Aruba Networks Advisory ID: AID-102609 - Malformed 802.11 Association Request frame causes Denial of Service condition on an Access Point

2009-10-28T00:00:00
ID SECURITYVULNS:DOC:22688
Type securityvulns
Reporter Securityvulns
Modified 2009-10-28T00:00:00

Description

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Aruba Networks Security Advisory

Title: Malformed 802.11 Association Request frame causes Denial of Service condition on an Access Point.

Aruba Advisory ID: AID-102609 Revision: 1.0

For Public Release on 10/26/2009

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SUMMARY

A Denial of Service (DoS) vulnerability was discovered during standard bug reporting procedures. A malformed 802.11 association request frame causes a crash on the Access Point (AP) causing a temporary DoS condition for wireless clients. Prior successful security association with the wireless network is not required to cause this condition. The AP recovers automatically by restarting itself.

AFFECTED ArubaOS VERSIONS

3.3.1.x, 3.3.2.x, RN 3.1.x, 3.4.x, 3.3.2.x-FIPS

Note: ArubaOS 2.5 is not affected by this issue.

DETAILS

Association Request management frame is used by wireless clients in a WLAN to initiate an association with the wireless network and negotiate various connection parameters. A malformed association frame may cause a crash on the Aruba APs. An attacking station does not need to have completed a successful security association prior to launching this attack since association frame is an unprotected management frame. This vulnerability affects all Aruba APs.

IMPACT

An attacker can inject a malformed association request frame and cause an AP to crash. This causes a service outage for all clients connected to that AP. The AP recovers automatically by restarting. An attacker could however cause a prolonged DoS condition by flooding the WLAN with malicious association request frames.

This vulnerability applies equally to both encrypted and unencrypted WLANs. This vulnerability does not affect wired devices connected the Aruba Mobility Controller.

CVSS v2 BASE METRIC SCORE: 6.1 (AV:A/AC:L/Au:N/C:N/I:N/A:C)

WORKAROUNDS

Aruba Networks recommends that all customers apply the appropriate patch(es) as soon as practical. There is no known workaround for this particular issue.

SOLUTION

Aruba Networks recommends that all customers apply the appropriate patch(es) as soon as practical.

The following patches have the fix (any newer patch will also have the fix):

        • 3.3.1.30
        • 3.3.2.18
        • RN 3.1.1
        • 3.4.0.3
        • 3.3.2.14-FIPS

Please note: We highly recommend that you upgrade your Mobility Controller to the latest available patch on the Aruba support site corresponding to your currently installed release.

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OBTAINING FIXED FIRMWARE

Aruba customers can obtain the firmware on the support website: http://www.arubanetworks.com/support.

Aruba Support contacts are as follows:

    1-800-WiFiLAN (1-800-943-4526) (toll free from within North America)

    +1-408-754-1200 (toll call from anywhere in the world)

    e-mail: support(at)arubanetworks.com

Please, do not contact either "wsirt(at)arubanetworks.com" or "security(at)arubanetworks.com" for software upgrades.

EXPLOITATION AND PUBLIC ANNOUNCEMENTS

This vulnerability will be announced at

Aruba W.S.I.R.T. Advisory: http://www.arubanetworks.com/support/alerts/aid-102609.asc

SecurityFocus Bugtraq http://www.securityfocus.com/archive/1

STATUS OF THIS NOTICE: Final

Although Aruba Networks cannot guarantee the accuracy of all statements in this advisory, all of the facts have been checked to the best of our ability. Aruba Networks does not anticipate issuing updated versions of this advisory unless there is some material change in the facts. Should there be a significant change in the facts, Aruba Networks may update this advisory.

A stand-alone copy or paraphrase of the text of this security advisory that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.

DISTRIBUTION OF THIS ANNOUNCEMENT

This advisory will be posted on Aruba's website at: http://www.arubanetworks.com/support/alerts/aid-102609.asc

Future updates of this advisory, if any, will be placed on Aruba's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.

REVISION HISTORY

  Revision 1.0 / 10-26-2009 / Initial release

ARUBA WSIRT SECURITY PROCEDURES

Complete information on reporting security vulnerabilities in Aruba Networks products, obtaining assistance with security incidents is available at http://www.arubanetworks.com/support/wsirt.php

For reporting NEW Aruba Networks security issues, email can be sent to wsirt(at)arubanetworks.com or security(at)arubanetworks.com. For sensitive information we encourage the use of PGP encryption. Our public keys can be found at http://www.arubanetworks.com/support/wsirt.php

  (c) Copyright 2009 by Aruba Networks, Inc.

This advisory may be redistributed freely after the release date given at the top of the text, provided that redistributed copies are complete and unmodified, including all date and version information. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

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