Firewall Wizards mailing list archives
Re: Firewall best practices
From: Cian Brennan <cian.brennan () redbrick dcu ie>
Date: Wed, 28 Apr 2010 09:13:46 +0100
On Tue, Apr 27, 2010 at 11:12:40AM -0500, Fetch, Brandon wrote:
Too late: http://files.cloudprivacy.net/ssl-mitm.pdf And these devices are already in deployment...now, imagine one of these with a wildcard certificate running at a coffee house, or at the aggregation point within a provider's CO POP...
Where it would generate cert errors for every user? These only make sense where you can install the proxy's wildcard cert on all of the client machines. Neither coffee houes, nor ISPs can do this.
-----Original Message----- From: firewall-wizards-bounces () listserv icsalabs com [mailto:firewall-wizards-bounces () listserv icsalabs com] On Behalf Of John Morrison Sent: Tuesday, April 27, 2010 5:45 AM To: Firewall Wizards Security Mailing List Cc: mjr () ranum com; Firewall Wizards Security Mailing List Subject: Re: [fw-wiz] Firewall best practices My understanding of https (and other PKI-based encryption) is that only the holder of the private key can decrypt the data encrypted with the other (public) key in the pair. My view is that the firewall can only decrypt and inspect https traffic if it is acting as the server to the external client. It can't intercept and decrypt https traffic destined for another device - the real server. If it did https would be worthless. Any hacker could buy such a firewall to sniff and decrypt all https traffic. On 23 April 2010 20:18, <david () lang hm> wrote:On Fri, 23 Apr 2010, Martin Barry wrote:$quoted_author = "Marcus J. Ranum" ;That's why firewalls need to go back to doing what they originally did, and parsing/analyzying the traffic that flows through them, rather than "stateful packet inspection" (which, as far as I can tell, means that there's a state-table entry saying "I saw SYN!")Marcus, are you referring to DPI or proxies or both or something else entirely?If the firewall doesn't understand the data it's passing, it's not a firewall, it's a hub.If an application emulates HTTPS traffic and is proxy aware, how do you tell the difference?There are firewalls on the market that can decrypt HTTPS traffic (and I believe be configured to block any traffic that they can't decrypt) David Lang _______________________________________________ firewall-wizards mailing list firewall-wizards () listserv icsalabs com https://listserv.icsalabs.com/mailman/listinfo/firewall-wizards_______________________________________________ firewall-wizards mailing list firewall-wizards () listserv icsalabs com https://listserv.icsalabs.com/mailman/listinfo/firewall-wizards This message is intended only for the person(s) to which it is addressed and may contain privileged, confidential and/or insider information.. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer. Any disclosure, copying, distribution, or the taking of any action concerning the contents of this message and any attachment(s) by anyone other than the named recipient(s) is strictly prohibited. _______________________________________________ firewall-wizards mailing list firewall-wizards () listserv icsalabs com https://listserv.icsalabs.com/mailman/listinfo/firewall-wizards
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Current thread:
- Re: Firewall best practices, (continued)
- Re: Firewall best practices ArkanoiD (Apr 30)
- Re: Firewall best practices Andre Lima (Apr 30)
- Re: Firewall best practices Dave Piscitello (Apr 28)
- Re: Firewall best practices ArkanoiD (Apr 28)
- Re: Firewall best practices Nate Itkin (Apr 27)
- Re: Firewall best practices Dave Piscitello (Apr 27)
- Re: Firewall best practices Carson Gaspar (Apr 27)
- Re: Firewall best practices Fetch, Brandon (Apr 27)
- Re: Firewall best practices lordchariot (Apr 28)
- Re: Firewall best practices Bruce B. Platt (Apr 30)
- Re: Firewall best practices Cian Brennan (Apr 28)
- Re: Firewall best practices Fetch, Brandon (Apr 28)
- Re: Firewall best practices Mathew Want (Apr 30)
- Re: Firewall best practices ArkanoiD (Apr 30)
- Re: Firewall best practices Marcus J. Ranum (Apr 30)
- Re: Firewall best practices ArkanoiD (Apr 27)
- Re: Firewall best practices Dave Piscitello (Apr 22)
- Re: Firewall best practices Marcus J. Ranum (Apr 15)