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USN-4958-1: Caribou vulnerability

17 May 2021

Applications using Caribou could be made to crash if given specially crafted input.



  • caribou - Configurable on screen keyboard with scanning mode


It was discovered that the Caribou onscreen keyboard could be made
to crash when given certain input values. An attacker could use this
to bypass screen-locking applications that support using Caribou as
an input mechanism.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.10
Ubuntu 20.04

After a standard system update you need to restart applications that
use Caribou as an onscreen keyboard to make all the necessary changes.