** Package changed: linux (Ubuntu) => s390-tools (Ubuntu)
** Also affects: s390-tools-signed (Ubuntu)
Importance: Undecided
Status: New
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Changed in: s390-tools (Ubuntu)
Assignee: Skipper Bug Screeners (skipper-screen-team) => (unassigned)
** Changed in: ubuntu-z-systems
Importance: Undecided => Critical
** Information type changed from Public to Public Security
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https://bugs.launchpad.net/bugs/2059303
Title:
[UBUNTU 20.04] SE-tooling: New IBM host-key subject locality
(s390-tools)
Status in Ubuntu on IBM z Systems:
New
Status in s390-tools package in Ubuntu:
New
Status in s390-tools-signed package in Ubuntu:
New
Bug description:
Description: SE-tooling: New IBM host-key subject locality
Symptom:
On April 24 (z15) / March 29 (z16) user will notice that the
tooling for Secure execution will no longer detect that the provided
IBM signing key for that generation is a valid IBM signing key. The
error message will contain "no IBM signing key found" or similar. The
respective tool will reject creating an encrypted request/image as it
could not verify the host-key for its validity. This affects
genprotimg, pvattest, and pvsecret.
Problem:
The new IBM signing keys no longer contain 'Poughkeepsie' as 'subject
locality' and 'Armonk' is used. The SE tooling checks, beside other
things, for the subject in the IBM signing key. If the subject is not
the expected one, the certificate is not recognized as a valid IBM
signing key. With no valid IBM signing key, the host-key verification
cannot succeed and users cannot build trustable SE images and
attestation or add-secret requests.
Solution:
Mitigations are available upstream. The fixes allow Armonk as
additional locality in the subject and allow potential mismatches in
the locality of revocation list or host-key issuer subject that may
still contain Poughkeepsie instead of Armonk.
Reproduction: Use a new IBM signing key in the unpatched tooling.
The fix is required due to the circumstances described here:
https://www.ibm.com/docs/en/linux-on-systems?topic=systems-whats-new#iplsdkwhatsnew__title__2
This is required for all Ubuntu releases in service that support secure
execution.
Therefore, Ubuntu 20.04 LTS (focal) and above are affected and need to be
fixed.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-z-systems/+bug/2059303/+subscriptions
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