IT Baseline Protection Manual - The Information Warfare Site

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Safeguard Catalogue - Communications Remarks ____________________________________________________________________ ......................................... S 5.21 Secure use of telnet, ftp, tftp and rexec Initiation responsibility: IT Security Management, Administrators Implementation responsibility: Administrators With the telnet hostname command it is possible to log into the hostname computer after entry of a user name and associated password. With ftp, sizeable quantities of data can be copied, and rexec allows execution of a command on another computer without previously logging on. For all of these three programs, the entered user names and passwords are transmitted unencrypted over the network; so they should only be used when one can be certain that the network cannot be intercepted (cf. T 5.7). All calls to telnet, ftp and rexec must be logged. Particular attention must be paid to unsuccessful connection attempts by external IT systems. When using the ftpd daemon, it must be borne in mind that, as in the case of sendmail (cf. S 5.19 Use of the sendmail security mechanisms), new, serious security flaws are constantly coming to light which may make it possible to gain Administrator privileges without a password (on this point, see CERT notice CA-94-08. 14 April 1994). ftp versions that are older than those described there should not be used. In addition, all user names for which ftp access is not to be permitted should be entered in the /etc/ftpusers file. These include, for example, root, uucp and bin. When configuring new users, care should be taken to ensure that these are entered in /etc/ftpusers if their profile does not permit them any ftp access (see also S 2.30 Provisions governing the configuration of users and user groups). With .netrc-files, automatic FTP accesses to remote IT systems are permitted as .netrc files contain the necessary passwords. Steps must therefore be taken to ensure that there are no .netrc-files in the user directories or else that they are empty and the user is unable to access them. Use of the tftpd, rexd and rexecd daemons must be prevented (e.g. by deleting the corresponding entry in /etc/inetd.conf) or, as a minimum, steps must be taken to ensure that, when using tftp, users only have restricted access to files from the log-in directory (see also S 2.32 Establishment of a restricted user environment). This can be verified by making the following entries: tftp hostname tftp>get /etc/passwd /tmp/txt If the tftp daemon does not respond with an error message, its use must be prevented. If notwithstanding tftp is still used for the start-up process of active network components or X terminals, it is essential that this is documented and the underlying rationale is explained. Again, if tftp is used, steps must be taken to ensure that the tftp daemon is started with the option –s directory. The directory entered here must be the only directory which is visible to the daemon. Secure Shell (ssh) can be used as a substitute for telnet and rexec. It makes use of extensive functions designed to ensure secure authentication and to ____________________________________________________________________ ......................................... IT-Baseline Protection Manual: Oktober 2000 Passwords in plain text Security weaknesses in ftpd Restrict ftp access Restricted file access with tftp Use Secure Shell as a substitute
Safeguard Catalogue - Communications Remarks ____________________________________________________________________ ......................................... maintain confidentiality and integrity (see also S 5.64 Use of Secure Shell). It is also possible using tunnelling to operate ftp with secure encryption. If ssh is used, then if possible these services should be disabled to ensure that the security safeguards cannot be circumvented. However, this presupposes that all communication partners have suitable implementations of ssh. Additional controls: - Is the /etc/ftpusers file updated regularly? - Are access attempts via telnet, ftp and rexec logged? - Is ssh used to provide protection? - Is tftp disabled? ____________________________________________________________________ ......................................... IT-Baseline Protection Manual: Oktober 2000
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