Date: Sat, 6 Jul 2002 02:47:06 -0700 (PDT) From: Christian Laursen <xi@borderworlds.dk> To: freebsd-gnats-submit@FreeBSD.org Subject: bin/40261: sshd allows PasswordAuthentication even though it is turned off if ChallengeResponseAuthentication is enabled Message-ID: <200207060947.g669l6Aw007525@www.freebsd.org>
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>Number: 40261 >Category: bin >Synopsis: sshd allows PasswordAuthentication even though it is turned off if ChallengeResponseAuthentication is enabled >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sat Jul 06 02:50:01 PDT 2002 >Closed-Date: >Last-Modified: >Originator: Christian Laursen >Release: FreeBSD 4.6-STABLE >Organization: The Border Worlds >Environment: FreeBSD ferengi.borderworlds.dk 4.6-STABLE FreeBSD 4.6-STABLE #17: Fri Jul 5 10:42:51 CEST 2002 root@ferengi.borderworlds.dk:/usr/obj/usr/src/sys/FERENGI i386 >Description: After upgrading yesterday and now running OpenSSH 3.4p1 I discovered by accident, that I could log into my machine using PasswordAuthentication even though I had disabled that in sshd_config. After I tried disabling ChallengeResponseAuthentication too, it was no longer possible to log in using passwords. This is the OpenSSH included in the base system. >How-To-Repeat: This is my sshd_config, that produces the surprising behaviour: # $OpenBSD: sshd_config,v 1.56 2002/06/20 23:37:12 markus Exp $ # $FreeBSD: src/crypto/openssh/sshd_config,v 1.4.2.9 2002/07/03 22:11:44 des Exp $ # This is the sshd server system-wide configuration file. See # sshd_config(5) for more information. # This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin # The strategy used for options in the default sshd_config shipped with # OpenSSH is to specify options with their default value where # possible, but leave them commented. Uncommented options change a # default value. # Note that some of FreeBSD's defaults differ from OpenBSD's, and # FreeBSD has a few additional options. #VersionAddendum FreeBSD-20020629 #Port 22 Protocol 2 #ListenAddress 0.0.0.0 #ListenAddress :: # HostKey for protocol version 1 #HostKey /etc/ssh/ssh_host_key # HostKeys for protocol version 2 #HostKey /etc/ssh/ssh_host_rsa_key #HostKey /etc/ssh/ssh_host_dsa_key # Lifetime and size of ephemeral version 1 server key #KeyRegenerationInterval 3600 #ServerKeyBits 768 # Logging #obsoletes QuietMode and FascistLogging #SyslogFacility AUTH #LogLevel INFO # Authentication: #LoginGraceTime 120 #PermitRootLogin no #StrictModes yes #RSAAuthentication yes #PubkeyAuthentication yes #AuthorizedKeysFile .ssh/authorized_keys # rhosts authentication should not be used #RhostsAuthentication no # Don't read the user's ~/.rhosts and ~/.shosts files #IgnoreRhosts yes # For this to work you will also need host keys in /etc/ssh/ssh_known_hosts #RhostsRSAAuthentication no # similar for protocol version 2 #HostbasedAuthentication no # Change to yes if you don't trust ~/.ssh/known_hosts for # RhostsRSAAuthentication and HostbasedAuthentication #IgnoreUserKnownHosts no # To disable tunneled clear text passwords, change to no here! PasswordAuthentication no #PermitEmptyPasswords no # Change to no to disable PAM authentication #ChallengeResponseAuthentication no # Kerberos options #KerberosAuthentication no #KerberosOrLocalPasswd yes #KerberosTicketCleanup yes #AFSTokenPassing no # Kerberos TGT Passing only works with the AFS kaserver #KerberosTgtPassing no #X11Forwarding yes #X11DisplayOffset 10 #X11UseLocalhost yes #PrintMotd yes #PrintLastLog yes #KeepAlive yes #UseLogin no UsePrivilegeSeparation yes #Compression yes #MaxStartups 10 # no default banner path #Banner /some/path #VerifyReverseMapping no # override default of no subsystems #Subsystem sftp /usr/libexec/sftp-server >Fix: >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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