Advisory Published

USN-3675-1: GnuPG vulnerabilities

First published: Mon Jun 11 2018(Updated: )

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 primary 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)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/gnupg<2.2.4-1ubuntu1.1
2.2.4-1ubuntu1.1
=18.04
All of
ubuntu/gpg<2.2.4-1ubuntu1.1
2.2.4-1ubuntu1.1
=18.04
All of
ubuntu/gnupg<2.1.15-1ubuntu8.1
2.1.15-1ubuntu8.1
=17.10
All of
ubuntu/gnupg<1.4.20-1ubuntu3.2
1.4.20-1ubuntu3.2
=16.04
All of
ubuntu/gnupg<1.4.16-1ubuntu2.5
1.4.16-1ubuntu2.5
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-3675-1?

    The severity of USN-3675-1 is high.

  • What is the affected software for USN-3675-1?

    The affected software for USN-3675-1 is GnuPG.

  • How can an attacker exploit USN-3675-1?

    An attacker can exploit USN-3675-1 by crafting a file that causes a application parsing GnuPG output to incorrectly interpret the status.

  • How can I fix USN-3675-1?

    To fix USN-3675-1, update GnuPG to version 2.2.4-1ubuntu1.1 or later.

  • Where can I find more information about USN-3675-1?

    You can find more information about USN-3675-1 at the following references: - [CVE-2018-12020](https://ubuntu.com/security/CVE-2018-12020) - [CVE-2018-9234](https://ubuntu.com/security/CVE-2018-9234) - [USN-3675-3](https://ubuntu.com/security/notices/USN-3675-3)

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