full-disclosure - state of homograph attacks

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Message-ID: <4207DEB3.5080707@wernig.net>
From: listener at wernig.net (Markus Wernig)
Subject: state of homograph attacks

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Valdis.Kletnieks@...edu wrote:
| On Mon, 07 Feb 2005 11:06:18 PST, Richard Jacobsen said:
|
|
|>Open up firefox, put about:config into the address bar, and then change
|>network.enableIDN to false by double clicking on it.  If it is working
|>successfully, you should get a message "domainname.com could not be
found"
|>when clicking on an IDN link.  You shouldn't need to restart your browser.
|
|
| The actual bug referenced by Gerald is that if you use about:config to
set it,
| it *works* without having to restart, but at the next restart of the
browser,
| the setting no longer works...
|

Yes, it does set network.enableIDN = false, but on startup this seems to
get ignored. What I had to do to disable it (probably a brute hack):
there's a line in ~/.mozilla/firefox/whatever.default/compreg.dat that
reads along the lines of
"{4byteshex-2byteshex-2byteshex-2byteshex-6byteshex},@mozilla.org/network/idn-service;1,,nsIDNService,rel:libnecko.so"

The head of the file says "don't edit", but after deleting the above
line, firefox wasn't able to resolve the punycode url anymore after a
restart.

krgds /markus
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