Advisory ID: cisco-sa-20010307-aironet340
For Public Release 2001 March 7 16:00 UTC (GMT)
It is possible to view and modify the bridge's configuration via Web
interface even when Web access is disabled in the configuration. This defect is
documented as Cisco bug ID CSCdt52783. This defect is present in the following
Cisco Aironet AIR-BR340
The firmware release 8.55 is the first image which contains the fix.
All previous firmware releases for listed devices are vulnerable. No other
Aironet/Cisco Aironet wireless product is affect by this vulnerability. This
advisory is available at the
This section provides details on affected products.
The following hardware models are affected:
Cisco Aironet AIR-BR340
They are vulnerable to this defect if they are running any of the
following firmware releases:
The release 8.55 is the first release where this vulnerability is
fixed. No other Aironet/Cisco Aironet wireless products are affected by this
No other Cisco products are currently known to be affected by these
It is possible to view and modify the bridge's configuration, using Web
interface, despite it being explicitly disabled. This vulnerability is
exploitable over the wired and wireless link alike.
Cisco has provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.
CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.
Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.
Cisco has provided an FAQ to answer additional questions regarding CVSS at
Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at
An attacker is able to modify the bridge's configuration. It is
necessary for an attacker to obtain connectivity to the bridge. That can be
done either using wired or wireless Ethernet interface.
This defect is fixed in the release 8.55 of the software.
There is no workaround if an attack is coming from wired Ethernet
To mitigate this vulnerability if an attack is coming over the wireless
link the following actions may be taken:
Change SSID to non guessable value.
Turn on WEP encryption if possible.
On bridges (BR100, BR500 and AIR-BR340) turn off access point mode.
That will disallow direct access to the bridge by any client.
For the instruction on how to perform these operations on the Cisco
Aironet 340 Series Wireless Bridge, please see:
For more detailed description please consult "Using the Cisco Aironet
340 Series Wireless Bridges", which can be found at:
Information on SSID and other basic settings is on page 4-3. Information on
bridge mode vs AP mode is on page 4-17.
Cisco has made free software available to address this vulnerability
for affected customers. Prior to deploying software, customers should consult
their maintenance provider or check the software for feature set compatibility
and known issues specific to their environment.
Customers may only install and expect support for the feature sets they
have purchased. By installing, downloading, accessing or otherwise using such
software upgrades, customers agree to be bound by the terms of Cisco's software
license terms found at
or as otherwise set forth at Cisco.com Downloads at
Do not contact either "email@example.com" or "firstname.lastname@example.org"
for software upgrades.
Customers with contracts should obtain upgraded software through their
regular update channels. For most customers, this means that upgrades should be
obtained through the Software Center on Cisco's worldwide website at
Customers whose Cisco products are provided or maintained through prior
or existing agreement with third-party support organizations such as Cisco
Partners, authorized resellers, or service providers should contact that
support organization for guidance and assistance with the appropriate course of
action in regards to this advisory.
The effectiveness of any workaround or fix is dependent on specific
customer situations such as product mix, network topology, traffic behavior,
and organizational mission. Due to the variety of affected products and
releases, customers should consult with their service provider or support
organization to ensure any applied workaround or fix is the most appropriate
for use in the intended network before it is deployed.
Customers who purchase direct from Cisco but who do not hold a Cisco
service contract and customers who purchase through third-party vendors but are
unsuccessful at obtaining fixed software through their point of sale should get
their upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC
contacts are as follows.
+1 800 553 2447 (toll free from within North America)
+1 408 526 7209 (toll call from anywhere in the world)
Have your product serial number available and give the URL of this
notice as evidence of your entitlement to a free upgrade. Free upgrades for
non-contract customers must be requested through the TAC.
for additional TAC contact information, including special localized telephone
numbers and instructions and e-mail addresses for use in various
The Cisco PSIRT is not aware of any public announcements or malicious
use of the vulnerabilities described in this advisory. This vulnerability was
discovered by a customer.
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A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.
This notice will be posted on Cisco's Worldwide Web site at
In addition to Worldwide Web posting, a text version of this notice is
clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail
and Usenet news recipients:
email@example.com (includes CERT/CC)
Various internal Cisco mailing lists
Future updates of this notice, if any, will be placed on Cisco's
Worldwide Web server, but may or may not be actively announced on mailing lists
or newsgroups. Users concerned about this problem are encouraged to check the
URL given above for any updates.
Initial public release.