A GnuPG security update has been released for Ubuntu Linux 14.04 ESM and 16.04 ESM.

USN-5503-2: GnuPG vulnerability

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Ubuntu Security Notice USN-5503-2
July 12, 2022

gnupg, gnupg2 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

GnuPG could allow forged signatures.

Software Description:
- gnupg: GNU privacy guard - a free PGP replacement
- gnupg2: GNU privacy guard - a free PGP replacement

Details:

USN-5503-1 fixed a vulnerability in GnuPG. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Demi Marie Obenour discovered that GnuPG incorrectly handled injection in
the status message. A remote attacker could possibly use this issue to
forge signatures.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 ESM:
gnupg 1.4.20-1ubuntu3.3+esm2
gnupg2 2.1.11-6ubuntu2.1+esm1

Ubuntu 14.04 ESM:
gnupg 1.4.16-1ubuntu2.6+esm1

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5503-2
  https://ubuntu.com/security/notices/USN-5503-1
CVE-2022-34903