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U chknull Countermeasure vulnerability is simple, but, depending on your enThe countermeasure to the chknull
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vironment, may be difficult to execute Any of the following steps will counteract the chknull exploit: M Remove bindery context from your NetWare 4x servers Edit your autoexecncf file, and remove the SET BINDERY line Remember that this step may break any older NETX or VLM clients that may depend on bindery context to log in Define and enforce a corporate policy regarding strong password usage Change and use a USER_TEMPLATE to require a password with at least six characters Remove browse tree capability (see 3) Turn on Intrusion Detection Right-click each Organizational Unit and perform the following: 1 Select Details 2 Select the Intrusion Detection tab, and check mark the boxes for Detect Intruders and Lock Account After Detection Change the parameters to match our recommendations in the table presented in the Nwpcrack Countermeasure section, later in this chapter
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So you discovered how much information your servers are coughing up Are you nervous yet No Well, attackers can gain even more information by authenticating After gaining a set of usernames and passwords from the previous chknull demonstration, attackers will try to log in to a server using either the DOS program loginexe, On-Site, or the Client32 login program Once authenticated, they can gain even more information using a previously introduced tool (On-Site) and new utilities (userlist and NDSsnoop)
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Popularity: Simplicity: Impact: Risk Rating: 9 10 4 7
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Hacking Exposed: Network Security Secrets and Solutions
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The userlist tool doesn t work with just an attachment, so you can use a valid username and password gained with the chknull utility Userlist, shown next, is similar to the On-Site tool, but it s in command-line format, which means it is easily scripted
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Userlist provides important information to the attacker, including complete network and node address, and login time
On-Site Administrator
With authenticated access to a NetWare server, you can use On-Site again, now to view all current connections to the server Simply select the server with the mouse, and then select the Analyze button You ll not only get basic volume information, but all current connections also will be displayed, as shown in Figure 7-4 With an authenticated On-Site session you can view every NetWare connection on the system This information is important to attackers and can help them gain Administrator access, as we ll see later on
NDSsnoop
Your mileage may vary greatly with NDSsnoop, but if you can get it working, it will help you Once authenticated to the tree, NDSsnoop can be used to graphically view all object and property details (similar to the nlist /ot=* /dyn /d command discussed earlier), including the equivalent to me property As Figure 7-5 shows, you can use NDSsnoop to view vital information about objects in your tree, including last login time and equivalent to me, the brass ring for an attacker
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Novell NetWare Hacking
Figure 7-4
The connection information offered with On-Site will be helpful in gaining Admin rights later on
Detecting Intruder Lockout
Popularity: Simplicity: Impact: Risk Rating: 6 9 6 7
Intruder Lockout is a feature built in to NetWare that will lock out any user after a set number of failed attempts Unfortunately, by default NetWare Intruder Lockout is not turned on The feature is enormously important in rejecting an attacker s attempts to gain
Hacking Exposed: Network Security Secrets and Solutions
Figure 7-5
With the NDSsnoop utility you can view details about each object, sometimes including who is equivalent to Admin
access to the server and should always be turned on When enabling intruder lockout, as shown in Figure 7-6, be sure to make the change on every container in your tree that allows user authentication Once attackers have targeted a specific user to attack, they usually try to determine whether intruder lockout is enabled If so, they orient their attacks to stay under its radar (so to speak) You d be surprised how many administrators do not employ intruder lockout, maybe due to a lack of knowledge or to a misunderstanding about its importance, or
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