USN-3304-1: Sudo vulnerability
Ubuntu Security Notice USN-3304-1
30th May, 2017
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
Sudo could be made to overwrite files as the administrator.
- sudo - Provide limited super user privileges to specific users
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.
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.