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Cisco Catalyst 6500 / Cisco 7600 Series Devices Accessible Loopback Address Weakness

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Release Date:  2007-09-27    Last Update:  2007-10-01    Views:  11,169

Secunia Advisory SA26988

Where:

From local network

Impact:

Security Bypass

Solution Status:

Vendor Patch

CVE Reference(s):

Description


A weakness has been reported in Cisco Catalyst 6500 and Cisco 7600 series devices, which can be exploited by malicious people to bypass certain security restrictions.

The problem is that packets destined for the 127.0.0.0/8 network may be received and processed by e.g. the Supervisor module or Multilayer Switch Feature Card (MSFC). This can be exploited to e.g. bypass existing access control lists.

Successful exploitation requires that systems are running Hybrid Mode (Catalyst OS (CatOS) software on the Supervisor Engine and IOS Software on the MSFC) or Native Mode (IOS Software on both the Supervisor Engine and the MSFC).

The weakness is reported in all software versions on Cisco Catalyst 6500 and Cisco 7600 series prior to 12.2(33)SXH.


Solution:
Update to 12.2(33)SXH.

Provided and/or discovered by:
The vendor credits Lee E. Rian.

Original Advisory:
Cisco:
http://www.cisco.com/warp/public/707/cisco-sr-20070926-lb.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 Catalyst 6500 / Cisco 7600 Series Devices Accessible Loopback Address Weakness

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