Pete Finnigan's Oracle Security Weblog

vonjeek from The hackers Choice has updated his Oracle password cracker to include the 11g password hashes and to use the 11g SHA1 password algorithm. The cracker also takes advantage of the fact that 11g keeps the old DES based/derived hash in the same place as the new SHA-1 hash. The THC 11g Password cracker is shown below in action for a sample password:



The password cracker exploits the fact that the old DES hash is stored. Therefore the upper case version of a password can be cracked first. If the password guessed generates a hash that matches that stored in the SYS.USER$.PASSWORD column then a further attack can be made on the SHA-1 hash to determine the case sensitive version of the password. This reduces the number of guesses necessary. As you can see the tool is graphically based and does a test based on user=pwd, dictionary attack then a brute force attack using the old DES based hash first. The readme is shown below:



explains how the cracker works. Nice tool!!