Vulnerability Note VU#979638

Intuit QuickBooks Online Edition ActiveX control fails to properly restrict access to methods

Overview

The Intuit QuickBooks Online Edition ActiveX control fails to properly restrict access to dangerous methods, which could allow a remote attacker to execute arbitrary code on a vulnerable system.

I. Description

Intuit QuickBooks Online Edition is a version of QuickBooks that is implemented as an ActiveX control. This ActiveX control contains several dangerous methods, such as httpGETToFile() and httpPOSTFromFile(). These methods can be used to download or upload files in arbitrary locations.

II. Impact

By convincing a victim to view an HTML document (web page, HTML email, or email attachment), an attacker could download arbitrary files to a vulnerable system within the security context of the user running IE. These files could contain code that could be executed through other means. The user may click the file inadvertently, or the file may be placed in a sensitive location, such as the Windows Startup folder where it will automatically execute the next time the user logs onto the system. An attacker can also retrieve arbitrary files from a victim's computer.

III. Solution

Apply an update

This issue is addressed in version 10 of the QuickBooks Online Edition ActiveX control. The fixed version of the QuickBooks Online Edition ActiveX control can be installed from the QuickBooks Online Edition web site.

Disable the QuickBooks Online Edition ActiveX control in Internet Explorer

The vulnerable QuickBooks Online Edition ActiveX controls (versions 9 and earlier) can be disabled in Internet Explorer by setting the kill bit for the following CLSIDs:

{CF9DEB90-8DE3-11D5-BAE4-00105AAAFF94}
{4F720B9C-24B1-4948-A035-8853DC01F19E}
{2EFF8C97-F2A8-4395-9F47-9A06F998BF88}
{2CC3D8DE-18BF-43ff-8CB8-21B442300FD5}
{DBB177CC-6908-4b53-9BEE-F1C697818D65}
{A80D199B-CFDD-4da4-8C47-2310D5B8DD97}
{0D3983A9-4E29-4f33-8313-DA22B29D3F87}
{D92D7607-05D9-4dd8-B68B-D458948FB883}
{8CE3BAE6-AB66-40b6-9019-41E5282FF1E2}
{40F8967E-34A6-474a-837A-CEC1E7DAC54C}

More information about how to set the kill bit is available in Microsoft Support Document 240797. Alternatively, the following text can be saved as a .REG file and imported to set the kill bit for this control:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX
Compatibility{CF9DEB90-8DE3-11D5-BAE4-00105AAAFF94}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX
Compatibility{4F720B9C-24B1-4948-A035-8853DC01F19E}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX
Compatibility{2EFF8C97-F2A8-4395-9F47-9A06F998BF88}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX
Compatibility{2CC3D8DE-18BF-43ff-8CB8-21B442300FD5}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX
Compatibility{DBB177CC-6908-4b53-9BEE-F1C697818D65}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX
Compatibility{A80D199B-CFDD-4da4-8C47-2310D5B8DD97}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX
Compatibility{0D3983A9-4E29-4f33-8313-DA22B29D3F87}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX
Compatibility{D92D7607-05D9-4dd8-B68B-D458948FB883}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX
Compatibility{8CE3BAE6-AB66-40b6-9019-41E5282FF1E2}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX
Compatibility{40F8967E-34A6-474a-837A-CEC1E7DAC54C}]
"Compatibility Flags"=dword:00000400

Disable ActiveX

Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this and other ActiveX vulnerabilities. Instructions for disabling ActiveX in the Internet Zone can be found in the "Securing Your Web Browser" document.

Systems Affected

Vendor	Status	Date Updated
Intuit, Inc.	Vulnerable	4-Sep-2007

References

http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer
http://oe.quickbooks.com/
http://support.microsoft.com/kb/q196061

Credit

This vulnerability was reported by Will Dormann of the CERT/CC.

This document was written by Will Dormann.

Other Information

Date Public	09/04/2007
Date First Published	09/04/2007 11:00:48 PM
Date Last Updated	09/04/2007
CERT Advisory
CVE Name	CVE-2007-4471
Metric	1.96
Document Revision	12