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Having gained Administrator, attackers will most likely make a beeline to the NT Security Accounts Manager (SAM) The SAM contains the usernames and encrypted passwords of all users on the local system, or the domain if the machine in question is a domain controller It is the coup de grace of NT system hacking, the counterpart of the /etc/passwd file from the UNIX world Even if the SAM in question comes from a stand-alone NT system, chances are that cracking it will reveal credentials that grant access to a domain controller Thus, cracking the SAM is also one of the most powerful tools for privilege escalation and trust exploitation But wait encrypted passwords, you say Shouldn t that keep malicious hackers at bay Alas, in a key concession to backward compatibility, Microsoft hamstrung the security of the SAM by using a hashing (one-way encryption) algorithm left over from NT s LanManager roots Although a newer NT-specific algorithm is available, the operating system must store the older LanMan hash along with the new to maintain compatibility with Windows 9x and Windows for Workgroups clients The weaker LanManager hashing algorithm has been reverse-engineered, and thus serves as the Achilles heel that allows NT s password encryption to be broken fairly trivially in most instances, depending on the password composition In fact, one of the most popular tools for cracking SAM files to reveal the passwords, L0phtcrack, is advertised as being able to crack all possible alphanumeric passwords in under 24 hours on a 450 MHz Pentium II (version 25; see http://wwwl0phtcom/ l0phtcrack/) A rant on the technical basis for the weakness of the NT hashing approach can be found at http://wwwl0phtcom/l0phtcrack/ ranthtml and is also explained later in this chapter in the Choosing Strong NT Passwords section Password cracking tools may seem like powerful decryptors, but in reality they are little more than fast, sophisticated guessing machines They precompute the password encryption algorithm on a given input (dictionary wordlist or randomly generated strings) and compare the results with a user s hashed password If the hashes match, then the password has successfully been guessed, or cracked This process is usually performed offline against a captured password file so that account lockout is not an issue and guessing can continue indefinitely Such bulk encryption is quite processor intensive, but as we ve discussed, known weaknesses like the LanMan hashing algorithm significantly speed up this process for most passwords Thus, revealing the passwords is simply a matter of CPU time and dictionary size (see http://coastcspurdueedu for sample cracking dictionaries and wordlists) Shouldn t you be auditing your passwords with tools like this Let s find out how.

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The first step in any password cracking exercise is to obtain the password file, or the SAM in the case of NT NT stores the SAM data in a file called (would you believe it ) SAM in the %systemroot%\system32\config directory that is locked as long as the OS is running The SAM file is one of the five major hives of the NT Registry, representing the physical storehouse of the data specified in the Registry key HKEY_LOCAL_MACHINE\SAM This key is not available to casual perusal, even by the Administrator account (however, with a bit of trickery and the Schedule service, it can be done see Audit Access to the SAM later in this chapter) There are four ways of getting at the SAM data: booting the target system to an alternate OS and copying the SAM file to a floppy, copying the backup of the SAM file created by the NT Repair Disk Utility, or extracting the password hashes directly from the SAM A fourth method involves eavesdropping on network username/password exchanges, which we have covered previously (see Eavesdropping on Network Password Exchange earlier in this chapter) Booting to an Alternate OS Booting to an alternate OS is as simple as creating a DOS system floppy with the copy utility on it If the target system runs on NTFS-formatted partitions, then the NTFS file-system driver called NTFSDOS from Systems Internals (http://wwwsysinternalscom/) is necessary NTFSDOS will mount any NTFS partition as a logical DOS drive, where the SAM file is ripe for the plucking Grabbing the Backup SAM from the Repair Directory Whenever the NT Repair Disk Utility (rdisk) is run with the /s argument to back up key system configuration information, a compressed copy of the SAM, called Sam_, is created in the %systemroot%\repair directory Most system administrators never bother to go back and delete this file after rdisk copies it to a floppy disk for disaster preparedness The backup SAM_ file needs to be expanded before use, as shown next (recent versions of L0phtcrack do this automatically via the Import function):.

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Node removeChild(in Node oldChild) raises(DOMException);

C:\> expand sam_ sam Microsoft (R) File Expansion Utility Version 250 Copyright (C) Microsoft Corp 1990-1994 All rights reserved Expanding sam_ to sam sam_: 4545 bytes expanded to 16384 bytes, 260% increase

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Extracting the Hashes from the SAM With Administrator access, password hashes can easily be dumped directly from the Registry into a UNIX /etc/passwd like format The original utility for accomplishing this is called pwdump, from Jeremy Allison Source code is available and Windows binaries can be found in many Internet archives Newer versions of L0phtcrack have a built-in pwdump-like feature However, neither pwdump nor L0phtcrack s utility can circumvent the SYSKEY-enhanced SAM file-encryption feature

Description: Removes the given child node from the list of children Returns: The removed node Exceptions: NO_MODIFICATION_ALLOWED_ERR Raised if this node is read-only NOT_FOUND_ERR Raised if oldChild is not a child of this node