How would you describe a simple yet very effective mechanism for sending and receiving unauthorized information or data between machines without alerting any firewalls and IDS's on a network?
Answer(s): A
A covert channel is described as: "any communication channel that can be exploited by a process to transfer information in a manner that violates the systems security policy." Essentially, it is a method of communication that is not part of an actual computer system design, but can be used to transfer information to users or system processes that normally would not be allowed access to the information.
Exhibit:You have captured some packets in Ethereal. You want to view only packets sent from10.0.0.22. What filter will you apply?
Answer(s): B
ip.src tells the filter to only show packets with 10.0.0.22 as the source.
You are sniffing as unprotected WiFi network located in a JonDonalds Cybercafe with Ethereal to capture hotmail e-mail traffic. You see lots of people using their laptops browsing the web while snipping brewed coffee from JonDonalds. You want to sniff their email message traversing the unprotected WiFi network.Which of the following ethereal filters will you configure to display only the packets with the hotmail messages?
Each Hotmail message contains the tag Reply-To:<sender address> and “xxxx-xxxxxx. xxxx.hotmail.com” in the received tag.
Daryl is a network administrator working for Dayton Technologies. Since Daryl’s background is in web application development, many of the programs and applications his company uses are web-based. Daryl sets up a simple forms-based logon screen for all the applications he creates so they are secure.The problem Daryl is having is that his users are forgetting their passwords quite often and sometimes he does not have the time to get into his applications and change the passwords for them. Daryl wants a tool or program that can monitor web-based passwords and notify him when a password has been changed so he can use that tool whenever a user calls him and he can give them their password right then.What tool would work best for Daryl’s needs?
L0phtCrack is a password auditing and recovery application (now called LC5), originally produced by Mudge from L0pht Heavy Industries. It is used to test password strength and sometimes to recover lost Microsoft Windows passwords.John the Ripper is one of the most popular password testing/breaking programs as it combines a number of password crackers into one package, autodetects password hash types, and includes a customisable cracker. It can be run against various encrypted password formats including several crypt password hash typesWinHttrack is a offline browser.A password sniffer would give Daryl the passwords when they are changed as it is a web based authentication over a simple form but still it would be more correct to give the users new passwords instead of keeping a copy of the passwords in clear text.
Ethernet switches can be adversely affected by rapidly bombarding them with spoofed ARP responses. He port to MAC Address table (CAM Table) overflows on the switch and rather than failing completely, moves into broadcast mode, then the hacker can sniff all of the packets on the network.Which of the following tool achieves this?
macof floods the local network with random MAC addresses (causing some switches to fail open in repeating mode, facilitating sniffing).
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