VIGILANTe Security Watch Advisory

Name: Cisco Aironet AP 1100 Malformed HTTP Request Crash Vulnerability

Systems Affected: Tested on a Cisco Aironet AP1100 Model 1120B Series

Wireless device.

Firmware version 12.2(4)JA and earlier.

Severity: High Risk

Vendor URL: http://www.vigilante.com

Authors: Reda Zitouni (reda.zitouni (at) vigilante (dot) com [email concealed])

Date: 28th July 2003

Advisory Code: VIGILANTE-2003001

Description

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Cisco Aironet 1100 Series Access Point is a device manufactured by Cisco

Systems offering a WLAN solution based on the 802.11b Wifi standard.

The Arionet Bridge is vulnerable to a denial of service.This can be

exploited remotely by an attacker. No user login or password is necessary.

Details

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It is possible to cause Cisco Aironet Access Point to crash and reboot if

the HTTP server feature is enabled. This can be accomplished by

submitting a specially crafted request to the web server. There is no

need to authenticate to perform this attack, only access to the web

server is required. The Aironet bridge reboots upon receiving the request

and failing to handle correctly this one. Afterwards, no further access

to the WLAN or its services is possible.

Vendor status:

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Cisco was contacted June 19, 2003 and answered the same day. 5 days

later, they told us that they would release a patch soon. The patch was

finally released July 3, 2003.

Vulnerability Assessment:

A test case to detect this vulnerability was added to SecureScan NX in

the upgrade package of July 28, 2003. You can see the documentation of

this test case 17655 on SecureScan NX web site at

http://securescannx.vigilante.com/tc/17655 .

Fix: A firmware upgrading the Aironet IOS version to c1100-k9w7 has been

released by Cisco. Please note that this version fixes some other bugs as

TC 15438 (refer to release note).

Workaround:

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1. If not needed - disable access to the web feature on the Aironet

Bridge.

2. If needed - restrict access to the HTTP service for outside

connections.

CVE: Common Vulnerabilities and Exposures group ( reachable at

http://cve.mitre.org/ ) was contacted and assigned CAN-2003-0511 to this

vulnerability.

Links:

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Cisco Advisory: http://www.cisco.com/warp/public/707/cisco-sa-

20030728-ap1x00.shtml

Vigilante Advisory:

http://www.vigilante.com/inetsecurity/advisories/VIGILANTE-

2003001.htm

Product Homepage: http://www.cisco.com/warp/public/cc/pd/witc/ps4570

CVE: CAN-2003-0511 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-

CAN-2003-0511

Credit:

******

This vulnerability was discovered by Reda Zitouni, member of our Security

Watch Team at VIGILANTe.

We wish to thank Cisco PSIRT Team for their fast answer to fix this

problem.

Copyright VIGILANTe.com, Inc. 2003-07-28

Disclaimer:

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The information within this document may change without notice. Use of

this information constitutes acceptance for use in an AS IS condition.

There are NO warranties with regard to this information. In no event

shall the author be liable for any consequences whatsoever arising out of

or in connection with the use or spread of this information. Any use of

this information lays within the user's responsibility.

Feedback:

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Please send suggestions, updates, and comments to

securitywatch (at) vigilante (dot) com. [email concealed]

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