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Ubuntu Security Notice USN-4136-2
September 18, 2019

wpa, wpasupplicant vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

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
- wpasupplicant: client support for WPA and WPA2

Details:

USN-4136-1 fixed a vulnerability in wpa_supplicant. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory 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 14.04 ESM:
  hostapd                         1:2.1-0ubuntu1.7+esm2
  wpasupplicant                   2.1-0ubuntu1.7+esm2

Ubuntu 12.04 ESM:
  wpasupplicant                   0.7.3-6ubuntu2.5

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

References:
  https://usn.ubuntu.com/4136-2
  https://usn.ubuntu.com/4136-1
  CVE-2019-16275