US-CERT Technical Cyber Security Alert TA09-209A -- Microsoft Windows, Internet Explorer, and Active Template Library (ATL) Vulnerabilities

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National Cyber Alert System

Technical Cyber Security Alert TA09-209A

Microsoft Windows, Internet Explorer, and Active Template Library (ATL) Vulnerabilities

Original release date: July 28, 2009
Last revised: --
Source: US-CERT

Systems Affected

* Microsoft Windows and Windows Server
* Microsoft Internet Explorer
* Microsoft Visual Studio and C++ Redistributable Package
* ActiveX controls from multiple vendors


Microsoft has released out-of-band updates to address critical
vulnerabilities in Microsoft Internet Explorer running on most
supported versions of Windows. The updates also help mitigate
attacks against ActiveX controls developed with vulnerable versions
of the Microsoft Active Template Library (ATL).

I. Description

Microsoft has released updates for critical vulnerabilities in
Internet Explorer. The updates also include mitigations for attacks
against vulnerable ActiveX controls that were created using
vulnerable versions of the Active Template Library (ATL).

Vulnerabilities present in the ATL can cause vulnerabilities in the
resulting ActiveX controls and COM components. For example, the ATL
typographical error described in this Security Development
Lifecycle blog post caused the Microsoft Video ActiveX control
stack buffer overflow (VU#180513, CVE-2008-0015).

Any ActiveX control or COM component that was created with a
vulnerable version of the ATL may be vulnerable. For example, Adobe
and Cisco are affected.

II. Impact

By convincing a user to view a specially crafted HTML document
(e.g., a Web page, HTML email message, or HTML attachment), an
attacker may be able to execute arbitrary code.

III. Solution

System Administrators

To address the vulnerabilities in Internet Explorer and mitigate
attacks against vulnerable ATL-based ActiveX controls, apply the
updates described in Microsoft Security Bulletin MS09-034. Further
details about the ATL mitigations are available in a Microsoft
Security Research & Defense blog post.

Administrators should consider using an automated update
distribution system such as Windows Server Update Services (WSUS).


To stop creating vulnerable controls, update the ATL as described
in Microsoft Security Bulletin MS09-035. To address vulnerabilities
in existing controls, recompile the controls using the updated ATL.
Further discussion about the ATL vulnerabilities can be found in
the Security Development Lifecycle blog.

IV. References

* Vulnerability Note VU#456745 -

* Vulnerability Note VU#180513 -

* Vulnerabilities in Microsoft Active Template Library (ATL) Could
Allow Remote Code Execution -

* Microsoft Security Bulletin MS09-34 -

* Microsoft Security Bulletin MS09-35 -

* Protect Your Computer: Active Template Library, Security Updates -

* Microsoft Security Advisory 973882, Microsoft Security Bulletins
MS09-034 and MS09-035 Released -

* Black Hat USA Spotlight: ATL Killbit Bypass -

* ATL -

* ATL, MS09-035 and the SDL -

* Internet Explorer Mitigations for ATL Data Stream Vulnerabilities -

* Microsoft Windows Server Update Services -

* Impact of Microsoft ATL vulnerability on Adobe Products -

* Cisco Security Advisory: Active Template Library (ATL)
Vulnerability -

* CVE-2008-0015 -


The most recent version of this document can be found at:


Feedback can be directed to US-CERT Technical Staff. Please send
email to <cert@xxxxxxxx> with "TA09-209A Feedback VU#456745" in
the subject.

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Produced 2009 by US-CERT, a government organization.

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Revision History

July 28, 2009: Initial release

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