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Most war-driving tools will indicate whether or not a network is using WEP/WPA encryption NetStumbler will show a small padlock in the network s icon and indicate WEP under the encryption column when WEP/WPA encryption is found Kismet will show a Y under the W (for WEP) column when it finds encrypted networks Wireless sniffers will show WEP status as well tcpdump uses the PRIVACY flag when WEP is in use and shows the IV for each packet, when collected, as shown here:

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

00:30:36943042 00:30:36948759 00:30:36949722 00:30:36958387 00:30:36959349 00:30:36968942 00:30:36970242 00:30:36978462 00:30:36979718 00:30:36988863 00:30:36990004 00:30:36998934 00:30:37000148 00:30:37008549 00:30:37009741 Beacon (Aironet_350) Data IV:1aa7f6 Pad 0 Data IV:1ba7f6 Pad 0 Data IV:1ba7f6 Pad 0 Data IV:1ca7f6 Pad 0 Data IV:1ca7f6 Pad 0 Data IV:1da7f6 Pad 0 Data IV:1da7f6 Pad 0 Data IV:1ea7f6 Pad 0 Data IV:1ea7f6 Pad 0 Data IV:1fa7f6 Pad 0 Data IV:1fa7f6 Pad 0 Data IV:20a7f6 Pad 0 Data IV:20a7f6 Pad 0 Data IV:21a7f6 Pad 0 [10 20 55 110 Mbit] ESS CH: 6 , PRIVACY KeyID 0 KeyID 0 KeyID 0 KeyID 0 KeyID 0 KeyID 0 KeyID 0 KeyID 0 KeyID 0 KeyID 0 KeyID 0 KeyID 0 KeyID 0 KeyID 0

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:

GAINING ACCESS (HACKING 80211)

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

Following the proven Hacking Exposed attack methodology, gaining access is the stage of the assessment in which the attacker or auditor, depending on the situation, leverages the information gathered during the initial phases of the assessment The goal for just about all system assessments or acquired targets is to gain administrator or root-level access to the system However, for this to occur, the attacker must know certain types of detailed system, application, and configuration information In the realm of wireless and 80211, gaining system access is significantly different when compared to wired systems In most cases, this is due to a lack of strong WEP- or WPA-enforced encryption, thereby allowing the attacker to crack weak keys and obtain pertinent transmitted data If the attacker has gained access to the AP s WEP key, the WLAN is all but penetrated The small amount of communication information that is still required to effectively gain access should be considered ridiculously elementary when compared to the skill set required to configure and utilize a wireless-crackingcapable system As you will notice, a variety of methods is available to gain access to systems, covering a wide range of effort levels

Popularity: Simplicity: Impact: Risk Rating: 4 2 9 5

Once you have the SSID, you ll need to reconfigure your wireless interface to use it On Windows operating systems, the card vendor will usually provide a utility to reconfigure card settings or an interface in the driver itself to reconfigure the SSID Shown next is the configuration screen for an SMC wireless card and its driver settings The network name has been changed to Linksys, the SSID of the network we wish to connect to