![]() ![]() Where the network topology is appropriate, L0phtcrack can also sniff network traffic to capture password hashes from SMB authentication sessions.Īudits can be started manually, or can be scheduled to take place on a regular basis. It can also audit passwords on the machine on which it is running. This may be practical in small organizations, but unfeasible where hundred or even thousands of machines need auditing. L0phtcrack can also accept hash files acquired in other ways: for example SAM files copied from Windows machines that have been booted into an alternative operating system from a live CD, or acquired using a locally run utility like PWDump, or a remotely run utility like fgdump. To do this, Linux machines must be running an SSH service and have an administrator level auditing account set up, and Windows machines need to be running the appropriate L0phtcrack remote agent software (either 32-bit or 64-bit) which encrypts the hash data and sends it back to the system running L0phtcrack. To make it easy for administrators, L0phtcrack can get these directly from other machines on the network remotely. L0phtcrack attempts to crack LM and NTLM password hashes from Windows machines, MD5 and DES-encoded password files from UNIX/Linux machines, and LM and NTLM challenge responses from SMB authentication sessions. Symantec withdrew the tool in 2005, but recently the company sold L0phtcrack back to the original developers, who have now released L0phtcrack 6 as a commercial product. Fortunately, L0phtcrack-a very old password auditing tool originally developed by a hacker collective and eventually bought by Symantec-is back on the market and addresses just that problem. ![]() You may well be familiar with tools such as Ophcrack and John the Ripper, which allow administrators to see if a password on a given machine is easily crackable, but few have been designed to allow a network administrator to audit a large number of machines on a network automatically. One tool to help with that is L0phtcrack. ![]() That’s why it’s important for network administrators to be able to audit the user passwords in use on their networks to ensure that they are hard to crack, regularly changed, and never re-used. ![]() Short, guessable ones that never change can not. Long, random and frequently changed passwords can help keep your corporate resources secure. ![]()
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