Red Hat Bugzilla – Bug 57589
running up2date breaks ftp
Last modified: 2007-04-18 12:38:45 EDT
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Description of problem:
After running up2date under RH 7.2 ftp no longer works. I get
"invalid login" every time I try, yet I can login using telnet.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Run up2date under RH 7.2
2.Run ftp localhost
3.Try to login using your username/password
Actual Results: Login failed
Expected Results: Login successful
up2date can be hazardous to RH Linux
Turns out I installed the PD Korn shell in /bin/ksh, but did not put this
into /etc/shells. This caused wu-ftpd to return "invalid login" for any user
who selected this as his/hre default shell.
This is a bug in wu-ftpd: it should say "unknown shell" or something more
helpful than "invalid login".
No, it's not a bug in wu-ftpd. It's a security feature.
If a cracker is told why he can't log in as a specific user, he'll have a much
better chance at circumventing it ("oh, this user must exist!").