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37 lines
1.7 KiB
Plaintext
37 lines
1.7 KiB
Plaintext
@(#) BLURB 1.28 97/03/21 19:27:18
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With this package you can monitor and filter incoming requests for the
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SYSTAT, FINGER, FTP, TELNET, RLOGIN, RSH, EXEC, TFTP, TALK, and other
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network services.
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The package provides tiny daemon wrapper programs that can be installed
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without any changes to existing software or to existing configuration
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files. The wrappers report the name of the client host and of the
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requested service; the wrappers do not exchange information with the
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client or server applications, and impose no overhead on the actual
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conversation between the client and server applications.
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This patch upgrades the tcp wrappers version 7.5 source code to
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version 7.6. The source-routing protection in version 7.5 was not
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as strong as it could be. And all this effort was not needed with
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modern UNIX systems that can already stop source-routed traffic in
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the kernel. Examples are 4.4BSD derivatives, Solaris 2.x, and Linux.
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This release does not introduce new features. Do not bother applying
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this patch when you built your version 7.x tcp wrapper without
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enabling the KILL_IP_OPTIONS compiler switch; when you can disable
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IP source routing options in the kernel; when you run a UNIX version
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that pre-dates 4.4BSD, such as SunOS 4. Such systems are unable to
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receive source-routed connections and are therefore not vulnerable
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to IP spoofing attacks with source-routed TCP connections.
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A complete change log is given in the CHANGES document. As always,
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problem reports and suggestions for improvement are welcome.
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Wietse Venema (wietse@wzv.win.tue.nl),
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Department of Mathematics and Computing Science,
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Eindhoven University of Technology,
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The Netherlands.
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Currently visiting IBM T.J. Watson Research, Hawthorne NY, USA.
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