USN-3483-1: procmail vulnerability

Ubuntu Security Notice USN-3483-1

20th November, 2017

procmail vulnerability

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

  • Ubuntu 17.10
  • Ubuntu 17.04
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


formail could be made to crash or run programs if it processed specially crafted mail.

Software description

  • procmail - Versatile e-mail processor


Jakub Wilk discovered that the formail tool incorrectly handled certain
malformed mail messages. An attacker could use this flaw to cause formail
to crash, resulting in a denial of service, or possibly execute arbitrary

Update instructions

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

Ubuntu 17.10:
procmail 3.22-25ubuntu0.17.10.1
Ubuntu 17.04:
procmail 3.22-25ubuntu0.17.04.1
Ubuntu 16.04 LTS:
procmail 3.22-25ubuntu0.16.04.1
Ubuntu 14.04 LTS:
procmail 3.22-21ubuntu0.2

To update your system, please follow these instructions:

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