USN-3143-1: c-ares vulnerability

Ubuntu Security Notice USN-3143-1

30th November, 2016

c-ares vulnerability

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

• Ubuntu 16.10



• Ubuntu 16.04 LTS



• Ubuntu 14.04 LTS



• Ubuntu 12.04 LTS

Summary

c-ares could be made to crash or run programs if it processed a specially
crafted hostname.

Software description

• c-ares
  - library for asynchronous name resolves
  
  

Details

Gzob Qq discovered that c-ares incorrectly handled certain hostnames. A
remote attacker could use this issue to cause applications using c-ares to
crash, resulting in a denial of service, or possibly execute arbitrary
code.

Update instructions

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

Ubuntu 16.10:

Ubuntu 16.04 LTS:

Ubuntu 14.04 LTS:

Ubuntu 12.04 LTS:

To update your system, please follow these instructions: