Security Basics mailing list archives
RE: Blocking ssl vpn connections
From: "Hayes, Ian" <Ian.Hayes () wynnlasvegas com>
Date: Mon, 27 Mar 2006 15:28:43 -0800
-----Original Message----- From: David Gillett [mailto:gillettdavid () fhda edu] Sent: Monday, March 27, 2006 9:39 AM To: 'Andrew Stewart'; security-basics () securityfocus com Subject: RE: Blocking ssl vpn connections You need an "SSL proxy" (as your firewall) to do this. Essentially it's a *authorized* "main in the middle", decrypting and examining the data stream. At a minimum, it can verify that this traffic using port 443 really is HTTPS. Some can also filter the stream for malware and illicit content as well. [Check out Blue Coat -- I think they have a White Paper up about the things that their boxes can offer.]
I've used them before. I thought I was rather clever tunneling SSH traffic out through an SSL wrapper to my server at home, but apparently the guys running the box saw something that didn't look quite right. But what really sucked was that none of us could figure out how to block it with the Bluecoat. Their instructions seemed really focused on blocking tunneled traffic that came from httptunnel. I was using something else that seemed to completely baffle the Bluecoat, but at least it was being detected. Ian Hayes | Senior Systems Engineer Wynn Las Vegas 3131 South Las Vegas Blvd, Las Vegas, NV 89109 Ph (702) 770-3252 | Cell (702) 266-6002 Ian.hayes () wynnlasvegas com --------------------------------------------------------------------------- EARN A MASTER OF SCIENCE IN INFORMATION ASSURANCE - ONLINE The Norwich University program offers unparalleled Infosec management education and the case study affords you unmatched consulting experience. Tailor your education to your own professional goals with degree customizations including Emergency Management, Business Continuity Planning, Computer Emergency Response Teams, and Digital Investigations. http://www.msia.norwich.edu/secfocus ---------------------------------------------------------------------------
Current thread:
- Blocking ssl vpn connections Andrew Stewart (Mar 24)
- Re: Blocking ssl vpn connections Aaron Rohyans (Mar 27)
- RE: Blocking ssl vpn connections Brent P. Gardner (Mar 27)
- RE: Blocking ssl vpn connections David Gillett (Mar 27)
- <Possible follow-ups>
- RE: Blocking ssl vpn connections Hayes, Ian (Mar 28)
- Re: RE: Blocking ssl vpn connections barcajax (Mar 28)
- Re: RE: Blocking ssl vpn connections Joe (Mar 29)