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Category:   Application (Generic)  >   wpa_supplicant Vendors:   Malinen, Jouni et al
(Red Hat Issues Fix) wpa_supplicant Integer Overflow in Processing WMM Action Frames Lets Remote Users
SecurityTracker Alert ID:  1033054
SecurityTracker URL:  http://securitytracker.com/id/1033054
CVE Reference:   CVE-2015-4142   (Links to External Site)
Date:  Jul 24 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in wpa_supplicant. A remote user can cause denial of service conditions on the target system.

A remote user on the wireless network can send a specially crafted Wifi Multimedia (WMM) Action frame to cause the target wpa_supplicant to crash.

The original advisory is available at:

http://w1.fi/security/2015-3/integer-underflow-in-ap-mode-wmm-action-frame.txt

Kostya Kortchinsky of Google Security Team reported this vulnerability.

Impact:   A remote user on the wireless network can cause denial of service conditions.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-1439.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-1439.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Jun 18 2015 wpa_supplicant Integer Overflow in Processing WMM Action Frames Lets Remote Users



 Source Message Contents

Subject:  [RHSA-2015:1439-01] Low: wpa_supplicant security and enhancement update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Low: wpa_supplicant security and enhancement update
Advisory ID:       RHSA-2015:1439-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1439.html
Issue date:        2015-07-22
Updated on:        2015-05-27
CVE Names:         CVE-2015-4142 
=====================================================================

1. Summary:

An updated wpa_supplicant package that fixes one security issue and adds
one enhancement is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Low security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

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.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1221178 - CVE-2015-4142 wpa_supplicant and hostapd: integer underflow in AP mode WMM Action frame processing

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
wpa_supplicant-0.7.3-6.el6.src.rpm

i386:
wpa_supplicant-0.7.3-6.el6.i686.rpm
wpa_supplicant-debuginfo-0.7.3-6.el6.i686.rpm

x86_64:
wpa_supplicant-0.7.3-6.el6.x86_64.rpm
wpa_supplicant-debuginfo-0.7.3-6.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
wpa_supplicant-0.7.3-6.el6.src.rpm

x86_64:
wpa_supplicant-0.7.3-6.el6.x86_64.rpm
wpa_supplicant-debuginfo-0.7.3-6.el6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
wpa_supplicant-0.7.3-6.el6.src.rpm

i386:
wpa_supplicant-0.7.3-6.el6.i686.rpm
wpa_supplicant-debuginfo-0.7.3-6.el6.i686.rpm

ppc64:
wpa_supplicant-0.7.3-6.el6.ppc64.rpm
wpa_supplicant-debuginfo-0.7.3-6.el6.ppc64.rpm

s390x:
wpa_supplicant-0.7.3-6.el6.s390x.rpm
wpa_supplicant-debuginfo-0.7.3-6.el6.s390x.rpm

x86_64:
wpa_supplicant-0.7.3-6.el6.x86_64.rpm
wpa_supplicant-debuginfo-0.7.3-6.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
wpa_supplicant-0.7.3-6.el6.src.rpm

i386:
wpa_supplicant-0.7.3-6.el6.i686.rpm
wpa_supplicant-debuginfo-0.7.3-6.el6.i686.rpm

x86_64:
wpa_supplicant-0.7.3-6.el6.x86_64.rpm
wpa_supplicant-debuginfo-0.7.3-6.el6.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-4142
https://access.redhat.com/security/updates/classification/#low

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2015 Red Hat, Inc.
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