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             AUSCERT External Security Bulletin Redistribution

                          ESB-2007.1052 -- [Win]
     IBM Lotus Domino Web Access ActiveX control stack buffer overflow
                             28 December 2007

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              IBM Lotus Domino Web Access
Publisher:            US-CERT
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-4474

Original Bulletin:    http://www.kb.cert.org/vuls/id/963889

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Vulnerability Note VU#963889

IBM Lotus Domino Web Access ActiveX control stack buffer overflow

Overview

   The IBM Lotus Domino Web Access ActiveX control contains multiple
   stack buffer overflow vulnerabilities, which may allow a remote,
   unauthenticated attacker to execute arbitrary code on a vulnerable
   system.

I. Description

   IBM Lotus Domino includes an ActiveX control called Domino Web Access,
   which is used for uploading files and clearing the cache on logout.
   The Domino Web Access is provided by the files inotes6.dll and
   inotes6w.dll for Domino 6.x, and dwa7.dll or dwa7W.dll for Domino 7.x.
   The Domino Web Access ActiveX control contains multiple stack buffer
   overflows.

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

   We are currently unaware of a practical solution to this problem.
   Please consider the following workarounds

   Disable the Domino Web Access ActiveX controls in Internet Explorer
   The vulnerable ActiveX controls can be disabled in Internet Explorer
   by setting the kill bit for the following CLSIDs:
       {3BFFE033-BF43-11d5-A271-00A024A51325}
       {E008A543-CEFB-4559-912F-C27C2B89F13B}

   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
   these controls:
   Windows Registry Editor Version 5.00
       [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX
       Compatibility\{3BFFE033-BF43-11d5-A271-00A024A51325}]
       "Compatibility Flags"=dword:00000400
       [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX
       Compatibility\{E008A543-CEFB-4559-912F-C27C2B89F13B}]
       "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
   IBM Corporation Vulnerable 21-Dec-2007
   Lotus Software  Vulnerable 21-Dec-2007

References

   http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer
   http://lists.grok.org.uk/pipermail/full-disclosure/2007-December/059233.html
   http://secunia.com/advisories/28184/
   http://support.microsoft.com/kb/240797

Credit

   This vulnerability was reported by Will Dormann of the CERT/CC. It was
   also independently discovered and publicly disclosed by Elazar Broad.

   This document was written by Will Dormann.

Other Information

            Date Public 12/20/2007
   Date First Published 12/21/2007 10:07:31 AM
      Date Last Updated 12/21/2007
          CERT Advisory
               CVE Name CVE-2007-4474
                 Metric 27.34
      Document Revision 8


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