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Re: BUG in /bin/bash
From: espel () clipper ens fr (Roger Espel Llima)
Date: Fri, 13 Sep 1996 11:24:05 +0200


VULNERABILITY:  A variable declaration error in "bash" allows the character
                with value 255 decimal to be used as a command separator.

  That reminds me of a similar "little-known feature" on SunOS and
Solaris, where /bin/sh interprets '^' as a synonym for '|' :

$ sh -c 'echo blah ^ cat'
blah

  Again this could be exploited to fool CGI scripts (and ircII scripts
too) which execute shell commands with user-supplied data, after
checking for things like ';', '|' and '&'.

        -Roger
--
e-mail: roger.espel.llima () ens fr
WWW & PGP key: http://www.eleves.ens.fr:8080/home/espel/index.html



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