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Category:   Application (Instant Messaging/IRC/Chat)  >   IBM Sametime Vendors:   IBM
IBM Lotus Sametime Buffer Overflow in STJNILoader.ocx ActiveX Control Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1017828
SecurityTracker URL:
CVE Reference:   CVE-2007-1784   (Links to External Site)
Updated:  May 16 2008
Original Entry Date:  Mar 29 2007
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.1, 6.5.1, 7.0
Description:   A vulnerability was reported in Sametime. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create specially crafted HTML that, when loaded by the target user, will trigger a buffer overflow in JNILoader and execute arbitrary code on the target system. The code will run with the privileges of the target user.

The vulnerable STJNILoader.ocx ActiveX control has the following class identifiers:


The vendor was notified on August 1, 2006.

Andrew Christensen of FortConsult ApS reported this vulnerability to iDefense.

Impact:   A remote user can create HTML that, when loaded by the target user, will execute arbitrary code on the target user's system.
Solution:   The vendor has issued a fix for Sametime 7.0.

The vulnerable JNILoader ActiveX control is no longer used in Sametime 7.5.

The IBM advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  iDefense Security Advisory 03.29.07: IBM Lotus Sametime JNILoader

IBM Lotus Sametime JNILoader Arbitrary DLL Load Vulnerability

iDefense Security Advisory 03.29.07
Mar 29, 2007


IBM Corp.'s Lotus Sametime product provides a real-time online conferencing
solution. More information on the product can be found on IBM Corp.'s
at the following URL.


Remote exploitation of a input validation vulnerability in IBM Corp.'s Lotus
Sametime allows attackers to execute arbitrary code in the context of the
user viewing a malicious web page.

The problem specifically exists in the STJNILoader.ocx component of IBM
Corp.'s Lotus Sametime product. This ActiveX control is safe for scripting
and exports a LoadLibrary function that does not properly sanitize input.

This control uses the following class identifiers:
{7261EE42-318E-490A-AE8F-77649DBA1ECA} and


Exploitation allows attackers to execute arbitrary code in the context
of the
user viewing a malicious web page.

Varying levels of social engineering are required for successful
The attacker must get a malicious library onto the victims site as well
as get
them to visit a malicious web site.

Any local file name or valid UNC path can be used as a library to be loaded.
The file extension does not have any affect on whether or not this control
will load the specified library.


iDefense has confirmed that this vulnerability is present in IBM Corp.'s
Sametime STJNILoader.ocx version

It is important to note that the Lotus Sametime product does not have to be
installed for a system to be vulnerable. Only the STJNILoader.ocx must be
installed. If it is not installed, the user will be prompted to install
it at
the time of exploitation.


Exploitation can easily be mitigated by disabling active content support
within the browser. Take note that employing this workaround could adversely
affect websites that rely upon the execution of browser-based script code.

Setting the kill-bit for the previously mentioned CLSIDs will prevent this
control from loading within Internet Explorer. Mozilla Firefox does not
contain ActiveX support in it's default configuration.


The IBM Lotus Sametime team has addressed this issue by removing the
ActiveX control from the current version of their product. Additionally they
have provided hotfixes for older versions. More information is available
IBM Technote swg21257029 which can be found at the following URL.


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


08/01/2006  Initial vendor notification
08/01/2006  Initial vendor response
03/29/2007  Coordinated public disclosure


This vulnerability was reported to iDefense by Andrew Christensen of
FortConsult ApS.

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Permission is granted for the redistribution of this alert electronically.
It may not be edited in any way without the express written consent of
iDefense. If you wish to reprint the whole or any part of this alert in
any other medium other than electronically, please e-mail for permission.

Disclaimer: The information in the advisory is believed to be accurate at
the time of publishing based on currently available information. Use of
the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on, this


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