Vulnerability Note VU#985449

SAP AG SAPgui EAI WebViewer3D ActiveX control stack buffer overflow

Overview

The Siemens Unigraphics Solutions Teamcenter Visualization EAI WebViewer3D ActiveX control, which comes with SAPgui, contains a stack buffer overflow. This may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

I. Description

SAP AG SAPgui includes an ActiveX control called EAI WebViewer3D, which is produced by Unigraphics Solutions, a division of Siemens. The EAI WebViewer3D ActiveX control, which is provided by webviewer3d.dll, contains a stack buffer overflow in the SaveViewToSessionFile() method. Although the ActiveX control is produced by Siemens, it is reported to only be used by SAP.

II. Impact

By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary code with the privileges of the user. The attacker could also cause the web browser to crash.

III. Solution

Apply an update

This issue is addressed with SAPgui 7.10 Patch Level 9. This update sets the kill bit for the vulnerable control, since it was not intended for use in Internet Explorer. Although the SAPgui 7.10 Patch Level 8 release notes indicate that the control is disabled via the kill bit, please note that the kill bit was not properly set until Patch Level 9. Please also consider the following workarounds:

Disable the EAI WebViewer3D ActiveX control in Internet Explorer

The vulnerable ActiveX control can be disabled in Internet Explorer by setting the kill bit for the following CLSID:

{AFBBE070-7340-11d2-AA6B-00E02924C34E}

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{AFBBE070-7340-11d2-AA6B-00E02924C34E}]
"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 Notified	Date Updated
SAP	Vulnerable	2008-07-21	2009-03-31
Siemens CERT	Vulnerable	2007-07-07	2009-02-16
Unigraphics Solutions	Vulnerable	2007-10-29	2009-02-16

References

http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer
https://service.sap.com/sap/support/notes/1153794
http://support.microsoft.com/kb/240797

Credit

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

This document was written by Will Dormann.

Other Information

Date Public:	2009-03-31
Date First Published:	2009-03-31
Date Last Updated:	2009-04-13
CERT Advisory:
CVE-ID(s):	CVE-2007-4475
NVD-ID(s):	CVE-2007-4475
US-CERT Technical Alerts:
Metric:	10.48
Document Revision:	18