Vulnerability Development mailing list archives
Fortigate Bypass
From: digicrimes () gmail com
Date: 19 Jul 2006 06:14:12 -0000
Today when I was trying to see how strong the fortiguard filters where I had stepped upon some thing interesting . Note : fortiguard clearly says that none of their filters work on HTTPS ;) so you guys need to decide if its worth the money u shell in hehe Scenario 1 Say you have blocked Web based email in your fortiguard policy and you check it by going to http://www.gamil.com . you see that you could have access to the login page of gamil in spite of blocking it. So you try to log in and see its it blocks and once you log in it block perfectly saying its a Webbased email site. And you url would read " Http://mail.google.com/mail/?auth=DQAAAG0AAADkxf81BT4k5Q_dw7zQsGO2RuHEQ55IOMzbimKF8Ia7WbQZHvXuVo7o5smHQGg9C_nC4SQz2ofiC3hhc8q4Ar14V-PqgtawN>>>>>>> in your browser. But if a user prefix the same url with a https instead of Http he can get into his Gmail account. The firewall is unable to even log this activity ( memory logging). Scenario 2 Lets take an example of Proxy avoidance ( I know its a nightmare for admins) . say a user tries to access http://www.kproxy.com . Fortiguard beautifully blocks it under the Proxy avoidance category. But if the user prefix a https then he can get into the site and from there he is virtually un stoppable form accessing any shit he wants ( no logs again). Solution 1 You need to input a policy that Block all the Https protocols. Well if you do this all the ligament sites such as ( MSDN just an example ) or say your Ims would get blocked. If you want to exclude suck secure sites you need to go and find all the ips they would use ( thats not really easy) and then allow then Https access. Solution 2 Find all the sites that allow Https Proxy and block them. Just a reminder that each of the would have tone of ips and most of them keep changing frequently. Solution 3 Fortiguard makes the filters work with https :D Tried on Fortinet OS 3 Mr1 Fortinet OS 3 Mr2 hardware FG60 FG60A FG100A Fg200A remote-exploit.org
Current thread:
- Fortigate Bypass digicrimes (Jul 19)
- Re: Fortigate Bypass Louis Wang (Jul 19)
- Re: Fortigate Bypass Mario Platt (Jul 20)
- Re: Fortigate Bypass Eddie Bell (Jul 20)
- Re: Fortigate Bypass Louis Wang (Jul 19)