Check Point Advisories

Microsoft Rich Textbox Control Arbitrary File Overwrite (CVE-2008-0237)

Vulnerability
Protection

Check Point Reference:	CPAI-2008-018
Date Published:	3 Feb 2008
Severity:	High
Last Updated:	Sunday 03 February, 2008
Source:
Industry Reference:	CVE-2008-0237
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description	Microsoft Rich Textbox is an ActiveX control that comes with Visual Basic. It allows programs to create formatted text in Rich Text Format. Microsoft Rich Textbox control (ActiveX control Richtx32.ocx) is used for displaying, entering, and manipulating text with formatting. It can also display fonts, colors, and links, and load text and embedded images from a file. A file overwriting vulnerability exists in Microsoft Rich Textbox control ActiveX control. This vulnerability is due to lack of verification in the Microsoft Rich Textbox Control ActiveX control when handling arguments sent to a certain method. To trigger this issue, an attacker may create a malicious web page that will exploit this flaw. Successful exploitation may allow creating or modifying arbitrary files on the vulnerable system.

Protection Overview

This protection will detect and block the vulnerable ActiveX Control.

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 Rich Textbox Control Arbitrary File Overwrite 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 Rich Textbox control arbitrary file overwrite