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Local authentication to Windows 2000 via the CTRL-ALT-DEL attention signal is straightforward, as we have described However, logging on to Windows 2000 via the network, the primary goal of the malicious hacker, involves exploiting network authentication We will discuss this here briefly to inform discussions in later chapters on several weaknesses associated with some components of Windows 2000 network authentication protocols Both NT and 2000 primarily utilize challenge/response authentication, wherein the server issues a random value (the challenge) to the client, which then performs a cryptographic hashing function on it using the hash of the user s password and sends this newly hashed value (the response) back to the server The server then takes its copy of the user s hash from the local SAM or AD, hashes the challenge it just sent, and compares it to the client s response Thus, no passwords ever traverse the wire during Windows NT/2000 authentication, even in encrypted form The challenge/response mechanism is illustrated in Figure 2-4 and is described more fully in KB Article Q102716 Step 3 of this diagram is the most critical NT/2000 can use one of three different hashing algorithms to scramble the 8-byte challenge: w s v LANMan (LM) hash NTLM hash NTLM version 2 (NTLMv2)

In 5, we will discuss a weakness with the LM hash that allows an attacker with the ability to eavesdrop on the network to guess the password hash itself relatively easily, and then use it to attempt to guess the actual password offline Yes, even though the password hash never traverses the network! To combat this, Microsoft released an improved NT-only algorithm, NTLM, with NT4 Service Pack 3 and a further secured version in NT4 SP4 called NTLM v2 Windows 95/98 clients do not natively implement NTLM, so the security offered by NTLM and NTLMv2 was not typically deployed on mixed networks in the past (the DSClient utility that comes on the Windows 2000 CD-ROM upgrades Windows 9x clients so that they can perform NTLM and NTLMv2 authentication)

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Checklist of shock symptoms: Skin that is pale, blue, or cold to the touch Skin that is moist and clammy General weakness Pulse rate in excess of 100 beats per minute Increased breathing Shallow breathing Thrashing

Figure 2-4

Homogenous Windows 2000 environments can use the built-in Kerberos v5 protocol that is new in Windows 2000 (we discuss Windows 2000 Kerberos in 16) However, Windows 2000 is completely backward compatible with LM, NTLM, and NTLMv2 and will downgrade to the appropriate authentication protocol if Kerberos cannot be negotiated Kerberos will only be used if both client and server support it, both machines are referenced by their DNS or machine name (not IPaddress), and both the client and server belong to the same forest (unless a third-party Kerberos implementation is used) Table 2-6 presents a quick summary of NT/2000 LAN oriented authentication mechanisms For simplicity s sake, we have purposely left out of this discussion consideration of Microsoft s Challenge Handshake Authentication Protocol (MS-CHAP), which is used for remote access, Web-based authentication, as well as other protocols used by

Burns are not very common among electricians, but they can occur in the workplace There are three types of burns that you may have to deal with First-degree burns are the least serious These burns typically come from overexposure to the sun, quick contact with a hot object, or contact with scalding water from working with a boiler or water heater Second-degree burns are more serious They can come from a deep sunburn or from contact with hot liquids and flames A person who is affected by a second-degree burn may have a red or mottled appearance, blisters, and a wet appearance of the skin within the burn area This wet look is due to a loss of plasma through the damaged layers of skin Third-degree burns are the most serious They can be caused by contact with open flames, hot objects, or immersion in very hot water Electrical injuries can also result in third-degree burns This type of burn can look similar to a second-degree burn, but the difference will be the loss of all layers of skin

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Comments WFW and Windows 9x must use this, but it is susceptible to eavesdropping attacks; Dsclient allows Windows 9x to use NTLM Much more robust security than LANMan Improved security over NTLM, recommended for heterogeneous NT4/2000 environments Longer track record security-wise, but only used if end-to-end Windows 2000 and intra-forest

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