[USN-4136-1] wpa_supplicant and hostapd vulnerability

Leonidas S. Barbosa leo.barbosa at canonical.com
Wed Sep 18 14:01:27 UTC 2019

Ubuntu Security Notice USN-4136-1
September 18, 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


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


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

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


Package Information:
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