|
Cisco Multiple Products Wireless ARP Requests Denial of Service
|
|
Secunia Advisory:
|
SA26161
|
|
|
Release Date:
|
2007-07-25
|
|
Last Update:
|
2007-07-27
|
|
Popularity:
|
14,628 views
|
|
|
Critical:
|
Moderately critical
|
|
Impact:
|
DoS
|
|
Where:
|
From local network
|
|
Solution Status:
|
Partial Fix
|
|
| OS: | Cisco 4400 Series Wireless LAN Controller
Cisco Catalyst 3750 Series Integrated Wireless LAN Controllers
|
|
| Software: | Cisco Catalyst 6500 Series Wireless Service Module (WiSM)
|
|
|
Subscribe:
|
Instant alerts on relevant vulnerabilities 
|
|
| CVE reference: | CVE-2007-4011
CVE-2007-4012
|
|
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:
Reportedly, an update will be available 27-July-2007.
Version 4.0:
Reportedly, an update will be available 27-July-2007.
Version 4.1:
Update to version 4.1.181.0.
Provided and/or discovered by:
Reported to the vendor by customers.
Changelog:
2007-07-27: Added CVE reference.
Original Advisory:
http://www.cisco.com/warp/public/707/cisco-sa-20070724-arp.shtml
Extended Solution:
The "Extended Solution" section is available for Secunia customers only. Request a trial and get access to the Secunia Customer Area and Extended Secunia advisories.
|
|
|
Track this Secunia Advisory
|
Customers of the Secunia Vulnerability Intelligence solutions will automatically receive updates when new information regarding this advisory is released.
Read more about our Vulnerability Intelligence solutions and what they can do for you and your company.
|
|
|
About this Secunia Advisory
|
Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
|
