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Check Point Zone Labs VSDATANT Multiple IOCTL Privilege Escalation Vulnerabilities

08.20.07

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/

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.

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.

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.

WORKAROUND

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

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

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.

DISCLOSURE TIMELINE

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

CREDIT

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

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LEGAL NOTICES

Copyright © 2007 Verisign, Inc.

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