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/bin/sh to their own machine also listening on port 53, the attackers will have a hole through your firewall to any system they ve compromised
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U CheckPoint TrickeryonCountermeasureneeds, you can disable much of the traffic Prevention Depending your configuration
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that is allowed by default Be careful with this prevention fix, as it may disallow authorized traffic to flow through your firewall Perform the following steps to restrict this access: 1 Within the Security Policy GUI, select Policy/Properties 2 Uncheck the Accept check box with all the functions that are unnecessary For example, many sites do not need their users to perform DNS downloads In this case you can uncheck the Accept Domain Name Downloads option The same technique can be used to disable RIP and DNS lookup traffic
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3 Create your own rule that allows DNS traffic from a specific authorized DNS server (as shown in the preceding Liberal ACLs Countermeasure )
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UDP Tunneling Countermeasure U ICMP and You can prevent this type of attack by disabling ICMP access through your Prevention
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firewall altogether or by providing granular access control on ICMP traffic For example, the following Cisco ACL will disallow all ICMP traffic outside of the 17229100 subnet (the DMZ) for administrative purposes:
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access-list 101 permit icmp any 17229100 0255255255 8 ! echo access-list 101 permit icmp any 17229100 0255255255 0 ! echo-reply access-list 102 deny ip any any log ! deny and log all else
ICMP tunneling is the capability of wrapping real data in an ICMP header Many routers and firewalls that allow ICMP ECHO, ICMP ECHO REPLY, and UDP packets blindly through will be vulnerable to this attack Much like the CheckPoint DNS vulnerability, the ICMP and UDP tunneling attack relies on an already compromised system behind the firewall Jeremy Rauch and Mike Schiffman put the tunneling concept to work and created the tools to exploit it: loki and lokid (the client and server) see http://phrackinfonexus com/searchphtml view&article=p49-6 for the complete paper Running the lokid server tool on a system behind a firewall allowing ICMP ECHO and ECHO REPLY enables attackers to run the client tool (loki), which wraps every command sent in ICMP ECHO packets to the server (lokid) The lokid tool will unwrap the commands, run the commands locally, and wrap the output of the commands in ICMP ECHO REPLY packets back to the attacker Using this technique, attackers can completely bypass your firewall This concept and the exploit will be further discussed in 14
If your ISP tracks your system s uptime behind your firewall with ICMP pings (which we never recommend), then these ACLs will break their heartbeat function Check with your ISP to find out if they use ICMP pings to check up on your systems
11:
Firewalls
APPLICATION PROXY VULNERABILITIES
In general, application proxy vulnerabilities are few and far between Once you have secured the firewall itself and implemented solid proxy rules, you ll be hard pressed to bypass a proxy firewall But never fear, misconfigurations are common
Hostname: localhost
Popularity: Simplicity: Impact: Risk Rating: 4 2 9 5
With some older UNIX proxies, it was easy to miss restricting local access Despite authentication requirements for your users when accessing the Internet, it was possible for an internal user to gain local access on the firewall itself Of course, this attack requires knowledge of a valid username and password on the firewall, but you d be surprised how easy these are to guess sometimes To check your proxy firewalls for this vulnerability, you can do the following When you receive this login screen
C:\> nc -v -n 19216851129 23 (UNKNOWN) [19216851129] 23 ( ) open Eagle Secure Gateway Hostname:
1 Type in localhost 2 Enter a known username and password (or guess a few) 3 If authentication works, you have local access on the firewall 4 Run a local buffer overflow (like rdist) or similar exploit to gain root
localhost Countermeasure U Hostname:The fix for this misconfiguration depends largely on the specific firewall Prevention
product In general you can provide a host restriction rule that limits the access from a particular site The ideal countermeasure is to not allow localhost logins If you require localhost logins, you should implement Wieste Venema s TCP Wrappers program (ftp:// coastcspurdueedu/pub/tools/unix/tcp_wrappers/) to restrict by IP address the hosts allowed to connect
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