Full Disclosure mailing list archives
Re: RealVNC/WinVNC Multiple vulnerabilities
From: "class101 () phreaker net" <class101 () phreaker net>
Date: Mon, 20 Jun 2005 16:07:25 +0200
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 "RealVNC4 NULL Session" mean "no authentication" and there is tons of vnc using this UNsecured option. as in my scan Radmin21 NULL Session mean also "no authentication" , but they removed it in radmin22, do the same, because in some days, isc sans is gonna cry on 5900 :) there is no ssl ? well I have used what is returning many vnc on the internet, and on somes I got: "RFB 103 006 the connection could not be established because SSL 3.0/TLS 1.0 encryption is required" prolly a mod from your src code, anyway thanx for letting me know :) James Weatherall a écrit :
"Class101", VNC has always provided the option to operate without requiring authentication, there is no such thing as a "RealVNC4 NULL Session", and VNC has never used SSL encryption, so I'm afraid it sounds like someone's been telling you porkies! 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. Of course, if you think you know of any viable attacks on VNC servers then feel free to get in touch. Cheers, Wez @ RealVNC Ltd.-----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 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
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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)