USN-4263-2: Sudo vulnerability

5 February 2020

sudo vulnerability

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

  • Ubuntu 14.04 ESM
  • Ubuntu 12.04 ESM


Sudo could allow unintended access to the administrator account.

Software Description

  • sudo - Provide limited super user privileges to specific users


USN-4263-1 fixed a vulnerability in Sudo. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

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 14.04 ESM
sudo - 1.8.9p5-1ubuntu1.5+esm3
sudo-ldap - 1.8.9p5-1ubuntu1.5+esm3
Ubuntu 12.04 ESM
sudo - 1.8.3p1-1ubuntu3.9
sudo-ldap - 1.8.3p1-1ubuntu3.9

To update your system, please follow these instructions:

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