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You ll need to use the SYN or half-scan technique when using the static source port feature of nmap If ports come back as open, you will likely have a vulnerable firewall in your midst To understand the scenario better, here s a diagram that details how the attack works:
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With the discovery that a firewall is not maintaining the state of its firewalled connections, you can now take advantage of this fact by launching attacks against vulnerable systems behind the firewall Using a modified port redirector such as Fpipe from Foundstone, you can set the source port to 20 and then run exploit after exploit through the firewall
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Countermeasure U Source Port Scanningto this vulnerability are simple but not all that glamorous Prevention The solutions
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You ll need to either disable any communications that require more than one port combination (such as traditional FTP) or switch to a stateful- or application-based proxy firewall that keeps better control of incoming and outgoing connections You can t really control how a packet filtering firewall maintains state
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Packet filtering firewalls (including stateful firewalls) such as CheckPoint s Firewall-1, Cisco PIX, and Cisco s IOS (yes, Cisco IOS can be set up as a firewall) depend on access control lists (ACLs), or rules to determine if traffic is authorized to pass into or out of the internal network For the most part, these ACLs are well devised and difficult to get around But every so often, you ll come across a firewall with liberal ACLs, allowing some packets to pass unfettered
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Popularity: Simplicity: Impact: Risk Rating: 8 2 2 8
U Liberal ACLs Countermeasure rules limit who can connect where For example, if Prevention Make sure that your firewall
your ISP requires zone transfer capability, then be explicit about your rules Require a
Liberal access control lists (ACLs) frequent more firewalls than we care to mention Consider the case where an organization may want to allow their ISP to perform zone transfers A liberal ACL such as Allow all activity from the TCP source port of 53 might be employed rather than Allow activity from the ISP s DNS server with TCP source port of 53 and destination port of 53 The risk that these misconfigurations pose can be truly devastating, allowing a hacker to scan your entire network from the outside Most of these attacks begin by an attacker scanning a host behind your firewall and spoofing its source as TCP port 53 (DNS)
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source IP address, and hard-code the destination IP address (your internal DNS server) in the rule you devise If you are using a CheckPoint firewall, you can use the following rule to restrict a source port of 53 (DNS) to only your ISP s DNS For example, if your ISP s DNS is 192168662 and your internal DNS is 172301401, you can use the following rule: Source 192168662 Destination 172301401 Service domain-tcp Action Accept Track Short
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Popularity: Simplicity: Impact: Risk Rating: 8 2 2 8
CheckPoint 30 and 40 provide ports open by default DNS lookups (UDP 53), DNS zone transfers (TCP 53), and RIP (UDP 520) are allowed from any host to any host and are not logged This sets up an interesting scenario once an internal system has been compromised You ve already seen how easy it can be to identify a CheckPoint firewall By using this new knowledge, an attacker can effectively bypass the firewall rules But there is a significant prerequisite to this attack The attack only works once attackers have compromised a system behind the firewall or they have tricked a user on a back-end system into executing a Trojan In either event, the end result is most likely a netcat listener on a compromised system inside your network The netcat listener can either send back a shell or type commands that run locally on the remote system These back doors will be discussed in detail in 14, but a little description here may help you understand the problem As the following illustration shows, CheckPoint allows TCP port 53 through the firewall unlogged When attackers set up a netcat listener on port 53 and shell back
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