full-disclosure - Re: Firefox + popup blocker + XMLHttpRequest + srand() = oops

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Message-ID: <Pine.LNX.4.58.0702051338320.30846@dione>
Date: Mon, 5 Feb 2007 13:44:22 +0100 (CET)
From: Michal Zalewski <lcamtuf@...ne.ids.pl>
To: "pdp (architect)" <pdp.gnucitizen@...glemail.com>
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: Re: Firefox + popup blocker + XMLHttpRequest +
 srand() = oops

On Mon, 5 Feb 2007, pdp (architect) wrote:

> You may as well use a QuickTime .mov/.qtl or a PDF document to open a
> file:// link . I think it is easier.

Sure. You can probably have a file:// link in Open Office / MS Office
documents as well; but these all rely on external components, and as such,
attacks could be shrugged off as a weakness in these apps (and there's
some truth to this).

Browser authors know better, and they disallow file:// URLs from the
Internet ever since Javascript became so powerful; this case managed to
slip through, so I thought it's a neat example, in conjunction with
deterministic temporary files.

/mz

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