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Tom Sawyer GET Extension Factory COM Object Instantiation Memory Corruption Vulnerability



Tom Sawyer Software's GET Extension Factory is a component used for graph visualization applications development. It is included in VMWare Infrastructure Client. For more information, please visit vendor's website:


Remote exploitation of a memory corruption vulnerability in Tom Sawyer Software's GET Extension Factory could allow an attacker to execute arbitrary code with the privileges of the affected user.

The vulnerability exists within the way that Internet Explorer instantiates GET Extension Factory COM objects, which is not intended to be created inside of the browser. The object does not initialize properly, and this leads to a memory corruption vulnerability that an attacker can exploit to execute arbitrary code.


Exploitation of this vulnerability would allow an attacker to execute arbitrary code with the privileges of the affected user. In order to exploit this vulnerability, an attacker would have to convince the target to visit a website. An attacker typically accomplishes this via social engineering or injecting content into compromised, trusted sites.


iDefense has confirmed Tom Sawyer's Default GET Extension Factory, tsgetxu71ex552.dll and tsgetx71ex552.dll to be vulnerable. VMWare VI Client bundled with VMware Infrastructure 3: VI Clients prior to 2.0.2 build 230598 and VI Clients prior to 2.5 build 204931; vSphere Client versions are not vulnerable.


Setting the kill bit for those controls will prevent exploitation. The CLSIDs for the controls are A2282403-50DE-4A2E-A118-B90AEDB1ADCC and 575B655F-FED4-4EE1-8F62-0A69D404F46B


VMware Inc. has released patches to address this issue. Information about downloadable vendor updates can be found by clicking on the URLs shown.


The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2011-2217 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


11/11/2008 Initial Vendor Notification
11/11/2008 Initial Vendor Reply
06/03/2011 Coordinated Public Disclosure


This vulnerability was reported to iDefense by Elazar Broad.

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