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- *** CuD #3.14: File 4 of 6: CERT Advisory ***
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- 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 derivatives [sic].
- 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-reinitialization
- [sic], 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
-
- 412-268-7090 24-hour hotline: CERT/CC personnel answer
- 7:30a.m.-6:00p.m. EST, on call for emergencies during other hours.
- E-mail: cert@cert.sei.cmu.edu
-
- Past advisories and other computer security related information are
- available for anonymous ftp from the cert.sei.cmu.edu (128.237.253.5)
- system.
-
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