Ubuntu Security Notice 4958-1 - 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.
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Ubuntu Security Notice USN-4958-1
May 17, 2021
caribou vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.10
- Ubuntu 20.04 LTS
Summary:
Applications using Caribou could be made to crash if given specially
crafted input.
Software Description:
- caribou: Configurable on screen keyboard with scanning mode
Details:
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:
gir1.2-caribou-1.0 0.4.21-7ubuntu0.20.10.1
libcaribou0 0.4.21-7ubuntu0.20.10.1
Ubuntu 20.04 LTS:
gir1.2-caribou-1.0 0.4.21-7ubuntu0.20.04.1
libcaribou0 0.4.21-7ubuntu0.20.04.1
After a standard system update you need to restart applications that
use Caribou as an onscreen keyboard to make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-4958-1
https://launchpad.net/bugs/1912060
Package Information:
https://launchpad.net/ubuntu/+source/caribou/0.4.21-7ubuntu0.20.10.1
https://launchpad.net/ubuntu/+source/caribou/0.4.21-7ubuntu0.20.04.1