Public Vulnerability Reports

IBM Lotus Sametime JNILoader Arbitrary DLL Load Vulnerability

03.29.07

BACKGROUND

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 website at the following URL.

http://ibm.com/software/info/lotus/sametime/

DESCRIPTION

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 {0B9C9C7D-ED81-4594-AFCB-FC5588125382}

ANALYSIS

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 exploitation. 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.

DETECTION

iDefense has confirmed that this vulnerability is present in IBM Corp.'s Lotus Sametime STJNILoader.ocx version 3.1.0.26.

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.

WORKAROUND

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.

VENDOR RESPONSE

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

http://www-1.ibm.com/support/docview.wss?uid=swg21257029

CVE INFORMATION

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

DISCLOSURE TIMELINE

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

CREDIT

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

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LEGAL NOTICES

Copyright © 2007 Verisign, Inc.

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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 information.