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There is a brand new remote FreeBSD vulnerability in telnetd in all its versions starting from version 7 to 9. It is therefore advisable that the telnet daemon be completely disabled.

To disable telnetd on FreeBSD:

1. Open /etc/inetd.conf

freebsd# vi /etc/inetd.conf


2. Comment out the line

telnet stream tcp nowait root /usr/libexec/telnetd telnetd


e.g.:

#telnet stream tcp nowait root /usr/libexec/telnetd telnetd


3. Restart inetd

freebsd# /etc/rc.d/inetd restart


The whole remote root telnetd FreeBSD security advisory (SA), can be read here

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Tags: brand, Comment, conf, daemon, freebsd, freebsd security, inetd, libexec, line, line telnet, nowait, Restart, root, security, security advisory, stream, tcp, Telnet, telnetd, usr, version, vulnerability

This entry was posted on Sunday, December 25th, 2011 at 2:26 pm and is filed under Computer Security, FreeBSD, System Administration. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.