Vulnerability Note VU#730169

Atheros wireless network drivers may fail to properly handle malformed frames

Original Release date: 01 Aug 2007 | Last revised: 11 Dec 2007

Overview

Atheros wireless drivers fail to properly handle malformed wireless frames. This vulnerability may allow a remote, unauthenticated attacker to create a denial-of-service condition.

Description

Some versions of the Microsoft Windows drivers for Atheros 802.11 a/b/g wireless adapters fail to properly handle malformed frames. If a remote attacker within transmitting range of an affected wireless adapter sends a specially crafted frame to that adapter, they may be able to trigger this vulnerability.

This overflow occurs because the driver does not properly process management frames. An attacker within radio range may be able to trigger the overflow by sending a specially-crafted 802.11 management frame to a vulnerable system. Since 802.11b, 802.11g, and 802.11n management frames are not encrypted or authenticated, using wireless encryption (WEP/WPA) does not mitigate this vulnerability.

Note that Linux or Unix systems that use NDISWrapper or similar technologies to load the affected driver may also be vulnerable.

Impact

An unauthenticated, remote attacker may be able to create a denial-of-service condition.

Solution

Upgrade
Atheros has released an update (firmware versions 5.3.0.35 and 6.0.3.67 and later) to original equipment manufacturers to address this issue. Users should see the systems affected portion of this document for a partial list of affected vendors.


Disable the affected wireless adapter

Until updates can be applied, turning off the affected wireless adapter may mitigate this vulnerability.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Atheros Communications, Inc.Affected12 Feb 200711 May 2007
Secure Computing Network Security DivisionNot Affected16 May 200724 May 2007
Sun Microsystems, Inc.Not Affected16 May 200720 May 2007
3com, Inc.Unknown16 May 200716 May 2007
AlcatelUnknown16 May 200716 May 2007
Apple Computer, Inc.Unknown16 May 200716 May 2007
AT&TUnknown16 May 200716 May 2007
Avaya, Inc.Unknown16 May 200716 May 2007
Avici Systems, Inc.Unknown16 May 200716 May 2007
Borderware TechnologiesUnknown16 May 200716 May 2007
Charlotte's Web NetworksUnknown16 May 200716 May 2007
Check Point Software TechnologiesUnknown16 May 200716 May 2007
Chiaro Networks, Inc.Unknown16 May 200716 May 2007
Cisco Systems, Inc.Unknown11 May 200711 May 2007
ClavisterUnknown16 May 200716 May 2007
If you are a vendor and your product is affected, let us know.View More »

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A

References

Credit

Thanks to Nicholas Krasny of IBM Managed Security Services for information about this vulnerability and to Jeremy Kelley for reporting.

This document was written by Ryan Giobbi.

Other Information

  • CVE IDs: CVE-2007-2927
  • Date Public: 01 Aug 2007
  • Date First Published: 01 Aug 2007
  • Date Last Updated: 11 Dec 2007
  • Severity Metric: 0.77
  • Document Revision: 26

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