Cisco Security Advisory-
Cisco Clean Access (CCA) is a software solution that can automatically detect, isolate, and clean infected or vulnerable devices that attempt to access your network. It consists of Cisco Clean Access Manager (CAM) and Cisco Clean Access Server (CAS) devices that work in tandem.
Cisco Clean Access is affected by the following vulnerabilities:
- Unchangeable shared secret
- Readable snapshot files
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Vulnerable Products
The following software releases are vulnerable.
Unchangeable Shared Secret
- CCA releases 3.6.x - 3.6.4.2
- CCA releases 4.0.x - 4.0.3.2
Readable Snapshots
- CCA releases 3.5.x - 3.5.9
- CCA releases 3.6.x - 3.6.1.1
Products Confirmed Not Vulnerable
No other Cisco products are known to be affected by the vulnerabilities described in this Advisory.
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Unchangeable Shared Secret
In order for Cisco Clean Access Manager (CAM) to authenticate to a Cisco Clean Access Server (CAS), both CAM and CAS must have the same shared secret. The shared secret is configured during the initial CAM and CAS setup. Due to this vulnerability the shared secret can not be properly set nor be changed, and it will be the same across all affected devices. In order to exploit this vulnerability the adversary must be able to establish a TCP connection to CAS.
This vulnerability is documented in Cisco Bug ID CSCsg24153 ( registered customers only) .
Readable Snapshots
Manual backups of the database ('snapshots') taken on CAM are susceptible to brute force download attacks. A malicious user can guess the file name and download it without authentication. The file itself is not encrypted or otherwise protected.
This vulnerability is documented in Cisco Bug ID CSCsd48626 ( registered customers only) .
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There are no workarounds for these vulnerabilities.
Possible mitigation of threat posed by readable snapshot files is to remove them from the device shortly after they were created. If the snapshot file needs to be preserved then it can be moved to a different computer or archived on a secondary storage. Alternately, the snapshot file can be deleted from the device.
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When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center ("TAC") or your contracted maintenance provider for assistance.
The following CCA software releases contain the fixes.
Unchangeable Shared Secret
The following software releases contain the fix for this vulnerability: 3.6.4.3, 4.0.4 and 4.1.0. All subsequent releases will contain the fix.
The alternative is to install the patch Patch-CSCsg24153.tar.gz which is available at http://www.cisco.com/pcgi-bin/tablebuild.pl/cca-patches. This patch provides the fix only for the Unchangeable Shared Secret issue and does not addreses any other vulnerability.
Readable Snapshots
The following software releases contain the fix for this vulnerability: 3.5.10 and 3.6.2. All subsequent releases will contain the fix.
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The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.
The readable snapshot issue was reported to Cisco by Chris Hartley from Ohio State University. The unchangeable shared secret was discovered while working on a customer's case and is unrelated to the Mr. Hartley's report.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show Less1.0
2007-Jan-03
Initial public release
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