[USN-3675-1] GnuPG vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3675-1
June 11, 2018

gnupg, gnupg2 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in GnuPG.

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

Details:

Marcus Brinkmann discovered that during decryption or verification,
GnuPG did not properly filter out terminal sequences when reporting the
original filename. An attacker could use this to specially craft a file
that would cause an application parsing GnuPG output to incorrectly
interpret the status of the cryptographic operation reported by GnuPG.
(CVE-2018-12020)

Lance Vick discovered that GnuPG did not enforce configurations where
key certification required an offline master Certify key. An attacker
with access to a signing subkey could generate certifications that
appeared to be valid. This issue only affected Ubuntu 18.04 LTS.
(CVE-2018-9234)

Update instructions:

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

Ubuntu 18.04 LTS:
  gnupg                           2.2.4-1ubuntu1.1
  gpg                             2.2.4-1ubuntu1.1

Ubuntu 17.10:
  gnupg                           2.1.15-1ubuntu8.1

Ubuntu 16.04 LTS:
  gnupg                           1.4.20-1ubuntu3.2

Ubuntu 14.04 LTS:
  gnupg                           1.4.16-1ubuntu2.5

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

References:
  https://usn.ubuntu.com/usn/usn-3675-1
  CVE-2018-12020, CVE-2018-9234

Package Information:
  https://launchpad.net/ubuntu/+source/gnupg2/2.2.4-1ubuntu1.1
  https://launchpad.net/ubuntu/+source/gnupg2/2.1.15-1ubuntu8.1
  https://launchpad.net/ubuntu/+source/gnupg/1.4.20-1ubuntu3.2
  https://launchpad.net/ubuntu/+source/gnupg/1.4.16-1ubuntu2.5

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