A libbsd security update has been released for Ubuntu Linux 19.04, 18.04 LTS, 16.04 LTS, 14.04 ESM, and 12.04 ESM.

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Ubuntu Security Notice USN-4243-1
January 20, 2020

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in libbsd.

Software Description:
- libbsd: utility functions from BSD systems - development files

Details:

It was discovered that libbsd incorrectly handled certain inputs.
An attacker could possibly use this issue to execute arbitrary code.
This issue only affected Ubuntu 14.04 ESM. (CVE-2016-2090)

It was discovered that libbsd incorrectly handled certain strings.
An attacker could possibly use this issue to access sensitive information.
(CVE-2019-20367)

Update instructions:

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

Ubuntu 19.04:
libbsd0 0.9.1-2ubuntu0.1

Ubuntu 18.04 LTS:
libbsd0 0.8.7-1ubuntu0.1

Ubuntu 16.04 LTS:
libbsd0 0.8.2-1ubuntu0.1

Ubuntu 14.04 ESM:
libbsd0 0.6.0-2ubuntu1+esm1

Ubuntu 12.04 ESM:
libbsd0 0.3.0-2ubuntu0.1

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

References:
https://usn.ubuntu.com/4243-1
CVE-2016-2090, CVE-2019-20367

Package Information:
https://launchpad.net/ubuntu/+source/libbsd/0.9.1-2ubuntu0.1
https://launchpad.net/ubuntu/+source/libbsd/0.8.7-1ubuntu0.1
https://launchpad.net/ubuntu/+source/libbsd/0.8.2-1ubuntu0.1