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AUSCERT External Security Bulletin Redistribution
ESB-2008.0630 -- [Win][Cisco]
Deterministic Network Enhancer privilege escalation vulnerability
19 November 2008
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Windows VPN Client
Deterministic Network Enhancer
Publisher: US-CERT
Operating System: Windows
Cisco
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
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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