Re: FireFox3 annoyances

Michel Arboi <[email protected]>
Newsgroups gmane.comp.security.nessus.general
Organization Nessus.org
Message-ID <20080914114753.6f58887f@casserole>
On Wed, 10 Sep 2008 17:00:03 -0500
"Doty, Timothy T." <[email protected]> wrote:

> I was just trying to verify a vulnerability identified by nessus that
> involved a web server and pasting the reported URL into FireFox3 gave
> no result. I noticed that it also collapsed the URL (the
> vulnerability involves directory back references). Using IE verified
> the result.

Firefox 2 on Linux collapses ../../.. too.
This is common. IE collapses some forms of directory traversal too.
You may try different browsers; GET from libwww-perl is probably
more reliable. See http://search.cpan.org/~gaas/libwww-perl-5.814/

In some cases, Nessus' build_url() function must add a / at
the beginning of the query string to get a syntactically correct URL. 
e.g. if flaw appears when the web server receives "..\..\boot.ini",
Nessus will report "http://host/..\..\boot.init"
If you click on that, your browser (or GET from libwww-perl) will send
"/..\..\boot.ini" which might not work as expected. To reproduce the
flaw, you'll have to run
echo -ne 'GET ..\..\boot.ini HTTP/1.1\r\nHost: host\r\n\r\n' | 
  netcat ip 80
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