[WEB SECURITY] Re: Minimal User Interaction with Links

51l3n73y3s 51l3n7 at live.in
Fri Aug 14 19:36:26 EDT 2009


I agree completely with you.

This link 
will not give a certificate problem with IE, but with Mozilla Firefox 3.5.2 
it throws an invalid certificate for the first website in the results page. 
Someone trying to fake a military website, Probably? That is off thread, if 
someone wants to report that. It shouldn't throw the certificate warning at 
all. All I did was to search in Google for "limited users test" (without 
quotes) and coincidentally  it came up as the first result. Perhaps it's 
still the first. A bug's been filed at 
https://bugzilla.mozilla.org/show_bug.cgi?id=510448 cause I think this is 
not normal. It doesn't happen with 3.0, It doesn't happen with IE 6.0.2900 
that I have. The browser is not handling this properly. It should keep that 
to itself(Block it) even if it's checking each link for validity, though I 
don't see a reason why it should even do that.

-Sandeep Cheema

From: "Steven M. Christey" <coley at linus.mitre.org>
Sent: Saturday, August 15, 2009 2:41 AM
To: <micheal.espinola at gmail.com>
Cc: "51l3n73y3s" <51l3n7 at live.in>; <security-basics at securityfocus.com>; 
<websecurity at webappsec.org>
Subject: Re: [WEB SECURITY] Re: Minimal User Interaction with Links

> On Fri, 14 Aug 2009, Micheal Espinola Jr wrote:
>> Under normal circumstances, no, it is not possible in this day and age
>> (i.e with an up-to-date OS) to automatically execute/save a file by
>> clicking a link.
> It's possible to do this automatically, without any user interaction, by
> referencing vulnerable ActiveX controls with insecure exposed methods with
> names like DownloadAndExecuteFile() (see CVE-2008-4586 for example).
> These types of issues are starting to show up fairly regularly in CVE.
> Very few researchers seem to be paying attention to Firefox plug-ins, but
> once they do, I expect to see similar results there, too.
> Theoretically it's within the browsers' security models to avoid the
> automatic save/execute of files, but browser bugs and the aforementioned
> plugin vulnerabilities mean that practically speaking, it's still
> possible.  I assume the more knowledgeable Flash experts among us have
> their own suggestions.
> - Steve
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