GHSA-fg3j-5w9g-hmg7 authd: Primary group ID is incorrectly set to value of UID

• Go github.com/canonical/authd: >= 0.6.0, < 0.6.4 → fixed in 0.6.4

authd 0.6.0 contains a bug which can lead to an incorrect primary group ID. It affects users whose primary group ID (i.e. the GID in the user record) differs from their UID. There are two ways which can lead to this: 1. The user was created with authd &2 continue fi if [ "$OLD_GID" = "$GID" ]; then continue # user not affected fi USER_HOME=$(getent passwd "$user" | cut -d: -f6) echo "Fixing $user: resetting GID from $OLD_GID to $GID" sudo authctl group set-gid "$user" "$OLD_GID" sudo authctl group set-gid "$user" "$GID" sudo chown -R --from=":$OLD_GID" ":$GID" "$USER_HOME" done ``` After applying the fix, affected users must log out and log back in for `id`, `groups`, and new file GID stamping to reflect the corrected primary group. You may also optionally terminate a user's active session with: ```bash sudo loginctl terminate-user "$user" ``` If the users also own files outside their home directory, the ownership of those files might have to be updated as well. Fixed by: https://github.com/canonical/authd/commit/154b428305cb1a7a19c897626fefd09d6dde8b9f