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- ***********************************************************************
- DDN Security Bulletin 9105 DCA DDN Defense Communications System
- 22 APR 91 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-yynn (where "yy" is the year the bulletin is issued
- and "nn" is a bulletin number, e.g. SCC:DDN-SECURITY-9001).
- **********************************************************************
-
- ALERT REGARDING MASQUERADING ACTIVITIES
-
- + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
- ! !
- ! 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. !
- ! !
- + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
-
- SCC NOTE: The practice referred to in the following advisory as
- "Social Engineering" is perhaps better known as "Masquerading."
-
-
- CA-91:04 CERT Advisory
- April 18, 1991
- Social Engineering
- ---------------------------------------------------------------------------
-
- DESCRIPTION:
-
- The Computer Emergency Response Team/Coordination Center (CERT/CC) has
- received several incident reports concerning users receiving requests
- to take an action that results in the capturing of their password. The
- request could come in the form of an e-mail message, a broadcast, or a
- telephone call. The latest ploy instructs the user to run a "test"
- program, previously installed by the intruder, which will prompt the
- user for his or her password. When the user executes the program, the
- user's name and password are e-mailed to a remote site. We are
- including an example message at the end of this advisory.
-
- These messages can appear to be from a site administrator or root. In
- reality, they may have been sent by an individual at a remote site, who
- is trying to gain access or additional access to the local machine via
- the user's account.
-
- While this advisory may seem very trivial to some experienced users,
- the fact remains that MANY users have fallen for these tricks (refer to
- CERT Advisory CA-91:03).
-
- IMPACT:
-
- An intruder can gain access to a system through the unauthorized use of
- the (possibly privileged) accounts whose passwords have been
- compromised. This problem could affect all systems, not just UNIX
- systems or systems on the Internet.
-
- SOLUTION:
-
- The CERT/CC recommends the following actions:
-
- 1) Any users receiving such a request should verify its authenticity
- with their system administrator before acting on the instructions
- within the message. If a user has received this type of
- request and actually entered a password, he/she should immediately
- change his/her password to a new one and alert the system
- administrator.
-
- 2) System administrators should check with their user communities
- to ensure that no user has followed the instructions in such
- a message. Further, the system should be carefully examined for
- damage or changes that the intruder may have caused. We also
- ask that you contact the CERT/CC.
-
- 3) The CERT/CC urges system administrators to educate their users
- so that they will not fall prey to such tricks.
-
- ---------------------------------------------------------------------------
- SAMPLE MESSAGE as received by the CERT (including spelling errors, etc.)
-
- OmniCore is experimenting in online - high resolution graphics
- display on the UNIX BSD 4.3 system and it's derivitaves. But, we
- need you're help in testing our new product - TurboTetris.
- So, if you are not to busy, please try out the ttetris game in your
- machine's /tmp directory. just type:
-
- /tmp/ttetris
-
- Because of the graphics handling and screen-reinitialazation, you will
- be prompted to log on again. Please do so, and use your real password.
- Thanks you for your support. You'll be hearing from us soon!
-
-
- OmniCore
-
- END OF SAMPLE MESSAGE
- ---------------------------------------------------------------------------
-
- If you believe that your system has been compromised, contact CERT/CC via
- telephone or e-mail.
-
- Computer Emergency Response Team/Coordination Center (CERT/CC)
- Software Engineering Institute
- Carnegie Mellon University
- Pittsburgh, PA 15213-3890
-
- Internet E-mail: cert@cert.sei.cmu.edu
- Telephone: 412-268-7090 24-hour hotline:
- CERT/CC personnel answer 7:30a.m.-6:00p.m. EST,
- on call for emergencies during other hours.
-
- Past advisories and other computer security related information are available
- for anonymous ftp from the cert.sei.cmu.edu (128.237.253.5) system.
-
-
-