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IBM Lotus Domino Web Access ActiveX Stack Buffer Overflow Vulnerability

01.03.10

BACKGROUND

IBM Lotus Domino includes an ActiveX control called Domino Web Access, which provides Web-based access for Lotus Notes users. The control features functionality that is used for uploading files and clearing the cache upon logout. For more information, see the vendor's site found at the following link.

http://www-01.ibm.com/software/lotus/products/inotes/

DESCRIPTION

Remote exploitation of a stack-based buffer overflow vulnerability in IBM Corp.'s Lotus Domino Web Access ActiveX control could allow an attacker to execute arbitrary code with the privileges of the current user.

The vulnerabe function takes an attacker-controlled URL, and copies it into a fixed-size stack buffer. No validation checks are performed on the length of the URL. By passing in a long URL string, it is possible to trigger a stack-based buffer overflow, resulting in the execution of arbitrary code.

ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the user viewing the Web page. To exploit this vulnerability, a targeted user must load a malicious Web page created by an attacker. An attacker typically accomplishes this via social engineering or injecting content into compromised, trusted sites. After the user visits the malicious Web page, no further user interaction is needed.

The vulnerability is a stack-based buffer overflow, and there are no compiler/runtime protections such as stack cookies or safe exception handling in the module. As such, reliable exploitation is trivial.

DETECTION

iDefense has confirmed the existence of this vulnerability in Lotus Domino Web Access version 8.0.2. Previous versions may also be affected. The libraries that contain the vulnerable code are dwa8.dll and dwa8w.dll. IBM states that Lotus Domino Web Access versions 6.5, 7.0 and 8.0 are affected.

WORKAROUND

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}

VENDOR RESPONSE

IBM has released a solution which addresses this issue. Information about downloadable vendor updates can be found by clicking on the URLs shown.

http://www-01.ibm.com/support/docview.wss?rs=463&uid=swg21421808

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

DISCLOSURE TIMELINE

09/18/2008 Initial Vendor Notification
09/24/2008 Initial Vendor Reply
03/02/2010 Coordinated Public Disclosure

CREDIT

This vulnerability was reported to iDefense by Elazar Broad.

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