipped policy denies the coders that script ImageMagick (MSL), read
  or delete files other than the image (TEXT, EPHEMERAL), fetch remote
  references (URL, HTTP, HTTPS, FTP), display to a screen (SHOW,
  WIN, PLT), or hand the file to Ghostscript (the PS, EPS, EPT and
  PDF coders, every alias of them, and the gs delegate), or reach a file
  directly (FILE, MPC, XPS, PCL), and it refuses @filename
  indirection. The policy applies to every ImageMagick command MiniMagick
  runs, not only Active Storage's.

  These applications must act:

  • One whose variant processor is :mini_magick has to use mini_magick 5.1
    or later, which applying the policy requires. With an older mini_magick,
    it raises at boot.
  • One that renders PostScript or PDF through ImageMagick has to re-allow
    the gs delegate and the coders it uses in the host's policy.xml. A
    host policy that allows a coder overrides the shipped deny.
  • One that replaces MiniMagick.cli_env after it boots, clears the
    environment with MiniMagick.cli_prefix, or installs its own
    MiniMagick::Shell never receives the shipped policy and has to carry
    its rules in ImageMagick's system policy. So does one that uses
    GraphicsMagick, which does not read ImageMagick policies.

  Every other application needs no change. See "ImageMagick Security Policy"
  in the Active Storage guide.

  [GHSA-f3w6-w445-fwh9]

  Mike Dalessio

• Enforce the declared content length on Google Cloud Storage direct uploads.

  The signed URL now requires an x-goog-content-length-range header matching the blob's
  byte_size, so Cloud Storage rejects a body of any other size.

  Browsers send the new header, so a bucket's CORS configuration must list
  x-goog-content-length-range in responseHeader, or direct uploads from the browser fail.

  [GHSA-hfr4-8rjc-97m2]

  Mike Dalessio

• Sign GCS direct uploads with V2 when cache_control is set.

  V4 signatures did not bind the Content-Type or Content-MD5 headers, so the uploader could
  choose the stored Content-Type. Direct-upload URLs with cache_control are no longer limited
  to 7 days, and the client sends Cache-Control unsigned.

  [GHSA-3w93-6hmw-whh4]

  Mike Dalessio

• Stop an uploaded filename choosing the extension of the tempfile Active
  Storage hands to an external tool.

  ActiveStorage::Blob#open named its tempfile after the uploaded filename,
  extension and all. Tools that select a decoder from the extension alone,
  such as FFmpeg's AviSynth demuxer on .avs, therefore took their
  instructions from the uploader. The extension is now kept only when it
  denotes the blob's recorded media type, and dropped otherwise.

  [GHSA-v924-7rp8-4mxh]

  Mike Dalessio

• Restrict the formats ffmpeg and ffprobe will open when previewing and
  analyzing video and audio.

  Active Storage now passes -format_whitelist before the input at every
  ffmpeg and ffprobe call site, limiting demuxer selection to common audio and
  video container formats. Configure the list with
  config.active_storage.ffmpeg_allowed_formats, or set it to nil to let
  ffmpeg choose any demuxer it was built with.

  Files in other formats, such as MXF, DV, AC3, WavPack, AU, W64, and raw
  H.264 or MPEG-1/2 video streams, now fail to preview with
  ActiveStorage::PreviewError, and their analysis stores no media metadata
  and logs a warning. Add their demuxers to the list to keep them.

  config.active_storage.ffmpeg_allowed_formats += %w[ mxf ]

  [GHSA-3f4q-8x5m-76v8]

  Mike Dalessio

Action Mailbox

• Reject Mailgun inbound emails whose timestamp is more than 2 minutes ahead
  of local time.

  [GHSA-5957-c7qm-m469]

  Mike Dalessio

Action Text

• No changes.

Railties

• No changes.

Guides

• No changes.