Ubuntu 20.04 LTS: USN-4400-1 Critical: Nfs-Utils File Overwrite Risk

ubuntu

June 22, 2020

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

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.

Topics Covered

security advisory privilege escalation file overwrite Ubuntu nfs-utils

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

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