=========================================================================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://ubuntu.com/security/notices/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
