Date: Tue Jun 21 01:04:56 2005
From: jnw at realvnc.com (James Weatherall)
Subject: RE: RealVNC/WinVNC Multiple vulnerabilities

"class101",

As I've stated previously, "No Authentication" must be explicitly configured
and is not enabled by default.  What makes you think the servers in question
aren't intended to be configured that way?

FYI, "passworded means it's passworded" isn't really a very helpful
description, given that "password" is a noun!  It sounds like dfind's
developers really mean "Is configured to require a password".  Again, you
may wish to suggest a change of text to them.

Cheers,

Wez @ RealVNC Ltd.


> -----Original Message-----
> From: class [mailto:ad@...ss101.org] 
> Sent: 20 June 2005 15:58
> Cc: James Weatherall; vnc-list@...lvnc.com; 'Full-Disclosure'
> Subject: Re: RealVNC/WinVNC Multiple vulnerabilities
> 
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>  
> > Of course, if you think you know of any viable attacks on VNC
> > servers then feel free to get in touch.
> 
> sure I have mailed you a nice list of ip:5900 shomydeskt0p :) funny no
> ? good lines ? ;)
> 
> > The output that you've included just seems to show that (assuming
> > "passworded" means "was able to guess password") your VNC Servers
> > have been configured with poorly chosen passwords.
> 
> passworded mean its passworded , nothing much, my scan doesnt include
> any password brteforce, but it show you how easy it is to scan for
> your app with "No authentications", who is enough crazy thos days to
> add such options ? so easy hacking :)
> 
> >
> >> The output that you've included just seems to show that (assuming
> >> "passworded" means "was able to guess password") your VNC
> >> Servers have been configured with poorly chosen passwords.
> >
> >
> >
> >
> >
> >>> -----Original Message----- From: vnc-list-admin@...lvnc.com
> >>> [mailto:vnc-list-admin@...lvnc.com] On Behalf Of
> >>> class101@...eaker.net Sent: 19 June 2005 15:35 To:
> >>> vnc-list@...lvnc.com Cc: Full-Disclosure Subject:
> >>> RealVNC/WinVNC Multiple vulnerabilities
> >>>
> >
> >> Two simple vulnerabilities wich may lead to an os guess + null
> >> session + several others infos while scanning port 5900, low risk
> >> on paper but high online risk:
> >
> >> My 2cent suggestion to the realvnc team would be to totally
> >> remove this "No Authentication" option wich wasnt present in the
> >> oldold winvnc, and to standardize what is answering all your
> >> servers to restrict the private informations guessing.
> >
> >
> >> quick screenshot( of a simple dfind scanning test on a range that
> >> I thought really secured :>):
> >
> >> ***.7.41:5900 realvnc4 ssl encryption ***.16.83:5900 realvnc4
> >> passworded (free ed. win32) ***.16.91:5900 realvnc4 passworded
> >> (free ed. win32) ***.16.113:5900 realvnc4 passworded (free ed.
> >> win32) ***.16.163:5900 realvnc4 passworded (free ed.
> >> x86/SPARC/HPUX) ***.16.180:5900 realvnc4 passworded (free ed.
> >> x86/SPARC/HPUX) ***.16.202:5900 RealVNC4 NULL Session (free ed.
> >> x86/SPARC/HPUX) ***.16.237:5900 realvnc4 passworded (free ed.
> >> x86/SPARC/HPUX) ***.22.217:5900 realvnc4 passworded (free ed.
> >> x86/SPARC/HPUX) ***.29.91:5900 realvnc4 passworded (free ed.
> >> x86/SPARC/HPUX) ***.29.92:5900 RealVNC4 NULL Session
> >> (perso/enterp ed. win32 encryption:OFF) ***.29.93:5900 realvnc4
> >> passworded (free ed. x86/SPARC/HPUX) ***.29.157:5900 realvnc4
> >> passworded (perso/enterp ed. win32 encryption:OFF)
> >> ***.29.201:5900 realvnc4 passworded (free ed. x86/SPARC/HPUX)
> >> ***.29.234:5900 realvnc4 passworded (free ed. win32)
> >> ***.35.45:5900 realvnc4 passworded (perso/enterp ed. win32
> >> encryption:ON) ***.40.192:5900 RealVNC4 NULL Session
> >> (perso/enterp ed. win32 encryption:ON)
> >
> >> If you are seeking for more informations and you are from
> >> @realvnc.com, email me, or else look at class101.org and
> >> hat-squad.com
> >
> > _______________________________________________ VNC-List mailing
> > list VNC-List@...lvnc.com To remove yourself from the list visit:
> > http://www.realvnc.com/mailman/listinfo/vnc-list
> >
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