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TUCoPS :: Cisco :: bt743.txt

Cisco Aironet AP 1100 Malformed HTTP Request Crash Vulnerability

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:

Authors: Reda Zitouni (

Date: 28th July 2003

Advisory Code: VIGILANTE-2003001



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.



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:


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 . 

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).



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


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


CVE: Common Vulnerabilities and Exposures group ( reachable at ) was contacted and assigned CAN-2003-0511 to this 




Cisco Advisory:


Vigilante Advisory:


Product Homepage:

CVE: CAN-2003-0511




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 


Copyright, Inc. 2003-07-28



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