Erinevus lehekülje "Itx8071-task2" redaktsioonide vahel

Redaktsioon: 26. august 2015, kell 19:32

To be announced.

@@ 1. rida: / 1. rida: @@
-This homework assignment requires the knowledge from Modules 6 and 7.
+To be announced.
-Create SEC rules that accomplish the following event correlation task:
-) monitor sshd log events and detect SSH probing from remote hosts, where
-the same non-existing user account is probed over SSH from 3 distinct IP
-addresses within 60 seconds or less.
-For example, if the following events appear in the log
-  Nov  7 12:53:11 myhost sshd[10477]: Failed password for invalid user admin2 from 10.3.6.22 port 50087 ssh2
-  Nov  7 12:53:12 myhost sshd[10477]: Failed password for invalid user admin2 from 10.3.6.22 port 50087 ssh2
-  Nov  7 12:53:39 myhost sshd[10479]: Failed password for invalid user oracle from 10.3.6.24 port 9899 ssh2
-  Nov  7 12:53:40 myhost sshd[10479]: Failed password for invalid user oracle from 10.3.6.24 port 9899 ssh2
-  Nov  7 12:54:01 myhost sshd[10527]: Failed publickey for invalid user admin2 from 10.1.2.52 port 40106 ssh2
-  Nov  7 12:54:02 myhost sshd[10527]: Failed publickey for invalid user admin2 from 10.1.2.52 port 40106 ssh2
-  Nov  7 12:54:07 myhost sshd[10543]: Failed password for invalid user admin2 from 10.17.8.9 port 32444 ssh2''
-your SEC rule(s) should detect SSH probing for non-existing use admin2, since
-this user was probed between 12:53:11 and 12:54:07 from 3 distinct IP addresses
-.3.6.22, 10.1.2.52 and 10.17.8.9.
-Also note that the detection should be done with a sliding window approach --
-if the counting operation for some non-existing user has not seen enough events
-during 60 seconds, the 60 second detection window should be moved forward.
-) if the previous condition has been detected for 3 distinct non-existing users
-during 900 seconds (for example, admin2, oracle and testuser3 have been probed
-within 900 seconds), report this event to the local root-user via e-mail. After
-an e-mail has been sent, ensure than no repeated e-mails are generated during
-the following 3600 seconds.
-Some hints for accomplishing this assignment:
-* don't try to solve the whole assignment with just one rule, but rather write several rules which interact,
-* if SSH probing for some non-existing user account is detected (as described in the first subtask), you could generate a relevant synthetic event for this user, in order to provide input for further event correlation rules.
-Apart from studying the examples from the course slides, have a look at the SEC
-man page (installed at the virtual machines or found at
-http://simple-evcorr.sourceforge.net/man.html).

Erinevus lehekülje "Itx8071-task2" redaktsioonide vahel

Redaktsioon: 26. august 2015, kell 19:32

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