Re: [Full-disclosure] Macrovision FlexNet Connect DownloadManager Insecure Methods

["Elazar Broad" <elazar@xxxxxxxxxxxx>]

Forget downloading files to the startup directory, it looks like 
Macrovision still hasn't fixed the DownloadAndExecute() method of 
isusweb.dll. I believe that this issue is similar to this one: 
http://www.securityfocus.com/bid/26280(maybe someone from iDefense 
could confirm that?), just that this is a different classid and a 
newer version of isusweb(different framework too?).

isusweb.dll version 6.1.100.61372,Macrovision FLEXnet Connect Web 
Agent
Digitally signed March 29th, 2007
{1DF951B1-8D40-4894-A04C-66AD824A0EEF}
MVSNClientWebAgent61.WebAgent 


Exploit code is(will be) on Milw0rm, exploiting this is pretty self 
explanatory though...

Elazar

On Mon, 14 Jan 2008 19:51:22 +0000 Elazar Broad 
<elazar@xxxxxxxxxxxx> wrote:
>Who:
>Macrovision
>
>What:
>Macrovision FlexNext Connect is a software package that allows 
>ISV's to update their software products. It is generally used in 
>conjunction with the InstallShield software deploymnet framework.
>
>FlexNet uses a number of ActiveX controls, some of which are 
>marked 
>safe for scripting, in this case, the DownloadManager object:
>
>ISDM.exe version 6.1.100.61372
>MVSNClientDownloadManager61Lib.DownloadManager
>{FCED4482-7CCB-4E6F-86C9-DCB22B52843C}
> IObjectSafety:
> IO. Safe for scripting (IDispatch)
>
>How:
>This control contains several methods which can be used to 
>silently 
>download arbitrary files to the system and possibly overwrite 
>files 
>in the context of the user.
>
>Workaround:
>Set the killbit for this control and the Basket control(see 
>Notes), 
>see http://support.microsoft.com/kb/240797
>
>Fix:
>None
>
>Exploit;
>http://milw0rm.com/exploits/4909
>
>Notes:
>The Basket object {1DF951B1-8D40-4894-A04C-66AD824A0EEF} of 
>isusweb.dll can be used in a similar manner to download and 
>execute 
>files on a system via the ISDM scheduling framework, however, it 
>does so visibly.
>
>I understand that some of this functionality is by design, 
>however, 
>there should be some validation in place to verify that the files 
>that are being downloaded are indeed from a trusted source and are 
>
>
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>updates to packages that are actually installed on the system.    
>
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