[Bug 414359] Re: Dovecot-imapd, PAM auth., krb auth with non-krb user causes crash

[A. Karl Kornel]

Hello again!

I've got another twist on this bug!  Last night, I tried logging into a
machine that is showing this problem.  I was logging in using SSH, using
the PuTTY Windows SSH client.  At the time I made the connection, I
entered the wrong username by mistake, but I did not catch my mistake
until I had finished entering my password.  After entering the password,
PuTTY just sat for a while, waiting, and then reported that the remote
side had closed the connection.

Once I got back into work, I did a test with this on my workstation
(also running Ubuntu Hardy, fully up-to-date), and I discovered the
following:  If you have PAM configured to use Heimdal's pam_krb5.so
module, and you try to log in with an invalid username, openssh-server's
sshd will crash in the same place as dovecot-imapd.

Since I did the verification on my Linux workstation, I had apport
running, and it grabbed a crash report.  I processed the crash report
with `appport-cli -c` and saved the report, so it has the core dump AND
all of the information that is derived from the core dump.  I really
hope this extra info helps!

** Attachment added: "usr_sbin_sshd.0.crash"
   http://launchpadlibrarian.net/35196951/usr_sbin_sshd.0.crash

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Dovecot-imapd, PAM auth., krb auth with non-krb user causes crash
https://bugs.launchpad.net/bugs/414359
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