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Check Point Zone Labs SRESCAN IOCTL Local Privilege Escalation Vulnerability

04.20.07

BACKGROUND

Zone Alarm products provide security solutions such as anti-virus, firewall, spy-ware, and ad-ware protection. The srescan.sys device driver contains the Spyware Removal Engine portion of these products. More information is available at the Zone Labs web site at the following URL.

http://www.zonelabs.com/

DESCRIPTION

Local exploitation of multiple design error vulnerabilities within multiple Check Point Zone Alarm products could allow an attacker to gain elevated privileges.

The problem specifically exists within the IOCTL handling code in the srescan.sys device driver. The device driver fails to validate user-land supplied addresses passed to IOCTL 0x22208F and IOCTL 0x2220CF.

Since the Irp parameters are not correctly validated, an attacker could utilize this IOCTL to overwrite arbitrary memory. In the case of IOCTL 0x2220CF, the attacker can write the constant double-word value of 0x30000. In the case of IOCTL 0x22208F, the attacker can write the contents of a buffer returned from ZwQuerySystemInformation.

ANALYSIS

Exploitation allows an attacker to execute arbitrary code within the context of the kernel.

The access control mechanisms under a default installation allow restricted accounts to access the affected device drivers. This allows elevation of privileges directly to SYSTEM.

DETECTION

iDefense has confirmed the existence of these vulnerabilities within version version 5.0.63.0 of srescan.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

The Zone Labs Security Team reports that these issues are "fixed in versions 5.0.156.0 of the ZoneAlarm Spyware Removal Engine (SRE) and higher. The currently deployed version of SRE in ZoneAlarm is 5.0.162.0."

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

DISCLOSURE TIMELINE

12/19/2006 Initial vendor notification
12/20/2006 Initial vendor response
03/21/2007 Second vendor notification
03/22/2007 Second vendor response
04/20/2007 Coordinated public disclosure

CREDIT

This vulnerability was reported to iDefense by Ruben Santamarta of reversemode.com.

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LEGAL NOTICES

Copyright © 2007 Verisign, Inc.

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