=========================================================================Ubuntu Security Notice USN-3964-1
May 02, 2019

python-gnupg vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.04
- Ubuntu 18.10
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in python-gnupg

Software Description:
- python-gnupg: Python wrapper for the GNU Privacy Guard 

Details:

Marcus Brinkmann discovered that GnuPG before 2.2.8 improperly handled certain
command line parameters. A remote attacker could use this to spoof the output of
GnuPG and cause unsigned e-mail to appear signed.
(CVE-2018-12020)

It was discovered that python-gnupg incorrectly handled the GPG passphrase. A
remote attacker could send a specially crafted passphrase that would allow them
to control the output of encryption and decryption operations.
(CVE-2019-6690)

Update instructions:

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

Ubuntu 19.04:
  python-gnupg                    0.4.3-1ubuntu1.19.04.1
  python3-gnupg                   0.4.3-1ubuntu1.19.04.1

Ubuntu 18.10:
  python-gnupg                    0.4.1-1ubuntu1.18.10.1
  python3-gnupg                   0.4.1-1ubuntu1.18.10.1

Ubuntu 18.04 LTS:
  python-gnupg                    0.4.1-1ubuntu1.18.04.1
  python3-gnupg                   0.4.1-1ubuntu1.18.04.1

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

References:
  https://ubuntu.com/security/notices/USN-3964-1
  CVE-2018-12020, CVE-2019-6690

Package Information:
  https://launchpad.net/ubuntu/+source/python-gnupg/0.4.3-1ubuntu1.19.04.1
  https://launchpad.net/ubuntu/+source/python-gnupg/0.4.1-1ubuntu1.18.10.1
  https://launchpad.net/ubuntu/+source/python-gnupg/0.4.1-1ubuntu1.18.04.1