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AUSCERT External Security Bulletin Redistribution
ESB-2021.1673
USN-4958-1: Caribou vulnerability
18 May 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Caribou
Publisher: Ubuntu
Operating System: Ubuntu
Linux variants
Impact/Access: Denial of Service -- Console/Physical
Unauthorised Access -- Console/Physical
Resolution: Patch/Upgrade
Original Bulletin:
https://ubuntu.com/security/notices/USN-4958-1
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running check for an updated version of the software for their
operating system.
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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.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
Packages
o 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
o gir1.2-caribou-1.0 - 0.4.21-7ubuntu0.20.10.1
o libcaribou0 - 0.4.21-7ubuntu0.20.10.1
Ubuntu 20.04
o gir1.2-caribou-1.0 - 0.4.21-7ubuntu0.20.04.1
o 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
o https://launchpad.net/bugs/1912060
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