bugtraq - Re: xpdf vulnerability

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Message-ID: <87vfubeb5h.fsf@cain.internet2.edu>
Date: 09 Jul 2003 15:46:18 -0400
From: stanislav shalunov <shalunov@...ernet2.edu>
To: Andries.Brouwer@....nl
Subject: Re: xpdf vulnerability - CAN-2003-0434


Andries.Brouwer@....nl writes:

> A urlCommand like the default "netscape -remote 'openURL(%s)'"
> is OK since the %s is protected by single quotes.

How so?  Consider an argument of
	'`rm -rf /tmp/test`'
This expands to
	netscape -remote 'openURL('`rm -rf /tmp/test`')'
where the single quotes have no effect.

A proper fix would be not to invoke shell at all, but simply fork and
exec.

-- 
Stanislav Shalunov		http://www.internet2.edu/~shalunov/

"The power of accurate observation is commonly called cynicism by
those who have not got it."			-- G. B. Shaw