Date: Tue, 13 Mar 2001 13:27:19 -0500 (EST) From: Rob Simmons <rsimmons@duckman.wlcg.com> To: FreeBSD-gnats-submit@freebsd.org Subject: bin/25778: sshd core after login attempt for non-existant user Message-ID: <200103131827.f2DIRJ271873@duckman.wlcg.com>
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>Number: 25778
>Category: bin
>Synopsis: sshd core after login attempt for non-existant user
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Mar 13 10:40:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: Rob Simmons
>Release: FreeBSD 4.2-STABLE i386
>Organization:
Westlake
>Environment:
FreeBSD duckman 4.2-STABLE FreeBSD 4.2-STABLE #1: Fri Feb 16 11:57:35 EST 2001 acundari@duckman:/usr/obj/usr/src/sys/DUCKMAN i386
>Description:
When someone tries to login with a username that does not exist, sshd dumps core. Here is the gdb output from the core file, followed by the ident info from the sshd binary:
su-2.04# gdb /usr/sbin/sshd sshd.core
GNU gdb 4.18
Copyright 1998 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-unknown-freebsd"...
(no debugging symbols found)...
Core was generated by `sshd'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib/libopie.so.2...(no debugging symbols found)...
done.
Reading symbols from /usr/lib/libmd.so.2...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libcrypt.so.2...(no debugging symbols found)...
done.
Reading symbols from /usr/lib/libcrypto.so.1...(no debugging symbols found)...
done.
Reading symbols from /usr/lib/libutil.so.3...(no debugging symbols found)...
done.
Reading symbols from /usr/lib/libz.so.2...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libwrap.so.3...(no debugging symbols found)...
done.
Reading symbols from /usr/lib/libpam.so.1...(no debugging symbols found)...
done.
Reading symbols from /usr/lib/libc.so.4...(no debugging symbols found)...done.
Reading symbols from /usr/libexec/ld-elf.so.1...(no debugging symbols found)...
done.
#0 0x281681c8 in login_getpwclass () from /usr/lib/libutil.so.3
(gdb) quit
u-2.04# ident /usr/sbin/sshd
/usr/sbin/sshd:
$OpenBSD: sshd.c,v 1.132 2000/10/13 18:34:46 markus Exp $
$FreeBSD: src/crypto/openssh/sshd.c,v 1.6.2.6 2001/02/12 06:45:42 kris Exp $
$OpenBSD: auth-rhosts.c,v 1.16 2000/10/03 18:03:03 markus Exp $
$OpenBSD: auth-passwd.c,v 1.18 2000/10/03 18:03:03 markus Exp $
$FreeBSD: src/crypto/openssh/auth-passwd.c,v 1.2.2.3 2001/01/12 04:25:55 green Exp $
$OpenBSD: auth-rsa.c,v 1.32 2000/10/14 12:19:45 markus Exp $
$FreeBSD: src/crypto/openssh/auth-rsa.c,v 1.2.2.3 2001/01/12 04:25:55 green Exp $
$OpenBSD: auth-rh-rsa.c,v 1.17 2000/10/03 18:03:03 markus Exp $
$FreeBSD: src/crypto/openssh/auth-rh-rsa.c,v 1.1.1.1.2.3 2001/01/12 04:25:55 green Exp $
$OpenBSD: pty.c,v 1.16 2000/09/07 21:13:37 markus Exp $
$FreeBSD: src/crypto/openssh/pty.c,v 1.2.2.2 2000/10/28 23:00:49 kris Exp $
$OpenBSD: log-server.c,v 1.17 2000/09/12 20:53:10 markus Exp $
$OpenBSD: login.c,v 1.15 2000/09/07 20:27:52 deraadt Exp $
$FreeBSD: src/crypto/openssh/login.c,v 1.3.2.2 2000/10/28 23:00:48 kris Exp $
$OpenBSD: servconf.c,v 1.53 2000/10/14 12:12:09 markus Exp $
$FreeBSD: src/crypto/openssh/servconf.c,v 1.3.2.8 2001/01/27 07:48:28 green Exp $
$OpenBSD: serverloop.c,v 1.34 2000/10/27 07:32:18 markus Exp $
$OpenBSD: auth.c,v 1.11 2000/10/11 20:27:23 markus Exp $
$FreeBSD: src/crypto/openssh/auth.c,v 1.3.2.3 2001/01/12 04:25:55 green Exp $
$OpenBSD: auth1.c,v 1.6 2000/10/11 20:27:23 markus Exp $
$FreeBSD: src/crypto/openssh/auth1.c,v 1.3.2.4 2001/01/12 04:25:55 green Exp $
$OpenBSD: auth2.c,v 1.20 2000/10/14 12:16:56 markus Exp $
$FreeBSD: src/crypto/openssh/auth2.c,v 1.2.2.4 2001/01/12 04:25:55 green Exp $
$OpenBSD: auth-options.c,v 1.5 2000/10/09 21:32:34 markus Exp $
