full-disclosure - [ok] RE: Unchecked buffer in mstask.dll

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From: purdy at tecman.com (Curt Purdy)
Subject: [ok] RE: Unchecked buffer in mstask.dll

Dmitry Yu wrote:
> > Being curious, on Win2k, I copied cmd.exe (from
> winnt\system32) as xyz.pif;
> > then (right-click) Properties, Program crashes explorer. Is
> this related to
> > IconHandler, and is it exploitable?
>
> 	Disassembly window shows that there was an attempt to read dword
> at [EAX] (EAX=0).  So at first glance this doesn't seem to be
> trivially
> exploitable, but I'm not a win32 expert, and intuition
> suggests that there
> must be a way.

One possible exploit is to simply place the file on your desktop.
explorer.exe goes to 100% cpu.

Curt Purdy CISSP, GSEC, MCSE+I, CNE, CCDA
Information Security Engineer
DP Solutions

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