[USN-3968-2] Sudo vulnerability

[Leonidas S. Barbosa]

==========================================================================
Ubuntu Security Notice USN-3968-2
May 29, 2019

sudo vulnerability
==========================================================================

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

- Ubuntu 14.04 ESM

Summary:

Sudo could be made to overwrite files if it received a specially
crafted input.

Software Description:
- sudo: Provide limited super user privileges to specific users

Details:

USN-3968-1 fixed a vulnerability in Sudo. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory 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.
 (CVE-2017-1000368)

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+esm1
  sudo-ldap                       1.8.9p5-1ubuntu1.5+esm1

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

References:
  https://usn.ubuntu.com/usn/usn-3968-2
  https://usn.ubuntu.com/usn/usn-3968-1
  CVE-2017-1000368
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