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USN-5286-1: cryptsetup vulnerability

15 February 2022

cryptsetup could be made to expose sensitive information.




Milan Broz discovered that cryptsetup incorrectly handled LUKS2
reencryption recovery. An attacker with physical access to modify the
encrypted device header may trigger the device to be unencrypted the next
time it is mounted by the user.

On Ubuntu 20.04 LTS, this issue was fixed by disabling the online
reencryption feature.

Update instructions

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

Ubuntu 21.10
Ubuntu 20.04

In general, a standard system update will make all the necessary changes.