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Moderately critical

Cisco Multiple Products Wireless ARP Requests Denial of Service

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Release Date:  2007-07-25    Last Update:  2007-07-27    Views:  20,027

Secunia Advisory SA26161

Where:

From local network

Impact:

DoS

Solution Status:

Partial Fix

CVE Reference(s):

Description


Some vulnerabilities have been reported in multiple Cisco products, which can be exploited by malicious people to cause a DoS (Denial of Service).

1) Certain Cisco Wireless Lan Controllers (WLCs) do not correctly handle unicast ARP requests from MAC addresses that are unknown to the Layer-2 infrastructure, causing a second WLC to incorrectly re-forward the ARP request back into the network.

Successful exploitation allows to cause a DoS due to heavy network traffic, but requires that two WLCs are attached to the same set of Layer-2 VLANs and each have a context for the wireless client, e.g. if a guest WLAN (auto-anchor) is used or after a Layer-3 (cross-subnet) roam.

2) Broadcast ARP packets for the IP address of a known client context are not correctly handled and re-forwarded into the network.

Successful exploitation allows to cause a DoS due to heavy network traffic, but requires that more than 1 WLC is installed for the corresponding network and that the arpunicast feature is enabled.

Note: This affects version 4.1 only.

3) In certain Layer-3 (L3) roaming scenarios (e.g. when wireless clients move from one controller to another and the wireless LAN interfaces are configured on different controllers which are on different IP subnets), a foreign controller may send a unicast ARP request out to a local VLAN.

The vulnerabilities are reported in software versions 4.1, 4.0, 3.2, and prior in for the following products:
* Cisco 4100 Series Wireless LAN Controllers
* Cisco 4400 Series Wireless LAN Controllers
* Cisco Airespace 4000 Series Wireless LAN Controller
* Cisco Catalyst 6500 Series Wireless Services Module (WiSM)
* Cisco Catalyst 3750 Series Integrated Wireless LAN Controllers


Solution:
Version 3.2:

Further details available to Secunia VIM customers

Provided and/or discovered by:
Reported to the vendor by customers.

Original Advisory:
http://www.cisco.com/warp/public/707/cisco-sa-20070724-arp.shtml

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Cisco Multiple Products Wireless ARP Requests Denial of Service

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