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- ***********************************************************************
- DDN Security Bulletin 90-08 DCA DDN Defense Communications System
- 7 May 90 Published by: DDN Security Coordination Center
- (SCC@NIC.DDN.MIL) (800) 235-3155
-
- DEFENSE DATA NETWORK
- SECURITY BULLETIN
-
- The DDN SECURITY BULLETIN is distributed by the DDN SCC (Security
- Coordination Center) under DCA contract as a means of communicating
- information on network and host security exposures, fixes, & concerns
- to security & management personnel at DDN facilities. Back issues may
- be obtained via FTP (or Kermit) from NIC.DDN.MIL [192.67.67.20]
- using login="anonymous" and password="guest". The bulletin pathname is
- SCC:DDN-SECURITY-yy-nn (where "yy" is the year the bulletin is issued
- and "nn" is a bulletin number, e.g. SCC:DDN-SECURITY-90-01).
- **********************************************************************
-
- UNISYS U5000 /etc/passwd PROBLEM
-
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- ! !
- ! The following important advisory was issued by the Computer !
- ! Emergency Response Team (CERT) and is being relayed unedited !
- ! via the Defense Communications Agency's Security Coordination !
- ! Center distribution system as a means of providing DDN !
- ! subscribers with useful security information. !
- ! !
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-
- CA-90-03 CERT Advisory
- May 7, 1990
- Unisys U5000 /etc/passwd problem
-
-
- The CERT/CC has recently verified several reports of unauthorized access
- to Internet connected Unisys systems. The intruder(s) gained access to
- these systems by logging into vendor supplied default accounts; accounts
- that had not been given passwords by the systems' owners.
-
- Gary Garb, Corporate Computer Security Officer for Unisys Corporation,
- states:
-
- "The Unisys U5000 series UNIX systems are delivered with a number of
- system logins. The logins are NOT password protected when the
- customer receives the system. Unless the customer secures these logins,
- the system is vulnerable to unauthorized access."
-
- "A complete list of these logins can be found in the /etc/passwd file.
- Each login is described by one record in /etc/passwd which contains a
- number of fields separated by colons. The second field normally would
- contain the encrypted password. The system logins will initially have
- a null second field (indicated by two adjacent colons) in their descriptive
- records in /etc/passwd."
-
- "The U5000/80/85/90/95 System V Administration Guide, Volume 1 (UP13679)
- begins with a chapter on "System Identification and Security". On page 1-2
- it states, "All logins should have passwords ... Logins that are not needed
- should be either removed (by deleting from /etc/passwd) or blocked (by
- locking the login as described in the section "Locking Unused Logins" on
- page 1-8). The Guide contains complete instructions on controlling logins
- and passwords."
-
- "It is the user's (system administrator's) responsibility to thoroughly
- read the Guide and to ensure the security of the system. *Securing the
- login entries should be of the highest priority and should be accomplished
- before anyone else has access to the system.*"
-
- The CERT/CC urges administrators of Unisys systems, as well as administrators
- of systems provided by other vendors, to check their systems and insure all
- accounts are protected by passwords; passwords that are different from the
- default passwords provided by the vendor.
-
- Questions regarding the security aspects of Unisys systems should be directed
- to:
- Gary Garb, Corporate Security Officer
- Unisys Corporation
- (215) 986-4038
-
- -------
- Dan Farmer
- Computer Emergency Response Team (CERT)
- Software Engineering Institute
- Carnegie Mellon University
- Pittsburgh, PA 15213-3890
-
- Internet: cert@cert.sei.cmu.edu
- Telephone: 412-268-7090 24-hour hotline: CERT personnel answer
- 7:30a.m.-6:00p.m. EST, on call for
- emergencies other hours.
-
- Past advisories and other information are available for anonymous ftp
- From cert.sei.cmu.edu (128.237.253.50).
-
-
-