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Re: Filezilla's silent caching of user's credentials
From: Ryan Sears <rdsears () mtu edu>
Date: Thu, 14 Oct 2010 04:23:10 -0400 (EDT)

Ok. Granted I'm not talking about a 0-day in OpenSSH here, but this IS a real issue affecting REAL people. 

I'm not really sure *who* you're trying to take a jab with point 7 and beyond, but I know at least part of it is 
towards me.

Filezilla's behavior is *wrong* and what I was doing was calling for a community push to actually get things changed. I 
was trying to state my point as clearly and concisely as I possibly could, because I feel with enough of a community 
backing we can actually convince botg to make minor tweaks to his source code, and come to some kind of compromise.

Show me another widely-used, widely-accepted program that really does stuff like this. I haven't really encountered 
them (I could be mistaken though, and I'm fine with being corrected). 

I'm pretty sure you were trying to state that I was below you in some way, and I very well may be. This is a community 
full of people with varying degrees of technical knowledge and understanding, but we are all subscribed to this list to 
do one thing - learn. How do you learn? By observing. Observing folly's in the way other people have implemented 
things, and how people have done things right. Take the apache.org xss bug that got leveraged into a full compromise of 
their systems, there had to be people who were influenced to start using things like no-script because of it. Then you 
have the other people, who will never change their practices anyway. 

It's really all about the path of exposure, going back to the apache.org thing. That was a 0-day XSS bug (which 
honestly isn't THAT hard to find) that was used to leverage one user's account, which then lead to something, which 
then lead to something else. How do you know that a nuclear scientist didn't have this exact same thing happen to them 
with this filezilla behavior, which then lead to a compromise of a nuclear reactor? 

Just because I don't have something like 10% of all the ZDI bugs under my belt doesn't make my points any less valid. 
Who cares if people choose to write about it? Basically what you're saying is you're afraid of people using the 
internet to write about stuff they're interested in, and voice their opinions. That's in complete contradiction to the 
nature of this list (and the whole internet for that matter), and no matter how hard you close your eyes and wish that 
the internet hadn't given people an anonymous voice to bitch about what they choose, it'll never go away. That's just 
the way it is. 


----- Original Message -----
From: "Chris Evans" <scarybeasts () gmail com>
To: michaelslists () gmail com
Cc: full-disclosure () lists grok org uk, "Mutiny" <mutiny () kevinbeardsucks com>
Sent: Thursday, October 14, 2010 3:51:31 AM GMT -05:00 US/Canada Eastern
Subject: Re: [Full-disclosure] Filezilla's silent caching of user's credentials

On Wed, Oct 13, 2010 at 11:46 PM, silky < michaelslists () gmail com > wrote: 

On Thu, Oct 14, 2010 at 5:39 PM, Christian Sciberras < uuf6429 () gmail com > wrote: 
Not all attackers are created 

I still see this a simple matter of violating KISS to introduce a layer of encryption. 
The question is, to which end? Sure, an attacker might see the encrypted 
file and think it's "too difficult" for him to get to the passwords. Another 
might use a certain utility to decrypt the said file. The thing is, to which end are 
we encrypting the data? Just for the sake of making it work like the N other programs? 
I mean, if this doesn't *work*, why even *bother*? 

Sorry, but your comments are totally useless here and can't even 
really be addressed properly, given their quite ridiculous nature. 

Well done on behaving in a gentlemanly manner and winning people over with your in-depth technical arguments. 

I think you need to break down the problem into the various threats against these stored secrets. 

1) You're worried about some random person who has transient physical access to your logged-in machine. 

2) You're worried about some sophisticated actor who has transient physical access to your machine. 

3) You're worried about your machine getting stolen, or improper disposal of your hard drive. 

4) You're worried about the worst-possible impact of a file-theft bug, perhaps in a browser. 

5) You're worried about having used FileZilla on a public terminal. 

6) You're worried because multiple users without full trust between one another share the same account. 

Feel free to add 7), 8), etc. 

Once you start breaking it down, you realize that you're completely shit-out-of-luck in cases 2), 5) and 6); in case 
1), the worst attacks comprise of writing to the drive and not reading from it; you're negligent if you're worried 
about 3) and don't have full-disk encryption; and 4) is actually the most nuanced and interesting threat yet it doesn't 
seem to be figuring in the reasoning of prior entrants to the thread. 

In fact, given the current state of the security industry, I think I have the worst threat yet: 

7) You're worried about a large number of bike-shedding lower-tier security researchers posting en-masse to f-d. You're 
worried that subsequent to this, some less technical security journalists will pick up on it and write a bunch of 
sensationalist news articles covering what is essentially a minor issue. 

The opening e-mail used or quoted phrases such as "critical deficiency", "total lapse" and "quite disturbing". This 
shows a disappointing misunderstanding of what "critical" really is. 

This bug is not being used to break into nuclear reactors in Iran, or to distribute mass malware. It's important to be 
balanced and realistic whilst discussing security issues. 


are missing the point of the encryption, and it is not my job to 
convince you, and any further comments with anyone other than the 
developer are useless. 

There is no question here. There is no discussion. It should be done, 
and if it is not, password saving should be stopped in FileZilla or an 
alternative program should be sought. It's that simple. 

Great. If it's so simple that it can be done in under 10 mins, go complain 
to them. 

This email thread *is* a direct complaint to them, after bugs have 
been closed for years. I didn't start this thread. Do you even 
understand what is going on here? Your emails suggest you do not. 





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of being this signature." 

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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/

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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