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- Security Bulletin 9225 DISA Defense Communications System
- October 7, 1992 Published by: DDN Security Coordination Center
- (SCC@NIC.DDN.MIL) 1-(800) 365-3642
-
- DEFENSE DATA NETWORK
- SECURITY BULLETIN
-
- The DDN SECURITY BULLETIN is distributed by the DDN SCC (Security
- Coordination Center) under DISA contract as a means of communicating
- information on network and host security exposures, fixes, and concerns
- to security and management personnel at DDN facilities. Back issues may
- be obtained via FTP (or Kermit) from NIC.DDN.MIL [192.112.36.5]
- using login="anonymous" and password="guest". The bulletin pathname is
- scc/ddn-security-yynn (where "yy" is the year the bulletin is issued
- and "nn" is a bulletin number, e.g. scc/ddn-security-9225).
-
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-
- TAC Access Control Policy Circular Announcement
-
- A circular describing TAC Access and related policies will soon
- be released in conjunction with the release of DDN Management
- Bulletin #101, which describes MILNET TAC user validation and
- registration. This circular will define the areas of respon-
- sibility for procuring TAC Access and make public the official
- policies and procedures regarding the administration, processing,
- validation and distribution of MILNET TAC Access Cards.
-
- The "TAC Access Control Policy Circular" will apply to all
- Service and Agency host and gateway administrators who are
- authorized to submit requests for TAC Cards. The circular will
- be provided to other addresses for general information and
- guidance.
-
- The Circular will consist of seven parts each of which will
- describe the various aspects of TAC Access in detail. Among
- those topics discussed will be the following:
-
- * policies for authorization and administration
- of network access via a TAC,
-
- * procedures for ensuring network security and
- preventing unauthorized TAC Access,
-
- * proper procedures for using TAC Access Cards,
-
- * a description of the re-registration process and
- its function relative to TAC Card issuance,
-
- * updated policies and procedures related to
- quarterly Guest TAC Cards.
-
- In addition to the information outlined in this Circular,
- please refer to the following DDN Management Bulletins for
- further discussion of procedures and policies relating to
- TAC Usage and TAC Card issuance:
-
- * DDN Management Bulletin #37, 16 Dec 87, DDN Node Site
- Coordinator (NSC) and Host Administrator Duties
-
- * DDN Management Bulletin #94, 16 Mar 92, MILNET/NIC
- Re-registration Schedule and TAC Card Expiration
-
- * DDN Management Bulletin #101, 24 Sep 92, MILNET TAC
- User Validation and Registration
-
- All gateways,concentrators, or routers that are directly
- attached to the MILNET (i.e., those that have a 26 network
- address) have designated administrators that are registered
- with the NIC. These administrators have primary responsibility
- for requesting/authorizing TAC Access Cards. The gateway admini-
- istrators have the option of delegating this authority to the host
- administrators of systems that access MILNET via their gateways.
- These host administrators must also be registered with the NIC.
- Users applying for TAC access cards must contact their local host
- administrators or the NIC to determine the required signature
- authority for their site.
-
- Hosts that are directly connected to MILNET (those that have a
- network address of 26) also have designated administrators that
- must be registered with the NIC. These host administrators have the
- authority to request TAC access cards. However, some MILNET hosts
- that are currently direct-connected are being disconnected and
- moved behind gateways/concentrators. The administrators of such hosts
- must be delegated the authority to request TAC access cards by the
- administrator of the gateway that provides their connection to
- MILNET (in accordance with the Draft TAC Access Control Policy
- Circular).
-
- This delegation of authority will allow administrators of hosts
- behind gateways/concentrators to register their users to their local
- hosts and to request TAC Access Cards for them. Users of hosts that
- have moved behind gateways must be re-registered so that they will
- appear in the NIC database as associated with the correct host and
- gateway. Therefore, all administrators of hosts moving behind gateways
- MUST coordinate with the administrator of their gateway/concentrator
- and with the DDN NIC Registrar to arrange the re-registration of
- their TAC users BEFORE the host on which they are currently registered
- is disconnected.
-
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- * *
- * The point of contact for MILNET security-related incidents is the *
- * Security Coordination Center (SCC). *
- * *
- * E-mail address: SCC@NIC.DDN.MIL *
- * *
- * Telephone: 1-(800)-365-3642 *
- * *
- * NIC Help Desk personnel are available from 7:00 a.m.-7:00 p.m. EST, *
- * Monday through Friday except on federal holidays. *
- * *
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-