[Bug 1916050] Update Released

[Brian Murray]

The verification of the Stable Release Update for apt 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/1916050

Title:
  Invalid base64 for high-bit characters

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Xenial:
  Confirmed
Status in apt source package in Bionic:
  Fix Committed
Status in apt source package in Focal:
  Fix Committed
Status in apt source package in Groovy:
  Fix Released
Status in apt source package in Hirsute:
  Fix Released

Bug description:
  [Impact]
  The Base64Encode function incorrectly encodes using char instead of uint8_t, leading to characters with the high bit set to be encoded wrongly. This function is used for base authentication, and high bits are set for UTF-8 character sequences, so it's likely affecting people with utf-8 user names and passwords and might cause them to be denied access to their https resources (though arguably they'd work around that).

  [Test case]
  A unit test has been added that checks that the encoding is correct.

  [Where problems could occur]
  This only affects the base64 encoding function, which is only used for quoting user names and passwords in basic auth in http, but it's also exposed to library users and like in python-apt, so problems could occur wherever they use that base64 encoding function as well.

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