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.

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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Copyright © 2007 iDefense, Inc.

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