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             AUSCERT External Security Bulletin Redistribution

                       ESB-2008.0630 -- [Win][Cisco]
     Deterministic Network Enhancer privilege escalation vulnerability
                             19 November 2008


        AusCERT Security Bulletin Summary

Product:              Cisco Windows VPN Client
                      Deterministic Network Enhancer
Publisher:            US-CERT
Operating System:     Windows
Impact:               Administrator Compromise
Access:               Existing Account
CVE Names:            CVE-2008-5121

Original Bulletin:    http://www.kb.cert.org/vuls/id/858993

Revision History:  November 19 2008: Added CVE
                      June 19 2008: Initial Release

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Vulnerability Note VU#858993

Deterministic Network Enhancer privilege escalation vulnerability


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 This driver is 
available from the DNE support page.

Cisco Windows VPN Client users should install version, 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




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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