INFORMATION BULLETIN

S-322: Deterministic Network Enhancer Vulnerability

[US-CERT Vulnerability Note VU#858993]

June 19, 2008 16:00 GMT


PROBLEM:	The Deterministic Network driver contains a privilege escalation vulnerability, which can allow a local attacker to execute code with kernel privileges.
PLATFORM:	Deterministic Network
DAMAGE:	Execute code.
SOLUTION:	Upgrade to the appropriate version.

VULNERABILITY ASSESSMENT:	The risk is MEDIUM. A local attakcer may be able to execute code with windows kernel privileges.

CVSS 2 BASE SCORE: TEMPORAL SCORE: VECTOR:	6.6 5.5 (AV:L/AC:L/Au:N/C:C/I:C/A:N/E:F/RL:OF/RC:C)

LINKS:
CIAC BULLETIN:	http://www.ciac.org/ciac/bulletins/s-322.shtml
ORIGINAL BULLETIN:	http://www.kb.cert.org/vuls/id/858993

[***** Start US-CERT Vulnerability Note VU#858993 *****]

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.

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
Blue Coat Systems	Vulnerable	19-Jun-2008
Cisco Systems, Inc.	Vulnerable	18-Jun-2008
Deterministic Networks, Inc	Vulnerable	18-Jun-2008
SafeNet	Vulnerable	19-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/30728/
http://secunia.com/advisories/30753/
http://secunia.com/advisories/30744/
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	06/19/2008
CERT Advisory
CVE Name
US-CERT Technical Alerts
Metric	22.50
Document Revision	6


[***** End US-CERT Vulnerability Note VU#858993 *****]

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