Full Disclosure mailing list archives
Re: Re: RealVNC/WinVNC Multiple vulnerabilities
From: Simon Roberts <thorpflyer () yahoo com>
Date: Tue, 21 Jun 2005 09:07:36 -0700 (PDT)
Can't say I agree that a VNC server implementation should simply refuse to run in such a mode. There are plenty of situations where you being able to get to my server implies that I've already suffered a massive security breach anyway. Under those conditions, I think the "balance" approach applies: let me use no authentication and maybe I'll use a half-decent password, or put up with a "real" protection mechanism, where it really matters. Like how I get in through my firewall, instead of how I mess around inside it. Even if this binary is fixed so no-auth isn't possible, if you're letting your users configure this rather than giving it to them in a centrally controlled fashion, then perhaps you already have worse problems, like they can probably install their own software, etc... Anyway, I guess my point is that it's my humble opinion that you don't have the right to mandate the security vs. convenience balance for everyone else. Just $0.02, obviously, Cheers, Simon --- class <ad () class101 org> wrote:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1Of 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 () realvnc com [mailto:vnc-list-admin () realvnc com] On Behalf Of class101 () phreaker net Sent: 19 June 2005 15:35 To: vnc-list () realvnc com Cc: Full-Disclosure Subject: RealVNC/WinVNC Multiple vulnerabilitiesTwo 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 () realvnc com To remove yourself from the list visit: http://www.realvnc.com/mailman/listinfo/vnc-list-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (MingW32) iD8DBQFCttl9LyZ8K9aT7rARApBzAJsHl81GPtNFi7tUeNIif8agJO2OoQCZAVjE QU7mktxxg1nZbPX+dLKuOqA= =gGqf -----END PGP SIGNATURE----- _______________________________________________ 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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Current thread:
- RealVNC/WinVNC Multiple vulnerabilities class101 () phreaker net (Jun 19)
- RE: RealVNC/WinVNC Multiple vulnerabilities James Weatherall (Jun 20)
- Re: RealVNC/WinVNC Multiple vulnerabilities class101 () phreaker net (Jun 20)
- Re: RealVNC/WinVNC Multiple vulnerabilities class (Jun 20)
- RE: RealVNC/WinVNC Multiple vulnerabilities James Weatherall (Jun 20)
- Re: RealVNC/WinVNC Multiple vulnerabilities class (Jun 20)
- RE: RealVNC/WinVNC Multiple vulnerabilities James Weatherall (Jun 20)
- Re: RealVNC/WinVNC Multiple vulnerabilities class101 () phreaker net (Jun 20)
- Re: Re: RealVNC/WinVNC Multiple vulnerabilities Simon Roberts (Jun 21)
- RE: RealVNC/WinVNC Multiple vulnerabilities James Weatherall (Jun 20)
- RE: RealVNC/WinVNC Multiple vulnerabilities James Weatherall (Jun 20)