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FWD: Caution! Significant increase in probes reported by FBI
FYI Bob Ashworth
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From: "Linux Tips at TechRepublic.com" <TechRepublic#1.1553.dd-91qWlzXK3b0m.1@techmail.techrepublic.com>
Date: Fri, 22 Jun 2001 05:09:08 -0400 (EDT)
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Today's Linux tip
CAUTION! SIGNIFICANT INCREASE IN PROBES REPORTED BY FBI
In early May 2001, the U.S. Federal Bureau of Investigation (FBI)
warned of a "significant increase" in malicious, automated probes of
UNIX and UNIX-like systems, including Linux. The probes are searching
for systems that have vulnerable versions of LPRng, the "Next
Generation" version of the widely used LPR printing utility, as well
as the RPC daemon used with Network File System (NFS) services. While a
large portion of these attacks were the result of U.S./Chinese
cyberskirmishes following the downing of a U.S. spy plane, the
subsequent hacking traffic has not died down. Check your software
distribution's home page for an updated version of LPRng and RPC, and
do so without delay!
Remember that automated probes are looking for TCP/IP listening ports
that are associated with known system weaknesses. Make sure that you're
running your Linux system with all ports disabled; save the ones that
you absolutely need. In a terminal window, switch to superuser status,
open /etc/inetd.conf, and comment out ports you're not using (for a
single-user system that isn't functioning as a server, likely
candidates include anonymous FTP, POP3, Telnet, rlogin, and rcp). For
more information, see the Linux Security HOWTO.
http://www.linuxdoc.org/HOWTO/Security-HOWTO-8.html
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