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Hacking Exposed: Network Security Secrets and Solutions
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Back Doors
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The most effective back door for Novell is the one they teach you to never perform yourself orphaned objects Using a hidden Organizational Unit (OU) with an Admin equivalent user with trustee rights for its own container will effectively hide the object 1 Log in to the tree as Admin or equivalent 2 Start the NetWare Administrator (nwadmn3xexe) 3 Create a new container in a deep context within the tree Right-click an existing OU, and create a new OU by selecting Create and choosing an Organizational Unit 4 Create a user within this container Right-click the new container, select Create, and choose User 5 Give the user full Trustee Rights to his or her own object Right-click the new user, and select Trustees Of This Object Now make that user an explicit trustee 6 Give this user full Trustee Rights to the new container Right-click the new container, and select Trustee Of This Object Make the user an explicit trustee of the new container by checking all of the available properties, as shown in the following illustration
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Novell NetWare Hacking
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7 Modify the user to make his or her security equivalent to Admin Right-click the user, select Details, select the Security Equivalent To tab, select Add, and select Admin 8 Modify the Inherited Right Filter on the container to disallow Browse and Supervisor capabilities Be careful, however, as this action (step 8) will make the container and your new user invisible to everyone, including Admin Administrators on the system will be unable to view or delete this object Hiding an NDS object from Admin is possible because NDS allows a supervisor to be restricted from an object or property 9 Now log in through the back door Remember, you will not be able to browse the new container in the tree Consequently, you ll need to manually input the context when you log in, as shown in the following illustration
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For more information, check out NMRC s site (http://wwwnmrcorg) Simple Nomad details this technique in his Unofficial Hack FAQ at http://wwwnmrcorg/faqs/hackfaq/ hackfaqhtml
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Countermeasure U Backdoorbackdoor countermeasures are available, one freeware and one commercial A couple of
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The commercial solution to finding hidden objects is BindView EMS/NOSadmin 4x & 5x v6 (http://wwwbindviewcom) The product can find all hidden objects The freeware solution is the Hidden Object Locator product located at http:// wwwnetwarefilescom/utils/hobjloczip The product runs as an NLM on the server and scans your NDS tree for objects that don t have browse rights for the logged-in user
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Hacking Exposed: Network Security Secrets and Solutions
(usually Admin) The product s small footprint (87K) and low price (free) make it a great solution The only Novell solution is from an auditing perspective Using SYS:PUBLIC\ AUDITCON, you can enable auditing by the Grant Trustee event: 1 Start auditcon 2 Select Audit Directory Services 3 Select Audit Directory Tree 4 Select the container to audit, and then press F10 5 Select Enable Container Auditing 6 Press ESC until you reach the main menu 7 Select Enable Volume Auditing 8 Select Auditing Configuration 9 Select Audit By Event 10 Select Audit By User Events 11 Toggle Grant Trustee on Of course, this solution assumes that attackers are not smart enough to turn auditing off before creating the back door
FURTHER RESOURCES
Web Sites (ftp://ftpnovellcom/pub/updates/nw/nw411/)
Novell s own FTP server is the home for a variety of applications you can use to secure your servers Some other sites to check out are http://developernovellcom/research/topical/securityhtm http://netlab1usuedu/novellfaq/nov-faqhtm http://wwwfutureonecom/~opeth/freedoshtm http://wwwfutureonecom/~opeth/nwutilshtm http://home1swipnetse/~w-12702/11Anovelhtm http://attackersclubcom/km/files/novell/indexhtml http://wwwnwconnectioncom/ http://wwwbindviewcom
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Novell NetWare Hacking
Usenet Groups
composnetwaremisc composnetwareannounce composnetwaresecurity composnetwareconnectivity
SUMMARY
Despite Novell s long history of providing solid network operating systems, their attention to security details has been a shortcoming We showed you how simple it was to attack a NetWare server, gain user-level access, and then gain Admin access to both the server and the tree We demonstrated misconfiguration exploits, application design flaws, and application exploits allowing an attacker to gain complete control of your entire NDS tree Each of the vulnerabilities discussed had an associated countermeasure, and many of these were no more than one step each The fixes are simple and yet most administrators don t know how important it is to apply them
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