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A  U  S  C  E  R  T                                           A  L  E  R  T

                       AL-2008.0115 -- AUSCERT ALERT
                                   [Win]
    SAP AG SAPgui MDrmSap ActiveX control code execution vulnerability
                             13 November 2008

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        AusCERT Alert Summary
        ---------------------

Product:              SAP
Publisher:            US-CERT
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
                      Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-4387

Original Bulletin:    http://www.kb.cert.org/vuls/id/277313

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Vulnerability Note VU#277313

SAP AG SAPgui MDrmSap ActiveX control code execution vulnerability

Overview

The MDrmSap ActiveX control, which is provide with the SAP AG SAPgui software,
contains a vulnerability that can allow a remote, unauthenticated attacker 
to execute arbitrary code on a vulnerable system.

I. Description

SAPgui is a graphical user interface client for SAP software. One of the 
components provided by SAPgui is an ActiveX control called MDrmSap, which is 
provided by the file mdrmsap.dll. This ActiveX control was developed by 
Simba Technologies for use with the SAPgui product. The MDrmSap ActiveX 
control contains an unspecified flaw that causes Internet Explorer to crash 
in an exploitable manner when it attempts to instantiate the control.

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 Internet Explorer (or the program using the WebBrowser control) 
to crash.       

III. Solution

Apply an update

This vulnerability is addressed in the patch provided by SAP Note 
1142431 (login required).

Disable the MDrmSap ActiveX control in Internet Explorer

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

{B01952B0-AF66-11D1-B10D-0060086F6D97}

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_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{B01952B0-AF66-11D1-B10D-0060086F6D97}]
"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      2007-07-07      2008-11-10
Simba Technologies  Vulnerable      2007-12-12      2008-11-10

References

http://www.kb.cert.org/vuls/id/680526
http://service.sap.com/sap/support/notes/1142431
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:            2008-11-07
Date First Published:   2008-11-07
Date Last Updated:      2008-11-10
CERT Advisory:   
CVE-ID(s):              CVE-2008-4387
NVD-ID(s):              CVE-2008-4387
US-CERT Technical Alerts:        
Metric:                 10.94
Document Revision:      8

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