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Re: Google's robots.txt handling
From: Philip Whitehouse <philip () whiuk com>
Date: Tue, 11 Dec 2012 12:54:37 +0000

Is this the case even when there is an entry in robots.txt for robots.txt

Philip Whitehouse

On 11 Dec 2012, at 12:22, Ulisses Montenegro <ulisses.montenegro () gmail com> wrote:

If I understand the OP correctly, he is not stating that listing something in robots.txt would make it inaccessible, 
but rather that Google indexes the robots.txt files themselves, and makes the contexts of those available for query. 
So, in a way, they make it easier for Google search results harvesters to find sites which host files/directories of 
known applications, while Google does not index those directories/files themselves because it follows the robots.txt 
restrictions. In a nutshell:

[Attacker] Google, show me sites that have public /wp-admin/ directories.
[Google] I don't know about that, I was not allowed to index those.
[Attacker] Ok, so show me the hosts that have robots.txt files which disallow indexing /wp-admin/ directories, then...
[Google] Sure thing, here you go!

Yes, the fact that those resources are out there in the open makes the effort of hiding them from Google crawlers 
rather useless, but still Google should not allow queries on the contents of robots.txt files, as it sort of beats 
the purpose of disallowing stuff from being indexed...


On Mon, Dec 10, 2012 at 8:19 PM, Scott Ferguson <scott.ferguson.it.consulting () gmail com> wrote:
/From/: Hurgel Bumpf <l0rd_lunatic () yahoo com>
/Date/: Mon, 10 Dec 2012 19:25:39 +0000 (GMT)
------------------------------------------------------------------------
Hi list,


i tried to contact google, but as they didn't answer my email,  i do forward this to FD.
This "security" feature is not cleary a google vulnerability, but exposes websites informations that are not really
intended to be public.

(Additionally i have to say that i advocate robots.txt files without sensitive content and working security 
mechanisms.)

Here is an example:

An admin has a public webservice running with folders containing sensitive informations. Enter these folders in his
robots.txt and "protect" them from the indexing process of spiders. As he doesn't want the /admin/ gui to appear 
in the
search results he also puts his /admin in the robots text and finaly makes a backup to the folder /backup.

<snipped>

This shouldn't be a discussion about bad practice but the google feature itself.

Indexing a file which is used to prevent indexing.. isn't that just paradox and hypocrite?

Thanks,


Conan the bavarian

Your point eludes me - Google is indexing something which is publicly
available. eg.:- curl http://somesite.tld/robots.txt
So it seems the solution to the "question" your raise is, um, nonsensical.

If you don't want something exposed on your web server *don't publish
references to it*.

The solution, which should be blindingly obvious,  is don't create the
problem in the first place. Password sensitive directories (htpasswd) -
then they don't have to be excluded from search engines (because listing
the inaccessible in robots.txt is redundant).  You must of missed the
first day of web school.

Kind regards.


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-- 
“If debugging is the process of removing software bugs, then programming must be the process of putting them in.” - 
Edsger Dijkstra
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/

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