Mark Shtern. Passwords are the most common authentication method They are inherently insecure.

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Presentation transcript:

Mark Shtern

Passwords are the most common authentication method They are inherently insecure

Human generated passwords Come from a small domain Easy to guess – dictionary attacks Stronger passwords Computer generated or verified Not user friendly Hard to remember

Physical Access Offline password cracking Online password cracking

Boot using Linux bootable CD Mount system drive Reset Administration Password (Windows: chntpwd; Linux modify shadow file)

Collect password hashes Crack passwords

Eavesdropping (Sniffing) Password file  Windows – SAM,NTDS.dit file (pwdump[ 2-6 ] and fgdump)  Linux – shadow file (unshadow) Memory Dump (debug tools: WinDgb, gdb), System calls (APImonitor, strace) SQL database, configuration file Source code

Types  Brute Force  Dictionary  Hybrid  Rainbow The most popular crackers  Windows: Ophcrack, Cain & Abel, LCP  Linux: John the Ripper (john)

Eavesdropping: Encrypt the channel, e.g. using SSL or SSH Offline dictionary attacks: Limit access to password hashes, strong passwords, password lifetime, use salt Online dictionary attacks: Delayed answers, strong passwords, account lockouts

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