Check Point Advisories

Microsoft VBScript MsgBox Call with Malicious HLP File (CVE-2010-0483)

Vulnerability
Protection

Check Point Reference:	CPAI-2010-049
Date Published:	2 Mar 2010
Severity:	Critical
Last Updated:	Tuesday 02 March, 2010
Source:
Industry Reference:	CVE-2010-0483
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description	A remote code execution vulnerability has been discovered in the way that VBScript interacts with Windows Help files when using Internet Explorer. The vulnerability is due to the VBScript functionality available from within Internet Explorer that exposes the MsgBox function, allowing script on a web page to display a message to the user. The parameters supplied to the MsgBox function may reference an associated Window Help file. A remote attacker could exploit this issue by convincing a user to visit a malicious Web page that contains a dialog box which will trigger the execution of arbitrary code when the user presses the F1 key. The F1 key launches winhlp32.exe within an attacker supplied .hlp file. Successful exploitation of this issue may allow the attacker to take complete control of the affected system.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75 / R71 / R70 / R65

In the IPS tab, click Protections and find the Microsoft VBScript MsgBox Call with Malicious HLP File protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Web Client Enforcement Violation.
Attack Information: Microsoft VBScript MsgBox Call with Malicious HLP File