USN-3421-1: Libidn2 vulnerability

Ubuntu Security Notice USN-3421-1

18th September, 2017

libidn2-0 vulnerability

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

• Ubuntu 17.04

Summary

Libidn2 could be made to crash if it received specially crafted
input.

Software description

• libidn2-0
  - Internationalized domain names (IDNA2008) library
  
  

Details

It was discovered that Libidn2 incorrectly handled certain input. A
remote attacker could possibly use this issue to cause Libidn2 to crash,
resulting in a denial of service.

Update instructions

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

Ubuntu 17.04:

To update your system, please follow these instructions: