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Open Source and information security mailing list archives
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Date: Wed, 25 Jan 2012 21:35:01 +1100 From: GloW - XD <doomxd@...il.com> To: Christian Sciberras <uuf6429@...il.com> Cc: full-disclosure@...ts.grok.org.uk Subject: Re: VNC viewers: Clipboard of host automatically sent to remote machine Windows is even more secure, have you actually, read any of the code / On 25 January 2012 21:30, Christian Sciberras <uuf6429@...il.com> wrote: > That's not necessarily true. On windows you can add custom clipboard formats > that would contain a 'link' to the original source, causing the data to be > actually > passed when pasting. An example of this is when one copy+pastes a file. > See the Windows Clipboard API for more info. > > Chris. > > > > On Wed, Jan 25, 2012 at 10:54 AM, Mario Vilas <mvilas@...il.com> wrote: >> >> I'm not sure how the clipboard works in Linux desktops (I understand >> it's a little different), but at least in Windows environments data >> has to be copied to the clipboard when you hit Ctrl-C. It can't be >> copied when you hit Ctrl-V because then the applications wouldn't know >> if there is anything to paste (like you said, the button would be >> grayed). >> >> So to replicate this behavior it's necessary to send the data as it's >> copied, not as it's pasted. Most (not all, but most) desktop systems >> assume clipboard data can be freely shared with all applications and >> don't have any kind of isolation at all. VNC was designed with the >> same idea. >> >> The bottom line is, the problem here is using VNC for what Ben is >> using it. There are many more problems with that scenario and >> clipboard sharing may be the least of them. >> >> On Wed, Jan 25, 2012 at 8:44 AM, Peter Osterberg <j@....nu> wrote: >> > On 01/24/2012 07:18 PM, Mario Vilas wrote: >> >>> Guys, could you please read carefully everything before you reply? >> >> I read carefully. It still didn't make sense, though. >> >> >> >>> And you wouldn't be allowed to use copy&paste while you edit sensitive >> >>> documents either, I guess? >> >> I don't know how you could get to such a conclusion from what I wrote. >> >> >> >> You're reporting that if you copy and paste sensitive information and >> >> connect to a VNC session your clipboard data gets sent to the remote >> >> machine. That's pretty obvious and not a security hole that needs to >> >> be plugged. >> > >> > I don't think that is what Ben is saying. The clipboard get sent to the >> > the server even before it is pasted, this happens without the user >> > knowing of it. >> > >> > Notepad would have the paste button grayed otherwise, if the clipboard >> > is empty, right? So it is already on the server before paste is pressed. >> > >> > So what ever was in the clipboard buffer is transmitted to the server on >> > connection. >> > >> > This is at least the assumption I make from reading Ben's mails. Or... >> > Is there a cliboard flag saying there is something on the clipboard, but >> > it isn't transmitted until the user actually pastes? I haven't really >> > got any experience with how the clipboard feature is implemented. My >> > assumption is however that it has to be on server for notepad to be >> > aware that Paste shouldn't be grayed out... >> > >> > I think Ben's report make complete sense actually, it would be better to >> > have the clipboard feature as a default. Security before features... =) >> > >> > _______________________________________________ >> > Full-Disclosure - We believe in it. >> > Charter: http://lists.grok.org.uk/full-disclosure-charter.html >> > Hosted and sponsored by Secunia - http://secunia.com/ >> >> >> >> -- >> “There's a reason we separate military and the police: one fights the >> enemy of the state, the other serves and protects the people. When the >> military becomes both, then the enemies of the state tend to become >> the people.” >> >> _______________________________________________ >> 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/ _______________________________________________ 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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