nfs-utils vulnerability

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

* Ubuntu 20.04 LTS
* Ubuntu 19.10
* Ubuntu 18.04 LTS
* Ubuntu 16.04 LTS

Summary

nfs-utils could be made to overwrite files as the administrator.

Software Description

* nfs-utils - None

Details

It was discovered that the nfs-utils package set incorrect
permissions on the /var/lib/nfs directory. An attacker could
possibly use this issue to escalate privileges.

Update instructions

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

Ubuntu 20.04 LTS
nfs-common - 1:1.3.4-2.5ubuntu3.3

Ubuntu 19.10
nfs-common - 1:1.3.4-2.5ubuntu2.1

Ubuntu 18.04 LTS
nfs-common - 1:1.3.4-2.1ubuntu5.3

Ubuntu 16.04 LTS
nfs-common - 1:1.2.8-9ubuntu12.3

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

* CVE-2019-3689

--- Mystic BBS v1.12 A45 (Linux/64)
* Origin: BZ&BZ BBS (21:4/110)