Cisco Security Response: DoS in Cisco Clean Access

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Cisco Response

This is Cisco PSIRT's response to the statements made by Alex Lanstein
in his message: <DoS in Cisco Clean Access>, posted on 2005-Dec-16, to
the Bugtraq mailing list. An archived version of the report can be
found here:

We greatly appreciate the opportunity to work with researchers on
security vulnerabilities, and welcome the opportunity to review and
assist in product reports.

Additional Information

This issue is being tracked by Cisco bug ID:

* CSCsc85405 -- Obsolete JSPs can cause a DoS attack on CAM

This DDTS has been resolved and the fix is available.

It was discovered that certain obsolete JSP files may be leveraged to
leave the Cisco Clean Access Manager (CAM) open to a denial of service
(DoS) attack.

The patch is available to customers for download from:

The following information is from the README file that accompanies the
patch for CSCsc85405. For more complete information on the issue,
please consult the README.

To address and fix this vulnerability, you must remove the obsolete
JSP files from your CAM as they are no longer needed. You can either:

1. Install the patch on your CAM, as described in "Patch Installation Intructions" below, or

2. Apply the workaround, as described in "Workaround Solution" below.

Caveat CSCsc85405 will be resolved in the following future releases:

* Cisco Clean Access release 3.5(9) and above
* Cisco Clean Access release and above

Patch Installation Instructions

To install this patch:

1. Download the Patch-CSCsc85405.tar.gz file from the Cisco Clean
Access Patches folder
( under Cisco
Secure Software

2. Open an SSH terminal and copy the patch file into your Clean
Access Manager (CAM) using WinSCP, SSH File Transfer or PSCP, as
described below.

If using WinSCP or SSH File Transfer:

a. Copy Patch-CSCsc85405.tar.gz to the /store directory
on the Clean Access Manager.

If using PSCP:

a. Open a command prompt on your Windows computer.

b. Cd to the path where your PSCP resides
(e.g, C:\Documents and Settings\desktop).

c. Enter the following command to copy the file to the CAM:

pscp Patch-CSCsc85405.tar.gz root@ipaddress_manager:/store

3. From the SSH terminal, untar the patch file on the CAM:

cd /store
tar xzvf Patch-CSCsc85405.tar.gz

4. Cd to the Patch-CSCsc85405 directory:

cd Patch-CSCsc85405

5. Execute the patch file upgrade on the CAM:


Workaround Solution

The following workaround steps remove the affected .jsp files from the
CAM, as they are no longer needed.

1. Open an SSH terminal, and login to the CAM shell.

2. Change directory as follows:

cd /perfigo/control/tomcat/webapps/admin/

3. Remove the uploadclient.jsp and ieee8021x.jsp files:

rm -f uploadclient.jsp ieee8021x.jsp

4. Change directory as follows:

cd /perfigo/control/tomcat/work/Standalone/localhost/admin

5. Remove the cached jsp sources:

rm -f uploadclient_jsp.* ieee8021x_jsp.*

6. Remove any file in the "installer/window" directory, this will be
useful for any exploited machine.

rm -f /perfigo/control/tomcat/normal-webapps/installer/windows/*

Cisco Security Procedures

Complete information on reporting security vulnerabilities in Cisco
products, obtaining assistance with security incidents, and registering
to receive security information from Cisco, is available on Cisco's
worldwide website at
products_security_vulnerability_policy.html. This includes instructions
for press inquiries regarding Cisco security notices. All Cisco
security advisories are available at
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