Red Hat Bugzilla – Bug 497875
Avoid entering empty Login to open a telnet/ssh session
Last modified: 2010-01-06 05:56:55 EST
Description of problem:
If user telnet to remote host and doesn't provide a login name, just hit answer, password string with prompt instead of login again
Version-Release : Linux 220.127.116.11-170.2.35.fc10.x86_64 #1 SMP Mon Feb 23 13:00:23 EST 2009 x86_64 x86_64 x86_64 GNU/Linux
if the login: answer is blank(just return)
************FreeBSD response to enter *********
*********Fedora response to enter *********
Fedora release 10 (Cambridge)
Kernel 18.104.22.168-170.2.35.fc10.x86_64 on an x86_64 (1)
This message is a reminder that Fedora 10 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
and issuing updates for Fedora 10. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as WONTFIX if it remains open with a Fedora
'version' of '10'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version'
to a later Fedora version prior to Fedora 10's end of life.
Bug Reporter: Thank you for reporting this issue and we are sorry that
we may not be able to fix it before Fedora 10 is end of life. If you
would still like to see this bug fixed and are able to reproduce it
against a later version of Fedora please change the 'version' of this
bug to the applicable version. If you are unable to change the version,
please add a comment here and someone will do it for you.
Although we aim to fix as many bugs as possible during every release's
lifetime, sometimes those efforts are overtaken by events. Often a
more recent Fedora release includes newer upstream software that fixes
bugs or makes them obsolete.
The process we are following is described here:
Fedora 10 changed to end-of-life (EOL) status on 2009-12-17. Fedora 10 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.
If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version.
Thank you for reporting this bug and we are sorry it could not be fixed.
This problem still exists, reopening.
After inspection (thanks to Jan Gorig) problem is in the /bin/login utility. Telnet uses it for user authentication.
Fedora /bin/login behavior:
BSD login behavior:
Reassigning to util-linux-ng for further inspection.
The username is optional. For example PAM is able read username from some external source (e.g. smartcard). The login(1) cares about complete authentication only.