Re: Re[2]: DoS vulnerabilities in Firefox, Internet Explorer, Ch
Point taken. But that'd be a non-issue on the browser's end as much as
site's that is allowing the rogue scripts (or malformed ads, as per your
example).
The fork of this mail thread clearly explains what I'm talking about. The
issue noted there is a simple DoS attack which every programming language
and platform is vulnerable too. Its called the "infinite loop". It is not a
'security vulnerability' by itself and is completely agnostic of the uri
handler (try http or anything instead of nntp).
Here's the simplified JS version of it (lets call it the Universal DoS --
yes, it'd work for every browser on the planet that can execute JS) -
<script>
while(1)alert('hello world');
</script>
Done!
Workaround:
None very intuitive. Maybe allow the user to terminate the script at every
iteration? specific time period? etc...
--------------------------------------------------
From: "Vladimir '3APA3A' Dubrovin" <3APA3A@SECURITY.NNOV.RU>
Sent: Friday, May 28, 2010 11:47 PM
To: "John Smith" <at-x@live.com>
Cc: "MustLive" <mustlive@websecurity.com.ua>; "Susan Bradley"
<sbradcpa@pacbell.net>; <bugtraq@securityfocus.com>
Subject: Re[2]: DoS vulnerabilities in Firefox, Internet Explorer, Chrome,
Opera and other browsers
> Dear John Smith,
>
> Actually, browser DoS may be quite serious vulnerability, depending on
> nature of DoS. Think about e.g. banner or content exchange network,
> social networks, web boards, etc where browser vulnerability may be
> used against site or page because it will harm any visitors of this
> site or page.
>
> In case of this very vulnerability, most serious impact may be from
> e-mail vector.
>
> --Friday, May 28, 2010, 7:07:50 PM, you wrote to
> mustlive@websecurity.com.ua:
>
> JS> Just a few cents - DoS in webbrowsers doesn't fall under the category
> of
> JS> "vulnerabilities" rather more of "annoyances". Although I don't deny
> the
> JS> fact that certain DoS attacks *may lead* or *may serve as hints* to
> other
> JS> more serious exploits, but that's a different topic and with ASLR in
> the
> JS> scene, a very grey area of discussion.
>
>
>
> --
> Skype: Vladimir.Dubrovin
> ~/ZARAZA http://securityvulns.com/
> 栺謥＠碭 碞闉鍣 譇 鍙 黓罻錼玁瀁嚦闉鍙翴蜦. 砐嚦闉鍙膻朢Ｎ
> (砩樇)
>
>