Post Syndicated from original https://lwn.net/Articles/830538/rss

GNU Privacy Guard (GnuPG or GPG) has released version 2.2.23 to fix a critical security bug affecting GnuPG 2.2.21 and 2.2.22, as well as Gpg4win 3.1.12. “Importing an OpenPGP key having a preference list for AEAD algorithms
will lead to an array overflow and thus often to a crash or other
undefined behaviour.

Importing an arbitrary key can often easily be triggered by an attacker
and thus triggering this bug. Exploiting the bug aside from crashes is
not trivial but likely possible for a dedicated attacker. The major
hurdle for an attacker is that only every second byte is under their
control with every first byte having a fixed value of 0x04.

Software distribution verification should not be affected by this bug
because such a system uses a curated list of keys.”