(RHSA-2015:1439) Low: wpa_supplicant security and enhancement update

The wpa_supplicant package contains an 802.1X Supplicant with support for
WEP, WPA, WPA2 (IEEE 802.11i / RSN), and various EAP authentication
methods. It implements key negotiation with a WPA Authenticator for client
stations and controls the roaming and IEEE 802.11 authentication and
association of the WLAN driver.

An integer underflow flaw, leading to a buffer over-read, was found in the
way wpa_supplicant handled WMM Action frames. A specially crafted frame
could possibly allow an attacker within Wi-Fi radio range to cause
wpa_supplicant to crash. (CVE-2015-4142)

This update includes the following enhancement:

• Prior to this update, wpa_supplicant did not provide a way to require the
  host name to be listed in an X.509 certificate’s Common Name or Subject
  Alternative Name, and only allowed host name suffix or subject substring
  checks. This update introduces a new configuration directive,
  ‘domain_match’, which adds a full host name check. (BZ#1186806)

All wpa_supplicant users are advised to upgrade to this updated package,
which contains a backported patch to correct this issue and adds this
enhancement. After installing this update, the wpa_supplicant service will
be restarted automatically.