USN-4136-1: wpa_supplicant and hostapd vulnerability

18 September 2019

wpa vulnerability

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

  • Ubuntu 19.04
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS

Summary

wpa_supplicant could be made to be disconnected and require reconnection to the network if it received a specially crafted management frame.

Software Description

  • wpa - client support for WPA and WPA2

Details

It was discovered that wpa_supplicant incorrectly handled certain management frames. An attacker could possibly use this issue to cause a denial of service.

Update instructions

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

Ubuntu 19.04
hostapd - 2:2.6-21ubuntu3.3
wpasupplicant - 2:2.6-21ubuntu3.3
Ubuntu 18.04 LTS
hostapd - 2:2.6-15ubuntu2.5
wpasupplicant - 2:2.6-15ubuntu2.5
Ubuntu 16.04 LTS
hostapd - 1:2.4-0ubuntu6.6
wpasupplicant - 2.4-0ubuntu6.6

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the necessary changes.

References