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Windows Explorer may expose FTP passwords in plaintext
Windows Explorer may expose FTP passwords in plaintext

Windows Explorer may expose FTP passwords in plaintext

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Subject Author Date
Windows Explorer may expose FTP passwords in plaintext Brian Knittel 07-18-2008
Posted by Steve Riley [MSFT] on July 21, 2008, 1:46 am
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I look at it this way... in the particular case of unencrypted FTP URLs,
since the "userid:password" portion of the URL will be logged in cleartext
in plenty of places besides the user's own profile, I don't see that there's
much additional risk here.

--
Steve Riley
steve.riley@microsoft.com
http://blogs.technet.com/steriley
http://www.protectyourwindowsnetwork.com



>> Please understand the science here. If a protocol is insecure on the
>> wire, then there's zero benefit in trying to hide any aspects of that
>> protocol conversation on the individual computer itself. Besides, the
>> displayed password (retrieved from the URL history in this case) is
>> displayed only to the particular user who's logged on. If some other user
>> logs onto the PC, then that user can't see the first user's history
>> (local admins excepted, of course).
>
> Your first two sentences are a bit of a copout, Steve.
>
> Plenty of people use FTP securely - say, for instance, over an encrypted
> VPN, or over IPsec.
>
> As for the remaining sentences, it's worth noting that in most other
> places where you enter a password, the password is blanked out, even
> though it is indeed your own password.
>
> The old "my password? yeah, it's eight stars" joke reminds us that
> passwords, where they can be recognised as such, should always be hidden
> from view. Otherwise, shoulder-surfing gets much easier.
>
> Or are you planning on spreading this message throughout Windows, and
> having the logon screen echo the password back to the user as they type
> it?
>
> Alun.
> ~~~~
> --
> Texas Imperial Software | Web: http://www.wftpd.com/
> 23921 57th Ave SE | Blog: http://msmvps.com/alunj/
> Woodinville WA 98072-8661 | WFTPD, WFTPD Pro are Windows FTP servers.
> Fax/Voice +1(425)807-1787 | Try our NEW client software, WFTPD Explorer.
>
>

Posted by Alun Jones on July 21, 2008, 10:59 am
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> I look at it this way... in the particular case of unencrypted FTP URLs,
> since the "userid:password" portion of the URL will be logged in cleartext
> in plenty of places besides the user's own profile, I don't see that
> there's much additional risk here.

I look at it this way... in the particular case of unencrypted FTP URLs,
browsers - Internet Explorer included - have been woefully remiss in
displaying and storing something that they know to be a password.

Perhaps it'd be a good idea to secure all of those places before
implementing FTPS.

Alun.
~~~~
--
Texas Imperial Software | Web: http://www.wftpd.com/
23921 57th Ave SE | Blog: http://msmvps.com/alunj/
Woodinville WA 98072-8661 | WFTPD, WFTPD Pro are Windows FTP servers.
Fax/Voice +1(425)807-1787 | Try our NEW client software, WFTPD Explorer.



Posted by Stefan Kanthak on July 20, 2008, 7:38 am
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> Please understand the science here.

Which "science"?

> If a protocol is insecure on the wire,
> then there's zero benefit in trying to hide any aspects of that protocol
> conversation on the individual computer itself.

Why have MSFT programs like Internet Explorer, Outlook, Outlook Express
and Windows Mail then this useless feature with zero benefit to hide
passwords for "Basic HTTP Auth", POP3, IMAP or SMTP (with plain auth)?


Stefan


Posted by S. Pidgorny on July 20, 2008, 4:42 am
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G'day:

>
>> So the risk it that the user's own password is displayed to the user?
>
> Apparently you missed the point -- COMPLETELY!

No I didn't.

> 1. A previously entered password must NEVER be displayed to any user.

I don't see a problem if it's the user's own password.

> 2. Think of a shared computer in a public place.

It's not secure by definition, therefore mustn't be used by acessing
supposedly protected, personal information, via ftp or toherwise.

--
Svyatoslav Pidgorny, MS MVP - Security, MCSE
-= F1 is the key =-

* http://sl.mvps.org * http://msmvps.com/blogs/sp *



Posted by Stefan Kanthak on July 20, 2008, 7:32 am
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> G'day:
>
>>
>>> So the risk it that the user's own password is displayed to the user?
>>
>> Apparently you missed the point -- COMPLETELY!
>
> No I didn't.

You did.-)

>> 1. A previously entered password must NEVER be displayed to any user.
>
> I don't see a problem if it's the user's own password.

So you won't see a problem if the login dialog/screen prints the users
password too?
Or any other dialog, for example in Outlook, Outlook Express, Windows
Mail, ..., where a "remembered" password can be used?
Get real!

>> 2. Think of a shared computer in a public place.
>
> It's not secure by definition, therefore mustn't be used by acessing
> supposedly protected, personal information, via ftp or toherwise.

The emphasis lies on THINK.
Please contruct another more appropriate example yourself, say: you
help your neighbor with his/her computer and login to one of yours
from said neighbors computer. Shall that password be displayed to
you neighbor?

Stefan


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