Update Protection against Microsoft VBScript MsgBox Call with Malicious HLP File Vulnerability (MS10-022)

Vulnerability
Protection

Check Point Reference:	CPAI-2010-049
Date Published:
Severity:
Last Updated:
Source:	Microsoft Security Advisory (981169) Microsoft Security Bulletin MS10-022
Industry Reference(s):	CVE-2010-0483
Protection Provided by:	Security Gateway R70 VPN-1 NGX R65 VSX NGX R65 IPS-1 IPS-1 IPS-1 NGX R65
Who is Vulnerable? Microsoft Windows 2000 SP4 Windows XP SP2 Windows XP SP3 Windows XP Professional x64 Edition SP2 Windows Server 2003 SP2 Windows Server 2003 with SP2 (Itanium) Windows Server 2003 x64 Edition SP2
Vulnerability Description A remote code execution vulnerability has been discovered in the way that VBScript interacts with Windows Help files when using Internet Explorer. A remote attacker can exploit this vulnerability by convincing a user to visit a specially crafted Web page. Successful exploitation could result in execution of arbitrary code on the affected system.

Vulnerability Status This vulnerability was publicly disclosed at http://isec.pl/poc-isec27/
Update/Patch Available Apply patches: Microsoft Security Bulletin MS10-022
Vulnerability Details 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/VPN-1 product to the latest IPS/SmartDefense update. For information on how to update IPS/SmartDefense, go to SBP-2006-05, Protection tab and select the version of your choice.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway R70

How Can I Protect My Network?
1. In the IPS tab, click Protections > By Protocol > Web Intelligence > HTTP Client Protections > Microsoft Internet Explorer Vulnerabilities.
2. In the right pane, double-click the Microsoft VBScript MsgBox Call with Malicious HLP File protection.
3. In the Protection Details window, click on Edit. Choose the protection's Action (Override IPS Policy with: Prevent/Detect), and apply Additional Settings.
4. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name: Web Client Enforcement Violation
Attack Information: Microsoft VBScript MsgBox call with malicious HLP file

VPN-1 NGX R65 & VPN-1 VSX NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Web Intelligence > HTTP Client Protections > Microsoft Internet Explorer Vulnerabilities > Microsoft VBScript MsgBox Call with Malicious HLP File.
2. In the configuration pane, under Settings > Mode, check Active.
3. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name: Web Client Enforcement Violation
Attack Information: Microsoft VBScript MsgBox call with malicious HLP file

IPS-1 & IPS-1 NGX R65

How Can I Protect My Network?
1. In the IPS-1 Policy Manager, click on the Protection tab.
2. In the Protection tree, click Web Intelligence > HTML, and select the Internet Explorer protection group.
3. Click Microsoft VBScript MsgBox Call with Malicious HLP File Attack (IPS-1 NGX R65 only).
4. In the configuration pane, under Settings, check Active.
5. Click on Install Policy.

How Do I Know if My Network is Under Attack?
Upon attack, the following entry will be logged:

Alert Name: Internet Explorer Vulnerabilities
Description: Microsoft VBScript MsgBox Call with Malicious HLP File Attack

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