USN-4098-1: wpa_supplicant and hostapd vulnerability

14 August 2019

wpa vulnerability

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

  • Ubuntu 19.04
  • Ubuntu 18.04 LTS


wpa_supplicant and hostapd could be made to expose sensitive information over the network.

Software Description

  • wpa - client support for WPA and WPA2


It was discovered that wpa_supplicant and hostapd were vulnerable to a side channel attack against EAP-pwd. A remote attacker could possibly use this issue to recover certain passwords.

Update instructions

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

Ubuntu 19.04
hostapd - 2:2.6-21ubuntu3.2
wpasupplicant - 2:2.6-21ubuntu3.2
Ubuntu 18.04 LTS
hostapd - 2:2.6-15ubuntu2.4
wpasupplicant - 2:2.6-15ubuntu2.4

To update your system, please follow these instructions:

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