[Bug 1744318] Update Released

[Brian Murray]

The verification of the Stable Release Update for update-manager has
completed successfully and the package is now being released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1744318

Title:
  changelogs.ubuntu.com should be using HTTPS

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in update-manager package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Xenial:
  Fix Released
Status in update-manager source package in Xenial:
  Fix Committed
Status in ubuntu-release-upgrader source package in Bionic:
  Fix Released
Status in update-manager source package in Bionic:
  Fix Released

Bug description:
  [Impact]
  Although the packages listed in meta-release files on changelogs.ubuntu.com are signature-checked there doesn't appear to be any way to verify the meta-release files are valid so a man-in-the-middle could maliciously supply an alternate meta-release.

  meta-release files should be signed with the archive GPG key and/or
  delivered over HTTPS.

  [Test case]
  Block port 80 access to changelogs.ubuntu.com and check that do-release-upgrade still works

  [Regression potential]
  This breaks any clients behind a proxy where HTTPS (CONNECT on the proxy) is not allowed.

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