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[Launchpad Bug Tracker <918489@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package deja-dup - 37.1-2fakesync1ubuntu0.2

---------------
deja-dup (37.1-2fakesync1ubuntu0.2) bionic; urgency=medium

  * debian/patches/invalid_password_handling.patch:
    - handle correctly when an invalid password is entered
      (lp: #918489)

 -- Sebastien Bacher <seb128@xxxxxxxxxx>  Thu, 25 Nov 2021 17:53:50
+0100

** Changed in: deja-dup (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/918489

Title:
  duplicity allows a new, different passphrase if an archive cache
  exists

Status in Déjà Dup:
  Fix Released
Status in Duplicity:
  Fix Released
Status in deja-dup package in Ubuntu:
  Fix Released
Status in duplicity package in Ubuntu:
  Fix Released
Status in deja-dup source package in Trusty:
  Fix Released
Status in duplicity source package in Trusty:
  Won't Fix
Status in deja-dup source package in Xenial:
  Fix Released
Status in duplicity source package in Xenial:
  Won't Fix
Status in deja-dup source package in Yakkety:
  Fix Released
Status in duplicity source package in Yakkety:
  Won't Fix
Status in deja-dup source package in Bionic:
  Fix Released
Status in duplicity source package in Bionic:
  Won't Fix

Bug description:
  when doing a backup for the first time, dejadup verifies your
  passphrase by having you enter it twice.

  on future incremental backups it doesn't need to do this because
  entering the wrong password will result in the backup failing.

  with the periodic 'full' backups that happen from time to time,
  however, any password will be accepted.

  this can lead to a situation where you accidentally type the wrong
  password once and are left in a situation where you don't know what
  you typed and have no way to get your files (or do another incremental
  backup on top of it).

  i think this is what happened to me recently.

  clearly, the fix is to explicitly verify the passphrase is correct
  when doing a new full backup.  this may be a duplicity bug.

  === Ubuntu deja-dup SRU information ===

  [impact]
  Users may unwittingly re-set their backup password and not be able to restore their data.

  [test case]
  - $ deja-dup-preferences # set up a dummy backup
  - $ deja-dup --backup # complete first encrypted full backup
  - $ rename 's/\.2016/\.2000/' /path/to/test/backup/*
  - $ rename 's/\.2016/\.2000/' ~/.cache/deja-dup/*/*
  - $ deja-dup --backup # second backup, enter the wrong password
  - $ deja-dup --restore # try to restore with original password

  [regression potential]
  Should be limited?  The fix is to delete the duplicity cache files, which ought to be safe to delete.

  It's possible if a full backup is being resumed, we might delete the
  current progress.  That is a better bug to have than this bug, though.
  A more complicated patch would need to be investigated to prevent
  that.

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