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at public disclosure Administrative contacts, registered net blocks, and authoritative name server information is required when an organization registers a domain on the Internet However, security considerations should be employed to make the job of attackers much more difficult Many times an administrative contact will leave an organization and still be able to change the organization s domain information Thus, first ensure that the information listed in the database is accurate Update the administrative, technical, and billing contact information as necessary Furthermore, consider the phone numbers and addresses listed These can be used as a starting point for a dial-in attack or for social engineering purposes Consider using a toll-free number or a number that is not in your organization s phone exchange In addition, we have seen several organizations list a fictitious administrative contact, hoping to trip up a would-be social engineer If any employee receives an email or calls to or from the fictitious contact, it may tip off the information security department that there is a potential problem Another hazard with domain registration arises from the way that some registrars allow updates For example, the current Network Solutions implementation allows automated online changes to domain information Network Solutions authenticates the domain registrant s identity through three different methods: the FROM field in an email, a password, or via a Pretty Good Privacy (PGP) key Shockingly, the default authentication method is the FROM field via email The security implications of this authentication mechanism are prodigious Essentially, anyone can trivially forge an email address and change the information associated with your domain, better known as domain hijacking This is exactly what happened to AOL on October 16, 1998, as reported by the Washington Post Someone impersonated an AOL official and changed AOL s domain information so that all traffic was.

FIGURE 6-4

Control the settings for your individual message, asking for receipts or setting up alternate delivery options

1:

your new information more clearly Click the down arrow in the upper right-hand corner of any list and press DEL to clear the default information If you click the Manage Resources tab in Time Manager, you click New and then choose New Group to specify typical company resources: Company Car, Conference Room, or Computer Resources, for instance To add individual resources, click the Resources tab, then click New, and then click New Resource When the New Resource form appears, type its name and description, and then click OK You should take the time to include your own company resources (see Figure 6-5) These might include: n Cameras or photo equipment n Your reception area n Your archives of past publications (examples of your work) n An office laptop n Office cell phones, tape recorders, or other electronic devices

just click the Send button in the message window The message will go to your Outbox, where it will languish until either you click the Send/Receive button or a default automatic Send/Receive session is initiated by Outlook

run from the desktop or from an attachment, the access is denied Otherwise, the user is asked to confirm that the application should be allowed access to Outlook (from the Technical Details on JBF at http://wwwcigitalcom/jbf/techhtml) Cigital claims that their approach is superior, since Microsoft s Object Model Guard must protect an exhaustive list of objects if it is to be successful, a challenging task They also note that email addresses may still be exposed if they appear in signatures, message bodies, or other documents, and that future methods for exploiting flaws in Outlook to send e-mails are likely to be found By gating script-based access to Outlook/OE, JBF theoretically can prevent new attacks based on a wide range of related attack techniques The JustBeFriends DLL can be found at http://wwwcigitalcom/jbf/ We recommend it for Outlook/OE users on NT/2000 platforms JustBeFriends does not work on Win 9x platforms

To determine what kind of automatic Send/Receive settings are in place, choose Tools | Options and click the Mail Setup tab In the dialog box, click the Send/Receive button and view the Send/Receive Groups dialog box:

FIGURE 6-5

One of the most convenient features of email is the ability to attach files to messages This great timesaver has obvious drawbacks, however namely, the propensity of users to execute just about any file they receive via email No one seems to recall that this is equivalent to inviting the bad guys right into your living room Next we will discuss many attacks that leverage files attached to email messages Many revolve around mechanisms for disguising the nature of the attached file or making it irresistibly attractive to the victim s mouse-clicking finger Other attacks we discuss are much more insidious, actually writing attached files to disk without any user intervention or knowledge Most Internet users know to handle email attachments extremely carefully and with great skepticism we hope the following section strongly reinforces this concept