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FS#69338 - [caribou] [cinnamon-screensaver] Screensaver lock bypass via the virtual keyboard

Attached to Project: Arch Linux
Opened by Eli Schwartz (eschwartz) - Friday, 15 January 2021, 19:22 GMT
Last edited by Jan Alexander Steffens (heftig) - Saturday, 16 January 2021, 22:56 GMT
Task Type Bug Report
Category Security
Status Closed
Assigned To Jan de Groot (JGC)
Jan Alexander Steffens (heftig)
Levente Polyak (anthraxx)
Architecture All
Severity Critical
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No


Pressing a certain key in caribou's on-screen keyboard can crash caribou on versions of xorg-server containing the fix for CVE-2020-25712.

Cinnamon uses caribou's on-screen keyboard in the lock screen, and crashing caribou crashes the lock screen, thus bypassing the password prompt and granting arbitrary physical access to unattended login sessions.

The cinnamon developers have submitted a MR to caribou which fixes the crash:

No CVE has been assigned yet, I think.
This task depends upon

Closed by  Jan Alexander Steffens (heftig)
Saturday, 16 January 2021, 22:56 GMT
Reason for closing:  Fixed
Additional comments about closing:  caribou 0.4.21+66+g14f5428-3