[USN-6279-1] OpenSSH update
nishit.majithia at canonical.com
Wed Aug 9 08:19:21 UTC 2023
Ubuntu Security Notice USN-6279-1
August 09, 2023
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)
A hardening measure was added to OpenSSH.
- openssh: secure shell (SSH) for secure access to remote machines
It was discovered that OpenSSH has an observable discrepancy leading to an
information leak in the algorithm negotiation. This update mitigates the
issue by tweaking the client hostkey preference ordering algorithm to
prefer the default ordering if the user has a key that matches the
best-preference default algorithm.
The problem can be corrected by updating your system to the following
Ubuntu 20.04 LTS:
Ubuntu 18.04 LTS (Available with Ubuntu Pro):
Ubuntu 16.04 LTS (Available with Ubuntu Pro):
Ubuntu 14.04 LTS (Available with Ubuntu Pro):
In general, a standard system update will make all the necessary changes.
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