Bug 497875 - Avoid entering empty Login to open a telnet/ssh session
Avoid entering empty Login to open a telnet/ssh session
Product: Fedora
Classification: Fedora
Component: util-linux-ng (Show other bugs)
All Linux
low Severity low
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Assigned To: Karel Zak
Fedora Extras Quality Assurance
: Reopened
Depends On:
  Show dependency treegraph
Reported: 2009-04-27 13:05 EDT by Rabie K
Modified: 2010-01-06 05:56 EST (History)
3 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2010-01-06 05:56:55 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Rabie K 2009-04-27 13:05:29 EDT
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 #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 *********
FreeBSD/i386 (ttyp0)


*********Fedora response to enter *********
Fedora release 10 (Cambridge)
Kernel on an x86_64 (1)
Login incorrect

Login incorrect
Comment 1 Bug Zapper 2009-11-18 07:51:02 EST
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bug reports from releases that are no longer maintained.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
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to a later Fedora version prior to Fedora 10's end of life.

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Comment 2 Bug Zapper 2009-12-18 04:22:10 EST
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no longer maintained, which means that it will not receive any further 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.
Comment 3 Adam Tkac 2009-12-21 03:23:39 EST
This problem still exists, reopening.
Comment 4 Adam Tkac 2010-01-06 04:41:48 EST
After inspection (thanks to Jan Gorig) problem is in the /bin/login utility. Telnet uses it for user authentication.

Fedora /bin/login behavior:

$ login 

Login incorrect

BSD login behavior:

$ login

Reassigning to util-linux-ng for further inspection.
Comment 5 Karel Zak 2010-01-06 05:56:55 EST
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.


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