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Re: Removing scripts

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From "Christoph M. Becker" <cmbecker69@arcor.de>
Newsgroups comp.lang.javascript
Subject Re: Removing scripts
Date Sun, 11 Jan 2015 14:47:03 +0100
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Thomas 'PointedEars' Lahn wrote:

> Christoph M. Becker wrote:
> 
>> Tim Streater wrote:
>>> I have some untrusted HTML, so I want to de-activate any <scripts> it
>>> contains before shoving it into an iframe. Is there any reason not to
>>> do the following?
>>> […]
>>> iframePtr.open ();
>>> iframePtr.write (new XMLSerializer().serializeToString (newdoc));
>>> iframePtr.close ();
>>
>> Have you considered event handler attributes?
> 
> Pardon?

The given script[1] only caters for script elements.  One reason not to
use it would be that event handlers on elements could contain malicious
script code, which would pass this "clean up".

> In general, filtering needs to be done server-side,

ACK.  However, a black listing approach is likely to be insufficient anyway.

[1] <news:100120151843135093%timstreater@greenbee.net>

-- 
Christoph M. Becker

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Thread

Removing scripts Tim Streater <timstreater@greenbee.net> - 2015-01-10 18:43 +0000
  Re: Removing scripts Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-01-10 22:32 +0100
  Re: Removing scripts Richard Damon <Richard@Damon-Family.org> - 2015-01-10 22:07 -0500
    Re: Removing scripts Tim Streater <timstreater@greenbee.net> - 2015-01-11 09:16 +0000
  Re: Removing scripts "Christoph M. Becker" <cmbecker69@arcor.de> - 2015-01-11 12:56 +0100
    Re: Removing scripts Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-01-11 14:23 +0100
      Re: Removing scripts "Christoph M. Becker" <cmbecker69@arcor.de> - 2015-01-11 14:47 +0100
    Re: Removing scripts Tim Streater <timstreater@greenbee.net> - 2015-01-11 15:08 +0000

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