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02 April 2008

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             AUSCERT External Security Bulletin Redistribution

                          ESB-2008.0335 -- [Win]
         Macrovision InstallShield InstallScript One-Click Install
                  Untrusted Library Loading Vulnerability
                               2 April 2008


        AusCERT Security Bulletin Summary

Product:              Macrovision InstallShield InstallScript
                        One-Click Install ActiveX Control
Publisher:            iDefense
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-5661

Original Bulletin:

- --------------------------BEGIN INCLUDED TEXT--------------------

iDefense Security Advisory 03.31.08
Mar 31, 2008


Macrovision InstallShield InstallScript One-Click Install (OCI) is a web
based installer technology that allows software publishers to distribute
minimal installer packages which allow end users to select components to
install. Upon first visiting such a website, the user is prompted to
install the ActiveX control. More information can be found on the
vendor's site at the following URL.



Remote exploitation of an untrusted library loading vulnerability in
Macrovision's InstallShield InstallScript One-Click Install ActiveX
control allows remote attackers to execute code with the privileges of
the currently logged in user.

InstallShield InstallScript "One-Click Install" is implemented in an
ActiveX control with the following properties:

  File: %WINDIR%\Downloaded Program Files\setup.exe
  CLSID: 53D40FAA-4E21-459f-AA87-E4D97FC3245A

This control is marked "safe for scripting".

When a user visits a website from which a web install can be performed,
the ActiveX control downloads and loads several DLL files from the
remote website. Since no sanity checks are performed on the DLL files,
an attacker can substitute specially crafted libraries that will
execute arbitrary code when loaded.


Exploitation allows attackers to execute arbitrary code with the
privileges of the currently logged-in user. In order for exploitation
to occur, users would be required to have a vulnerable version of the
ActiveX control installed and be lured to a malicious site.


iDefense confirmed this vulnerability exists in version 12.0 of the
Macrovision InstallShield InstallScript One-Click Install ActiveX
Control. Previous versions of the control are reported to be vulnerable
to variations of this attack. Previous versions are known to use
different CLSIDs.


Administrators can set the kill-bit for the vulnerable ActiveX control
with the following .reg file. This will prevent the control from
loading within Internet Explorer.

  Windows Registry Editor Version 5.00
  [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX
  "Compatibility Flags"=dword:00000400


Macrovision has addressed this vulnerability by releasing a hotfix for
the following products.

  FLEXnet InstallShield 12 Professional (with InstallShield 12 SP2)
  FLEXnet InstallShield 12 Premier (with InstallShield 12 SP2)

For more information, consult their Knowledge Base article at the
following URL.



The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-5661 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.


01/08/2007  Initial vendor notification
04/17/2007  Second vendor notification
04/18/2007  Initial vendor response
03/31/2008  Coordinated public disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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Copyright © 2008 iDefense, Inc.

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 There are no warranties with regard to this information. Neither the
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- --------------------------END INCLUDED TEXT--------------------

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