iDefense Security Advisory 08.20.07: Check Point Zone Labs VSDATANT Multiple IOCTL Privilege Escalation Vulnerabilities

Check Point Zone Labs VSDATANT Multiple IOCTL Privilege Escalation Vulnerabilities

iDefense Security Advisory 08.20.07
http://labs.idefense.com/intelligence/vulnerabilities/ Aug 20, 2007

I. BACKGROUND Zone Alarm products provide security solutions such as anti-virus, firewall, spy-ware, and ad-ware protection. The vsdatant.sys driver, also known as the TrueVector Device Driver, is the core firewall driver in ZoneAlarm products. More information is available at the Zone Labs web site at the following URL.

http://www.zonelabs.com/

II. DESCRIPTION Local exploitation of multiple input validation vulnerabilities within multiple Check Point Zone Alarm products could allow an attacker to execute arbitrary code in kernel (ring0) context.

The problems specifically exist within the IOCTL handling code in the vsdatant.sys device driver. The device driver fails to validate user-land supplied addresses passed to IOCTL 0x8400000F and IOCTL 0x84000013.

Since the Irp parameters are not correctly validated, an attacker could utilize these IOCTLs to overwrite arbitrary memory with the constant double-word value of 0x60001 or the contents of a buffer returned from ZwQuerySystemInformation. This includes kernel memory as well as the code segments of running processes.

III. ANALYSIS Exploitation allows an attacker to gain complete control of the affected machine. The access control mechanisms under a default installation allow restricted accounts to access the affected device drivers.

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IV. DETECTION iDefense has confirmed the existence of these vulnerabilities within version 6.5.737.0 of vsdatant.sys as installed with Check Point Zone Labs Zone Alarm Free. All other products within the Zone Alarm product line are suspected to be vulnerable. Previous versions are also suspected to be vulnerable.

V. WORKAROUND Changing the access control mechanisms for the affected device drivers will prevent exploitation by restricted accounts.

VI. VENDOR RESPONSE Check Point Zone Labs has addressed these vulnerabilities in version 7.0.362 of their ZoneAlarm products. For more information, consult the Check Point Zone Labs download page at the following URL.

http://www.zonealarm.com/store/content/catalog/products/trial_zaFamily/trial_zaFamily.jsp

VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-4216 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

VIII. DISCLOSURE TIMELINE

12/19/2006  Initial vendor notification
12/20/2006  Initial vendor response
08/20/2007  Coordinated public disclosure

IX. CREDIT These vulnerabilities were reported to iDefense by Ruben Santamarta of reversemode.com.

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X. LEGAL NOTICES Copyright © 2007 iDefense, Inc.

Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customerservice@idefense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition.  There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information. Received on Mon Aug 20 11:57:13 2007