full-disclosure - Re: DLL hijacking with Autorun on a USB drive

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Date: Tue, 14 Sep 2010 18:54:27 -0400
From: Dan Kaminsky <dan@...para.com>
To: Stefan Kanthak <stefan.kanthak@...go.de>
Cc: Valdis.Kletnieks@...edu, full-disclosure@...ts.grok.org.uk
Subject: Re: DLL hijacking with Autorun on a USB drive

On Tue, Sep 14, 2010 at 6:07 PM, Stefan Kanthak <stefan.kanthak@...go.de> wrote:
> Dan Kaminsky wrote:
>
>> h0h0h0.  There be history, Larry.
>>
>> Short version:  Go see how many DLLs exist outside of c:\windows\system32.
>> Look, ye mighty, and despair when you realize all those apps would be broken
>> by CWD DLL blocking.
>
> No, that's the too much shortened version.
> The correct version but is: Go see how many DLLs exist outside of the DLL
> search path.
> CWD DLL blocking does NOT break all those apps!
> Apps which install their DLLs into their own application directory won't
> notice CWD blocking at all.
>
> And apps which break can be easily fixed:
>
> [HKLM\Software\Microsoft\Windows\CurrentVersion\App Paths\application.exe]
> "Path"=...
>
> exists for more than 15 years now.
>
> Stefan
>
>

An automatic patch that breaks random apps will not be an automatic
patch -- and neither will the twenty patches after it.

Nobody cares that the breakage "can be fixed" with some fifteen year old key.

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