Workspace view is showing before unlocking 19.04

Bug #1842668 reported by Jalil Farid
258
This bug affects 1 person
Affects Status Importance Assigned to Milestone
gnome-shell (Ubuntu)
Confirmed
Undecided
Unassigned

Bug Description

This is sort of a strange issue and I'm open to any discussion on how to further investigate. I lock my screen using the Gnome lock, then go away for a few hours. When I return to wake up my computer, an instance of my desktop from some time ago actually shows for a second or two. After this, the lock screen lowers, prompting for a password.

This is weird. I swear this was an issue a few years ago and I remember a blog post about it that was really popular, but it seemed like it was taken super seriously and got fixed within a few months. I feel like this is a major security issue because something is caching my screen instance and is actually able to show it to a user before unlock. The only thing is I can't seem to find the posting, or any note that it was an issue at all. I specifically remember the post mentioned something about porn as the captured desktop image.

Again, I can't seem to replicate, and I don't know what program runs the lock. I'd love to do a log dump if someone can point me to something to capture. I'm just not sure how to describe the issue, and I can't really capture the issue with screenshots.

System Details
Acer Aspire TC-885-ACCFLi3O
19.04 64 bit
Processor: Intel® Core™ i3-8100 CPU @ 3.60GHz × 4
GNOME 3.32.1

Tags: lock workspace
affects: ubuntu → gnome-shell (Ubuntu)
information type: Private Security → Public Security
Changed in gnome-shell (Ubuntu):
status: New → Confirmed
Revision history for this message
Daniel van Vugt (vanvugt) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1532508, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

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