USN-3304-1: Sudo vulnerability

Ubuntu Security Notice USN-3304-1

30th May, 2017

sudo vulnerability

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

  • Ubuntu 17.04
  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

Sudo could be made to overwrite files as the administrator.

Software description

  • sudo - Provide limited super user privileges to specific users

Details

It was discovered that Sudo did not properly parse the contents of
/proc/[pid]/stat when attempting to determine its controlling tty.
A local attacker in some configurations could possibly use this to
overwrite any file on the filesystem, bypassing intended permissions.

Update instructions

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

Ubuntu 17.04:
sudo-ldap 1.8.19p1-1ubuntu1.1
sudo 1.8.19p1-1ubuntu1.1
Ubuntu 16.10:
sudo-ldap 1.8.16-0ubuntu3.2
sudo 1.8.16-0ubuntu3.2
Ubuntu 16.04 LTS:
sudo-ldap 1.8.16-0ubuntu1.4
sudo 1.8.16-0ubuntu1.4
Ubuntu 14.04 LTS:
sudo-ldap 1.8.9p5-1ubuntu1.4
sudo 1.8.9p5-1ubuntu1.4

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-2017-1000367