[USN-4516-1] GnuPG vulnerability
marc.deslauriers at canonical.com
Thu Sep 17 19:02:00 UTC 2020
Ubuntu Security Notice USN-4516-1
September 17, 2020
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS
GnuPG could be made to expose sensitive information.
- gnupg2: GNU privacy guard - a free PGP replacement
It was discovered that GnuPG signatures could be forged when the SHA-1
algorithm is being used. This update removes validating signatures based on
SHA-1 that were generated after 2019-01-19. In environments where this is
still required, a new option --allow-weak-key-signatures can be used to
revert this behaviour.
The problem can be corrected by updating your system to the following
Ubuntu 18.04 LTS:
In general, a standard system update will make all the necessary changes.
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