[Bug 1777415] Re: Local authorization bypass by using suspend mode

[ras]

Markus Laire,
Yes, the bug is exploitable even with full disk encryption. Among other things, if there's an open instant messaging app, an attacker can send a message which would appear as if it was sent by the authenticated user.

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Title:
  Local authorization bypass by using suspend mode

Status in Unity:
  New
Status in pam package in Ubuntu:
  New
Status in unity package in Ubuntu:
  Confirmed

Bug description:
  Version: Ubuntu 16.04.04 LTS Desktop, all packets are updated at 15.06.2018
  Affects: access to latest user opened applications, that can contain sensitive information (documents, private information, passwords, etc.)
  How to reproduce:
  1. open some applications (LibreOffice, browsers, editors, ...)
  2. go to suspend mode
  3. extract hard drive
  4. wake up
  5. after that can be several behaviors:
   * Ubuntu show lock screen. Enter ANY password -> access granted.
   * Ubuntu show lock screen. Enter ANY password, access denied. Fast press the hardware shutdown button -> access granted.
   * Ubuntu does not show lock screen, only black screen. We can repeat actions like in previous paragraphs

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