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                                    CERT-Renater

                         Note d'Information No. 2008/VULN237
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DATE                      : 19/06/2008

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running Deterministic Network
                                  Enhancer driver, Cisco VPN Client.

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http://www.kb.cert.org/vuls/id/858993
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Vulnerability Note VU#858993

Deterministic Network Enhancer privilege escalation vulnerability


Overview

The Deterministic Network driver contains a privilege escalation
vulnerability, which can allow a local attacker to execute code with
kernel privileges.


I. Description

Deterministic Networks provides a product called Deterministic Network
Enhancer (DNE), which extends the Microsoft Windows networking stack.
DNE is packaged with multiple applications, including the Cisco VPN
Client. The DNE driver, which is provided by dne2000.sys, is vulnerable
to privilege escalation. By making a certain ioctl to the DNE device
driver, it is possible to execute code with windows kernel privileges.


II. Impact

A local attacker may be able to execute code with windows kernel
privileges.


III. Solution

Apply an update

This issue is addressed in dne2000.sys version 3.21.12.17902. This
driver is available from the DNE support page.

Cisco Windows VPN Client users should install version 5.0.03.0530, as
specified in Cisco Support document CSCsm25860.

For other products that provide the DNE driver, please check with the
vendor for updates.


Systems Affected

Vendor                           Status        Date Updated
Cisco Systems, Inc.             Vulnerable      18-Jun-2008
Deterministic Networks, Inc     Vulnerable      18-Jun-2008


References

http://www.digit-labs.org/files/exploits/dne2000-call.c
http://www.deterministicnetworks.com/support/dnesupport.asp
http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCsm25860
http://secunia.com/advisories/30747/


Credit

This vulnerability was reported by mu-b at Digit-Labs.

This document was written by Will Dormann.


Other Information
Date Public  06/17/2008
Date First Published  06/18/2008 11:16:29 AM
Date Last Updated  06/18/2008
CERT Advisory	
CVE Name	
US-CERT Technical Alerts	
Metric  22.50
Document Revision  3


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