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DoS in Cisco Clean Access
Dec 16 2005 06:57PM
alex box sk
Date of release: 16/12/2005
Software: Cisco Clean Access/Perfigo CleanMachines (http://www.cisco.com/en/US/products/ps6128/index.html)
Affected versions: Tested on 3.5.5, assumed all <=current.
Discovered by: Alex Lanstein
Cisco Clean Access is an easily deployed Network Admission Control solution that can automatically detect, isolate, and clean infected or vulnerable devices that attempt to access your network - regardless of the access method. It identifies whether networked devices such as laptops, personal digital assistants, or even game consoles are compliant with your network's security policies, and repairs any vulnerabilities before permitting access to the network.
The software that is affected resides on the Secure Smart Manager, not the Secure Smart Server.
The method below has the possibility to create a denial of service on a few layers. One, a user without a username or password can use the vulnerability to upload files to a web visable folder for fun and profit. The user could also fill up the drive as it seems, aside from /boot, the rest of the drive is one big partition. Filling up the drive would most definately cause the system to lock up in its current configuration.
In /admin/uploadclient.jsp there is a lack of authentication check so that anyone who browses to the page can upload files directly to the web visable folder /installer/windows. This is clearly unacceptable.
Similar types of attacks can be launched from apply_firmware_action.jsp and file.jsp.
The vendor, Cisco Systems, should prepend _all_ files, especially all .jsp files, with an authentication check. This seems to be the case with most, but not all of the files.
The vendor should also use a better partitioning scheme in its installs.
Managers of these systems should add some sort of overall .htaccess/.htpasswd system while they are waiting for the vendor patch, as I'm sure that under further investigation by the engineers many more files are affected than those listed above.
External discussion and developments:
be .aware | http://www.awarenetwork.org/forum/viewtopic.php?p=2236
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