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 18.104.22.168-170.2.35.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 22.214.171.124-170.2.35.fc10.x86_64 on an x86_64 (1)
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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.