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CERT Coordination Center

BusinessObjects RptViewerAX ActiveX control stack buffer overflow

Vulnerability Note VU#329673

Original Release Date: 2008-03-18 | Last Revised: 2008-04-28

Overview

The BusinessObjects RptViewerAX ActiveX control contains a stack buffer overflow, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

Description

BusinessObjects 6.5 includes an ActiveX control called RptViewerAX, which is provided by RptViewerAX.dll. This ActiveX control is marked as Safe for Scripting and Safe for Initialization, which means that they can be controlled by a web page in Internet Explorer. The RptViewerAX ActiveX control is vulnerable to stack buffer overflow.

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.

Solution

Apply an update

According to the vendor:
This issue has been fixed in critical hot fix CHF74 for the affected software. Users are asked contact support if they are not on or above CFH74 for Business Objects 6.5. Users with valid subscriptions can login to the web site:

http://support.businessobjects.com/downloads/service_packs/default.asp
Select BusinessObjects 6.5.x a valid login is required.

Note that the vulnerable ActiveX control can be installed by using a BusinessObjects web server with Internet Explorer. Users that have obtained the RptViewerAX control in this way may wish to consider the following workarounds:


Disable the RptViewerAX ActiveX control in Internet Explorer

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

    {B20D9D6A-0DEC-4d76-9BEF-175896006B4A}
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\{B20D9D6A-0DEC-4d76-9BEF-175896006B4A}]
    "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. 

Vendor Information

329673
 
Affected   Unknown   Unaffected

Business Objects

Notified:  May 09, 2007 Updated:  March 18, 2008

Status

  Vulnerable

Vendor Statement

This issue has been fixed in critical hot fix CHF74 for the affected software. Users are asked contact support if they are not on or above CFH74 for Business Objects 6.5. Users with valid subscriptions can login to the web site:

http://support.businessobjects.com/downloads/service_packs/default.asp
Select BusinessObjects 6.5.x a valid login is required.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Please disable the vulnerable ActiveX control if you cannot install an updated version.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A

References

Acknowledgements

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

This document was written by Will Dormann.

Other Information

CVE IDs: CVE-2007-6254
Severity Metric: 4.56
Date Public: 2008-03-18
Date First Published: 2008-03-18
Date Last Updated: 2008-04-28 20:25 UTC
Document Revision: 10

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