full-disclosure - NUL Character Evasion

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Message-ID: <998178607.20050916171642@SECURITY.NNOV.RU>
Date: Fri Sep 16 14:16:50 2005
From: 3APA3A at SECURITY.NNOV.RU (3APA3A)
Subject: NUL Character Evasion

Dear Steffen Kluge,

This is old news reported long time ago by ben moeckel (ben.moeckel at
online.de), see http://www.security.nnov.ru/advisories/content.asp

9. Bypassing filters with special characters

  There  are some characters client application may ignore silently. For
  Example, for HTML browsers:

  0, 9, 10, 13, 173 for Opera
  13, 10, 9, 0 for Internet Explorer

  by inserting characters with this codes into document it's possible to
  hide some dangerous tags from content filter.

  Reported by ben.moeckel at online.de

--Friday, September 16, 2005, 10:25:06 AM, you wrote to full-disclosure@...ts.grok.org.uk:

SK> On Tue, 2005-09-13 at 23:24 +0200, ju@...sec.de wrote:
>> Internet Explorer ignores NUL characters
>> -- i.e. ascii characters with the value 0x00 -- most
>> security software does not.

SK> Interesting. Did you test this with Outlook as well?

SK> Cheers
SK> Steffen.

-- 
~/ZARAZA
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