USN-4263-1: Sudo vulnerability

3 February 2020

sudo vulnerability

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

  • Ubuntu 19.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


Sudo could allow unintended access to the administrator account.

Software Description

  • sudo - Provide limited super user privileges to specific users


Joe Vennix discovered that Sudo incorrectly handled memory operations when the pwfeedback option is enabled. A local attacker could possibly use this issue to obtain unintended access to the administrator account.

Update instructions

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

Ubuntu 19.10
sudo - 1.8.27-1ubuntu4.1
sudo-ldap - 1.8.27-1ubuntu4.1
Ubuntu 18.04 LTS
sudo - 1.8.21p2-3ubuntu1.2
sudo-ldap - 1.8.21p2-3ubuntu1.2
Ubuntu 16.04 LTS
sudo - 1.8.16-0ubuntu1.9
sudo-ldap - 1.8.16-0ubuntu1.9

To update your system, please follow these instructions:

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