oss-sec mailing list archives
Attack on badly configured Netfilter-based firewalls
From: Eric Leblond <eric () regit org>
Date: Sat, 25 Feb 2012 19:37:14 +0100
Hello, I've discovered a generic attack on firewall using Application Level Gateway (like Netfilter or Checkpoint). Impact: An attacker on a local network can open some pinholes in a firewall which is not correctly protected. Fix: None, the issue has to be fixed in the firewall configuration. Workaround: Apply a strict anti-spoofing policy for IPv4 and IPv6 as described in the document "Secure use of iptables and connection tracking helpers" This document was written after private disclosure of the attack to the Netfilter's team. This attack will be presented at Cansecwest, March 9th 2012. Secure use of iptables and connection tracking helpers: http://home.regit.org/netfilter-en/secure-use-of-helpers/ Best regards, -- Eric Leblond Blog: http://home.regit.org/
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Current thread:
- Attack on badly configured Netfilter-based firewalls Eric Leblond (Feb 25)
- Re: Attack on badly configured Netfilter-based firewalls Yves-Alexis Perez (Feb 25)
- Re: Attack on badly configured Netfilter-based firewalls Eric Leblond (Feb 26)
- Re: Attack on badly configured Netfilter-based firewalls Eugene Teo (Feb 26)
- Re: Attack on badly configured Netfilter-based firewalls Solar Designer (Feb 26)
- Re: Attack on badly configured Netfilter-based firewalls Eric Leblond (Feb 27)
- Re: Attack on badly configured Netfilter-based firewalls Eric Leblond (Mar 09)
- Re: Attack on badly configured Netfilter-based firewalls ArkanoiD (Mar 09)
- Re: Attack on badly configured Netfilter-based firewalls Eric Leblond (Mar 09)
- Re: Attack on badly configured Netfilter-based firewalls Kurt Seifried (Mar 09)
- Re: Attack on badly configured Netfilter-based firewalls Eric Leblond (Feb 26)
- Re: Attack on badly configured Netfilter-based firewalls Yves-Alexis Perez (Feb 25)
- Re: Attack on badly configured Netfilter-based firewalls Jussi Eronen (Mar 02)