Exploit the possiblities

FreeBSD Security Advisory - FreeBSD-SA-17:07.wpa

FreeBSD Security Advisory - FreeBSD-SA-17:07.wpa
Posted Oct 19, 2017
Authored by Mathy Vanhoef | Site security.freebsd.org

FreeBSD Security Advisory - A vulnerability was found in how a number of implementations can be triggered to reconfigure WPA/WPA2/RSN keys (TK, GTK, or IGTK) by replaying a specific frame that is used to manage the keys. Such reinstallation of the encryption key can result in two different types of vulnerabilities: disabling replay protection and significantly reducing the security of encryption to the point of allowing frames to be decrypted or some parts of the keys to be determined by an attacker depending on which cipher is used.

tags | advisory, vulnerability
systems | freebsd, bsd
advisories | CVE-2017-13077, CVE-2017-13078, CVE-2017-13079, CVE-2017-13080, CVE-2017-13081, CVE-2017-13082, CVE-2017-13086, CVE-2017-13087, CVE-2017-13088
MD5 | dd1ceecd8830ca90a5666d6a9425ade7

FreeBSD Security Advisory - FreeBSD-SA-17:07.wpa

Change Mirror Download
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

=============================================================================
FreeBSD-SA-17:07.wpa Security Advisory
The FreeBSD Project

Topic: WPA2 protocol vulnerability

Category: contrib
Module: wpa
Announced: 2017-10-16
Credits: Mathy Vanhoef
Affects: All supported versions of FreeBSD.
Corrected: 2017-10-17 17:30:18 UTC (stable/11, 11.1-STABLE)
2017-10-17 17:57:18 UTC (releng/11.1, 11.1-RELEASE-p2)
2017-10-17 17:56:03 UTC (releng/11.0, 11.0-RELEASE-p13)
2017-10-19 03:18:22 UTC (stable/10, 10.4-STABLE)
2017-10-19 03:20:17 UTC (releng/10.4, 10.4-RELEASE-p1)
2017-10-19 03:19:42 UTC (releng/10.3, 10.3-RELEASE-p22)
CVE Name: CVE-2017-13077, CVE-2017-13078, CVE-2017-13079,
CVE-2017-13080, CVE-2017-13081, CVE-2017-13082,
CVE-2017-13086, CVE-2017-13087, CVE-2017-13088

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:https://security.FreeBSD.org/>.

0. Revision history

v1.0 2017-10-17 Initial release.
v1.1 2017-10-19 Add patches for 10.x releases.

I. Background

Wi-Fi Protected Access II (WPA2) is a security protocol developed by the
Wi-Fi Alliance to secure wireless computer networks.

hostapd and wpa_supplicant are implementations of user space daemon for
access points and wireless client that implements the WPA2 protocol.

II. Problem Description

A vulnerability was found in how a number of implementations can be
triggered to reconfigure WPA/WPA2/RSN keys (TK, GTK, or IGTK) by
replaying a specific frame that is used to manage the keys.

III. Impact

Such reinstallation of the encryption key can result in two different
types of vulnerabilities: disabling replay protection and significantly
reducing the security of encryption to the point of allowing frames to
be decrypted or some parts of the keys to be determined by an attacker
depending on which cipher is used.

IV. Workaround

An updated version of wpa_supplicant is available in the FreeBSD Ports
Collection. Install version 2.6_2 or later of the
security/wpa_supplicant port/pkg. Once installed, update /etc/rc.conf
to use the new binary:

wpa_supplicant_program="/usr/local/sbin/wpa_supplicant"

and restart networking.

An updated version of hostapd is available in the FreeBSD Ports
Collection. Install version 2.6_1 or later of the net/hostapd port/pkg.
Once installed, update /etc/rc.conf to use the new binary:

hostapd_program="/usr/local/sbin/hostapd"

and restart hostapd.

V. Solution

Perform one of the following:

1) Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date.

Restart the Wi-Fi network interfaces/hostapd or reboot the system.

2) To update your vulnerable system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

Restart the Wi-Fi network interfaces/hostapd or reboot the system.

3) To update your vulnerable system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

[FreeBSD 11.0-RELEASE, 11.1-RELEASE, and 11-STABLE]
# fetch https://security.FreeBSD.org/patches/SA-17:07/wpa-11.patch
# fetch https://security.FreeBSD.org/patches/SA-17:07/wpa-11.patch.asc
# gpg --verify wpa-11.patch.asc

[FreeBSD 10.3-RELEASE, 10.4-RELEASE, and 10-STABLE]
# fetch https://security.FreeBSD.org/patches/SA-17:07/wpa-10.patch
# fetch https://security.FreeBSD.org/patches/SA-17:07/wpa-10.patch.asc
# gpg --verify wpa-10.patch.asc

b) Apply the patch. Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile the operating system using buildworld and installworld as
described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.

Restart the applicable daemons, or reboot the system.

VI. Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path Revision
- -------------------------------------------------------------------------
stable/11/ r324697
releng/11.0/ r324698
releng/11.1/ r324699
stable/10/ r324739
releng/10.3/ r324740
releng/10.4/ r324741
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:https://w1.fi/security/2017-1/wpa-packet-number-reuse-with-replayed-messages.txt>
<URL:https://www.krackattacks.com/>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-17:07.wpa.asc>
-----BEGIN PGP SIGNATURE-----
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=h/5q
-----END PGP SIGNATURE-----

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

November 2017

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Nov 1st
    22 Files
  • 2
    Nov 2nd
    28 Files
  • 3
    Nov 3rd
    10 Files
  • 4
    Nov 4th
    1 Files
  • 5
    Nov 5th
    5 Files
  • 6
    Nov 6th
    15 Files
  • 7
    Nov 7th
    15 Files
  • 8
    Nov 8th
    13 Files
  • 9
    Nov 9th
    9 Files
  • 10
    Nov 10th
    9 Files
  • 11
    Nov 11th
    3 Files
  • 12
    Nov 12th
    2 Files
  • 13
    Nov 13th
    15 Files
  • 14
    Nov 14th
    17 Files
  • 15
    Nov 15th
    19 Files
  • 16
    Nov 16th
    15 Files
  • 17
    Nov 17th
    19 Files
  • 18
    Nov 18th
    0 Files
  • 19
    Nov 19th
    0 Files
  • 20
    Nov 20th
    0 Files
  • 21
    Nov 21st
    0 Files
  • 22
    Nov 22nd
    0 Files
  • 23
    Nov 23rd
    0 Files
  • 24
    Nov 24th
    0 Files
  • 25
    Nov 25th
    0 Files
  • 26
    Nov 26th
    0 Files
  • 27
    Nov 27th
    0 Files
  • 28
    Nov 28th
    0 Files
  • 29
    Nov 29th
    0 Files
  • 30
    Nov 30th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2016 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close