$OpenBSD: session.c,v 1.42 2000/10/27 07:32:18 markus Exp $
$FreeBSD: src/crypto/openssh/session.c,v 1.4.2.7 2001/02/04 20:21:06 green Exp $
$OpenBSD: dh.c,v 1.2 2000/10/11 20:11:35 markus Exp $
$FreeBSD: src/crypto/openssh/auth-pam.c,v 1.2.2.1 2001/01/12 04:25:54 green Exp $
$FreeBSD: src/crypto/openssh/auth2-skey.c,v 1.2.2.1 2001/01/12 04:25:55 green Exp $
$OpenBSD: auth2-skey.c,v 1.1 2000/10/11 20:14:38 markus Exp $
$OpenBSD: auth-skey.c,v 1.9 2000/10/19 16:41:13 deraadt Exp $
$FreeBSD: src/crypto/openssh/auth-skey.c,v 1.1.1.1.2.4 2001/01/12 04:25:55 green Exp $
$OpenBSD: kex.c,v 1.12 2000/10/11 20:27:23 markus Exp $
$OpenBSD: dispatch.c,v 1.5 2000/09/21 11:25:34 markus Exp $
$OpenBSD: ttymodes.c,v 1.8 2000/09/07 20:27:55 deraadt Exp $
$OpenBSD: tildexpand.c,v 1.8 2000/09/07 20:27:55 deraadt Exp $
$OpenBSD: rsa.c,v 1.16 2000/09/07 20:27:53 deraadt Exp $
$FreeBSD: src/crypto/openssh/rsa.c,v 1.1.1.1.2.6 2001/02/12 06:45:42 kris Exp $
$OpenBSD: readpass.c,v 1.12 2000/10/11 20:14:39 markus Exp $
$OpenBSD: mpaux.c,v 1.14 2000/09/07 20:27:52 deraadt Exp $
$FreeBSD: src/crypto/openssh/mpaux.c,v 1.2.2.2 2000/10/28 23:00:48 kris Exp $
$OpenBSD: hostfile.c,v 1.20 2000/09/07 20:27:51 deraadt Exp $
$FreeBSD: src/crypto/openssh/hostfile.c,v 1.1.1.1.2.2 2000/10/28 23:00:48 kris Exp $
$OpenBSD: authfile.c,v 1.20 2000/10/11 20:27:23 markus Exp $
$FreeBSD: src/crypto/openssh/authfile.c,v 1.2.2.3 2001/01/12 04:25:55 green Exp $
$OpenBSD: cli.c,v 1.2 2000/10/16 09:38:44 djm Exp $
$OpenBSD: match.c,v 1.9 2000/09/07 20:27:52 deraadt Exp $
$OpenBSD: dsa.c,v 1.11 2000/09/07 20:27:51 deraadt Exp $
$OpenBSD: xmalloc.c,v 1.8 2000/09/07 20:27:55 deraadt Exp $
$OpenBSD: packet.c,v 1.38 2000/10/12 14:21:12 markus Exp $
$OpenBSD: hmac.c,v 1.4 2000/09/07 20:27:51 deraadt Exp $
$OpenBSD: crc32.c,v 1.7 2000/09/07 20:27:51 deraadt Exp $
$OpenBSD: compress.c,v 1.9 2000/09/07 20:27:50 deraadt Exp $
$OpenBSD: cipher.c,v 1.37 2000/10/23 19:31:54 markus Exp $
$FreeBSD: src/crypto/openssh/cipher.c,v 1.2.2.3 2001/01/12 04:25:56 green Exp $
$OpenBSD: nchan.c,v 1.19 2000/09/07 20:27:52 deraadt Exp $
$OpenBSD: channels.c,v 1.72 2000/10/27 07:48:22 markus Exp $
$OpenBSD: canohost.c,v 1.16 2000/10/21 17:04:22 markus Exp $
$FreeBSD: src/crypto/openssh/canohost.c,v 1.1.1.1.2.4 2001/01/12 04:25:56 green Exp $
$OpenBSD: authfd.c,v 1.29 2000/10/09 21:51:00 markus Exp $
$FreeBSD: src/crypto/openssh/authfd.c,v 1.2.2.4 2001/01/12 04:25:55 green Exp $
$OpenBSD: util.c,v 1.6 2000/10/27 07:32:19 markus Exp $
$OpenBSD: key.c,v 1.11 2000/09/07 20:27:51 deraadt Exp $
$FreeBSD: src/crypto/openssh/key.c,v 1.4.2.2 2000/10/28 23:00:48 kris Exp $
$OpenBSD: atomicio.c,v 1.7 2000/10/18 18:04:02 markus Exp $
$OpenBSD: uidswap.c,v 1.9 2000/09/07 20:27:55 deraadt Exp $
$FreeBSD: src/crypto/openssh/compat.c,v 1.1.1.1.2.3 2001/01/12 04:25:56 green Exp $
$OpenBSD: compat.c,v 1.27 2000/10/31 09:31:58 markus Exp $
$OpenBSD: bufaux.c,v 1.13 2000/09/07 20:27:50 deraadt Exp $
$FreeBSD: src/crypto/openssh/bufaux.c,v 1.2.2.2 2000/10/28 23:00:47 kris Exp $
$OpenBSD: uuencode.c,v 1.7 2000/09/07 20:27:55 deraadt Exp $
$OpenBSD: buffer.c,v 1.8 2000/09/07 20:27:50 deraadt Exp $
$OpenBSD: log.c,v 1.11 2000/09/30 16:27:43 markus Exp $
>How-To-Repeat:
Try to login via ssh to a machine that was cvsup'd around the same time as this machine (I don't think the problem has been corrected yet, since this happens on a machine that I rebuilt from cvs this past weekend as well as the machine listed above) with a user that does not exist on the machine. sshd with dump core and its core will be in /
>Fix:
Dunno... sorry.
>Release-Note:
>Audit-Trail:
>Unformatted:
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