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Ubuntu Security Notice USN-3964-1

Ubuntu Security Notice USN-3964-1
Posted May 2, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3964-1 - 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. 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. Various other issues were also addressed.

tags | advisory, remote, spoof, python
systems | linux, ubuntu
advisories | CVE-2018-12020, CVE-2019-6690
MD5 | 168d256d0381d7e3c65d21dcce6b5c85

Ubuntu Security Notice USN-3964-1

Change Mirror Download
==========================================================================
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://usn.ubuntu.com/usn/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

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