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[bug-inetutils] Problems with telnetd in inetutils-1.9.4

From: Michael Brunnbauer
Subject: [bug-inetutils] Problems with telnetd in inetutils-1.9.4
Date: Thu, 28 Apr 2016 18:17:56 +0200
User-agent: Mutt/1.6.0 (2016-04-01)

hi all,

I recently upgraded a Linux system of a customer (Kernel 3.4.111) to 
glibc-2.23, which caused inetd + telnetd from inetutils-1.9.1 to break:

 inetd[24051]: cannot execute /usr/libexec/telnetd: Bad address

The inetd.conf entry for this is:

 telnet  stream  tcp4    nowait  root    /usr/libexec/telnetd

Other services handled with inetd still seem to work fine. Recompiling inetd and
telnetd did not help. I upgraded to inetutils-1.9.4, which fixed this problem
but created another one:

telnet displays the banner and asks for a password without asking for a login.
If I enter a non-password, a failed login attempt for root is logged in the 
system. The telnet option -K does not change anything. Using the old telnetd
binary with the new inetd works fine (the login is asked first).

The customer is doing automatic telnet logins from an app and these also fail
so I have reason to suspect that the problem lies in the new telnetd server and 
not the telnet client.

I compared the call of /bin/login from the old and the new telnetd binary.
The command line is /bin/login -p -h <hostname> in both cases and the 
environment is identical.

Is this a bug in telnetd?


++  Michael Brunnbauer
++  netEstate GmbH
++  Geisenhausener Straße 11a
++  81379 München
++  Tel +49 89 32 19 77 80
++  Fax +49 89 32 19 77 89 
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