Re: [Full-disclosure] ZDI-12-012 : (0Day) McAfee SaaS myCIOScn.dll ShowReport Method Remote Command Execution

[Emanuel Rietveld <codehotter@xxxxxxxxx>]

I might be missing something, but if exploitation of this vulnerability 
requires the ability to instantiate the activeX control and calling a 
method, how is this a vulnerability?

If the user allows arbitrary activeX controls to instantiate and allows 
scripting access, one could simply instantiate WScript.Shell and call 
WScript.Shell.Exec(). The control MyCioScan.Scan is not marked safe by 
default on my system, and attempting to instantiate it gives exactly the 
same security prompts as trying to instantiate WScript.Shell.

On 01/12/2012 07:58 PM, ZDI Disclosures wrote:
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> ZDI-12-012 : (0Day) McAfee SaaS myCIOScn.dll ShowReport Method Remote
> Command Execution
> http://www.zerodayinitiative.com/advisories/ZDI-12-012
> January 12, 2012
>
> - -- CVE ID:
>
>
> - -- CVSS:
> 9, AV:N/AC:L/Au:N/C:P/I:P/A:C
>
> - -- Affected Vendors:
>
> McAfee
>
>
>
> - -- Affected Products:
>
> McAfee   Security-as-a-Service
>
>
>
> - -- TippingPoint(TM) IPS Customer Protection:
> TippingPoint IPS customers have been protected against this
> vulnerability by Digital Vaccine protection filter ID 11710.
> For further product information on the TippingPoint IPS, visit:
>
>      http://www.tippingpoint.com
>
> - -- Vulnerability Details:
> This vulnerability allows remote attackers to execute arbitrary code on
> vulnerable installations of McAfee Security-as-a-Service. User
> interaction is required to exploit this vulnerability in that the target
> must visit a malicious page or open a malicious file.
>
> The specific flaws exists within myCIOScn.dll.
> MyCioScan.Scan.ShowReport() will accept commands that are passed to a
> function that simply executes them without authentication. This can be
> leveraged by a malicious attacker to execute arbitrary code within the
> context of the browser.
>
> - -- Vendor Response:
>
>
>
> - -- Mitigation:
> The killbit can be set on this control to disable scripting within
> Internet Explorer by modifying the data value of the Compatibilty Flags
> DWORD within the following location in the registry:
>
> HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX
> Compatibility\209EBDEE-065C-11D4-A6B8-00C04F0D38B7
>
> If the Compatibility Flags value is set to 0x00000400 the control can no
> longer be instantiated inside the browser. For more information, please
> see: http://support.microsoft.com/kb/240797
>
>
> - -- Disclosure Timeline:
> 2011-04-01 - Vulnerability reported to vendor
>
> 2012-01-12 - 0Day advisory released in accordance with the ZDI 180 day
> deadline policy
>
>
>
> - -- Credit:
> This vulnerability was discovered by:
>
> * Andrea Micalizzi aka rgod
>
>
>
> - -- About the Zero Day Initiative (ZDI):
> Established by TippingPoint, The Zero Day Initiative (ZDI) represents
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> disclosing discovered vulnerabilities.
>
> Researchers interested in getting paid for their security research
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>
>      http://www.zerodayinitiative.com
>
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>
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>
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