bugtraq - Re: Netsprint Toolbar 1.1 arbitrary remote code vulnerability

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Message-ID: <Pine.LNX.4.58.0704171727210.7576@dione>
Date: Tue, 17 Apr 2007 17:32:28 +0200 (CEST)
From: Michal Zalewski <lcamtuf@...ne.ids.pl>
To: Michal Bucko <michal.bucko@...k.pl>
Cc: bugtraq@...urityfocus.com
Subject: Re: Netsprint Toolbar 1.1 arbitrary remote code vulnerability

On Tue, 17 Apr 2007, Michal Bucko wrote:

> Function of a prototype isChecked (char*) (in toolbar.dll) is vulnerable
> to buffer overrun. Arbitrary code execution might be possible.The
> problem occurs when
>
> 767B49 MOV ECX,[EAX+140]
>
> data is being copied into the buffer of an insufficient size.

Your advisory contains virtually no technical information that could be
used to confirm the problem - but assuming Intel notation, the above MOV
seems to be inconsistent with the description given.

This operations loads dword from memory into a register; if this is where
the application crashes, it's more likely indicative of a NULL pointer bug
(if EAX is 0), or some memory allocation mishap.

Cheers,
/mz