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, dwa7.dll or dwa7W.dll for Domino 7.x, and dwa8.dll or dwa8w.dll for Domino 8.x. The Domino Web Access ActiveX control contains multiple stack buffer overflows.

Exploit code for this vulnerability is publicly available.

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

Please see the IBM Advisory for details. This document indicates that Domino Web Access 8.0.1 and 7.0.4 will contain the fix, and also that a hot fix is available.

Until these updates are available, 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}
{983A9C21-8207-4B58-BBB8-0EBC3D7C5505}
{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_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{3BFFE033-BF43-11d5-A271-00A024A51325}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{983A9C21-8207-4B58-BBB8-0EBC3D7C5505}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX 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	4-Jan-2008
Lotus Software	Vulnerable	4-Jan-2008

References

http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer
http://www-1.ibm.com/support/docview.wss?rs=463&uid=swg21279071
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	01/08/2008
CERT Advisory
CVE Name	CVE-2007-4474
Metric	27.34
Document Revision	17