full-disclosure - Re: ChemViewX ActiveX Control Mutliple Stack Overflows

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Date: Fri, 12 Feb 2010 10:49:40 -0400
From: Rosa Maria Gonzalez Pereira <analuis13@...mail.com>
To: <paul.craig@...urity-assessment.com>, <full-disclosure@...ts.grok.org.uk>
Subject: Re: ChemViewX ActiveX Control Mutliple Stack
 Overflows





Porque hablan tanto de vulnerabilidad y no entiendo como es que su informacion llega tan fácil a mi buzon de correo

___________________________________________




> From: paul.craig@...urity-assessment.com
> To: full-disclosure@...ts.grok.org.uk
> Date: Fri, 12 Feb 2010 13:25:51 +1300
> Subject: [Full-disclosure] ChemViewX ActiveX Control Mutliple Stack Overflows
> 
> 
>      (    , )     (,
>   .   `.' ) ('.    ',
>    ). , ('.   ( ) (
>   (_,) .`), ) _ _,
>  /  _____/  / _  \    ____  ____   _____  
>  \____  \==/ /_\  \ _/ ___\/  _ \ /     \
>  /       \/   |    \\  \__(  <_> )  Y Y  \
> /______  /\___|__  / \___  >____/|__|_|  /
>         \/         \/.-.    \/         \/:wq
>                     (x.0)
>                   '=.|w|.='
>                   _='`"``=.
> 
>         presents..
> 
> ChemviewX ActiveX Control Multiple Stack Overflows
> Versions affected: v1.9.5
> 
> +-----------+
> |Description|
> +-----------+
> 
> Hyleos ChemviewX is a free ActiveX control used to visualize chemical
> structures made from MDL or MOL files. The control is commonly used by
> university students, organic and inorganic chemists, and chemical engineers.
> 
> The ClassID of the object is {C372350A-1D5A-44DC-A759-767FC553D96C} and 
> the control is marked safe for scripting.
> Two stack overflows were discovered in the ActiveX control, both
> overflow conditions can be used to gain command execution.
>     
> +------------+
> |Exploitation|
> +------------+
> 
> Both stack overflow conditions relate to a fixed length buffer being used to
> remove excessive whitespace characters from supplied file paths.
> 
> The methods SaveasMolFile and ReadMolFile are both vulnerable to
> a stack overflow condition which can be reached when supplying
> more than 400 white-space characters in the filename argument.
> 
> Both tab and space characters can be used to trigger the overflow condition.
> The 401-404th byte will result in the overflow of the call stack return address.
> Both vulnerabilities can be used to gain command execution when combined
> with a JavaScript heap spray when jumping into a pre-allocated heap.
> 
> +--------+
> |Solution|
> +--------+
> 
> The vendor was contacted multiple times over a two month period without any response.
> Use of this control is not suggested as it appears to be unmaintained.
> If you use this ActiveX control consider setting the kill bit for the control’s
> Classid ({C372350A-1D5A-44DCA759-767FC553D96C}), or uninstalling the control.
> 
> +------+
> |Credit|
> +------+
> 
> Discovered and advised to Hyleos in December 2009 by Paul Craig - Security-Assessment.com
> This advisory is also available from our website:
> http://www.security-assessment.com/files/advisories/2010-02-11_ChemviewX_Activex.pdf
> 
> Security-Assessment.com is a New Zealand based world leader in web application testing, network security
> and penetration testing. Security-Assessment.com works with organisations across New Zealand, Australia,
> Asia Pacific, the United States and the United Kingdom.
> 
> 
> _______________________________________________
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Full-Disclosure - We believe in it.
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