Screen contents visible briefly on lock screen on resolution change

[Dushyant]

I am using a remote application to AnyDesk to remote access my Ubuntu 16.04 LTS 64 bit. On the application we can resize the screen and have the resolution of the target computer scale up and down when this is done.

When the computer is locked on the login screen if the screen is resized ( resolution changes ) - For a brief fraction of a second the unlocked screen flashes and the login screen shows up again. I think this is a security breach to be able to peek into the inside contents even though the computer is locked.

Please feel free to close this issue if this is an already known issue or if its already fixed in later releases.

[Eduardo Barretto (ebarretto)]

@vanvugt, could you please take a look on this and assign it to the correct package.
It might be a duplicate of another ticket.
Thanks!

[Daniel van Vugt (vanvugt)]

I actually don't remember the relevant processes from pre-GNOME, sorry.

[Dushyant (dmingod)]

Hi,

This was very hard to replicate multiple times on my setup later. I also
have a nagging feeling, It could be possibly be an issue with AnyDesk
actually showing my host screen IDE for a fraction of a second which
matched my Ubuntu screen which brought up the confusion.

I myself can't accurately replicate this again, please feel free to close
the issue.

Thanks & Regards,

-Dushyant Min

On Wed, Mar 11, 2020 at 8:21 PM Marc Deslauriers <
<email address hidden>> wrote:

> ** Changed in: lightdm (Ubuntu)
> Status: New => Triaged
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1854120
>
> Title:
> Screen contents visible briefly on lock screen on resolution change
>
> Status in lightdm package in Ubuntu:
> Triaged
>
> Bug description:
> I am using a remote application to AnyDesk to remote access my Ubuntu
> 16.04 LTS 64 bit. On the application we can resize the screen and have
> the resolution of the target computer scale up and down when this is
> done.
>
> When the computer is locked on the login screen if the screen is
> resized ( resolution changes ) - For a brief fraction of a second the
> unlocked screen flashes and the login screen shows up again. I think
> this is a security breach to be able to peek into the inside contents
> even though the computer is locked.
>
> Please feel free to close this issue if this is an already known issue
> or if its already fixed in later releases.
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1854120/+subscriptions
>