Ubuntu 14.04 LTS / 16.04 LTS / 17.10 / 18.04 LTS : gnupg, gnupg2 vulnerabilities (USN-3675-1)

Medium Nessus Plugin ID 110475

Synopsis

The remote Ubuntu host is missing one or more security-related patches.

Description

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).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected gnupg and / or gpg packages.

Plugin Details

Severity: Medium

ID: 110475

File Name: ubuntu_USN-3675-1.nasl

Version: 1.3

Type: local

Agent: unix

Published: 2018/06/12

Modified: 2018/08/02

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:gnupg, p-cpe:/a:canonical:ubuntu_linux:gpg, cpe:/o:canonical:ubuntu_linux:14.04, cpe:/o:canonical:ubuntu_linux:16.04, cpe:/o:canonical:ubuntu_linux:17.10, cpe:/o:canonical:ubuntu_linux:18.04:-:lts

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Patch Publication Date: 2018/06/11

Reference Information

CVE: CVE-2018-12020, CVE-2018-9234

USN: 3675-1