Package: ssh Version: 1:3.8.1p1-8.sarge.4 Severity: critical Here is my testcase:
$ scp remotehost@';uname -a' Linux pancake 2.6.11-1-686 #1 Mon Jun 20 22:00:38 MDT 2005 i686 GNU/Linux That line comes from the remote host (I verified this by trying hostname command instead of uname -a, that gives the name of the remote host). I also tried connecting to my own machine this way (localhost@), and it executes arbitrary commands, too. So I won't put the versions of packages on the remote host here, because the ssh server on the local host is vulnerable as well. I'm not sure that this is a security hole because a user can anyway connect with ssh and execute arbitrary commands. But it can possibly be a vulnerability if the user account has a restricted shell, or PAM restrictions that allow scp but disallow ssh are in effect. I haven't checked these cases, but I set this bug's severity to critical just in case it really turns out to be a security hole. In addition to being or not being a security hole, it's also a major bug that prevents from transferring files with special characters in names via scp. The workaround is to escape them with backslashes. (Because you are typing the scp command itself in a shell, the backslashes themselves, along with the other special characters, need to be escaped, too.) The user that I was authenticating as had /bin/bash as his shell. The version of bash package is 3.0-15. Below is my /etc/ssh/sshd_config. # Package generated configuration file # See the sshd(8) manpage for details # What ports, IPs and protocols we listen for Port 22 # Use these options to restrict which interfaces/protocols sshd will bind to #ListenAddress :: #ListenAddress 0.0.0.0 Protocol 2 # HostKeys for protocol version 2 HostKey /etc/ssh/ssh_host_rsa_key HostKey /etc/ssh/ssh_host_dsa_key #Privilege Separation is turned on for security UsePrivilegeSeparation yes # Lifetime and size of ephemeral version 1 server key KeyRegenerationInterval 3600 ServerKeyBits 768 # Logging SyslogFacility AUTH LogLevel INFO # Authentication: LoginGraceTime 600 PermitRootLogin yes StrictModes yes RSAAuthentication yes PubkeyAuthentication yes #AuthorizedKeysFile %h/.ssh/authorized_keys # 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_known_hosts RhostsRSAAuthentication no # similar for protocol version 2 HostbasedAuthentication no # Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication #IgnoreUserKnownHosts yes # To enable empty passwords, change to yes (NOT RECOMMENDED) PermitEmptyPasswords no # Change to no to disable s/key passwords #ChallengeResponseAuthentication yes # Change to yes to enable tunnelled clear text passwords PasswordAuthentication no # To change Kerberos options #KerberosAuthentication no #KerberosOrLocalPasswd yes #AFSTokenPassing no #KerberosTicketCleanup no # Kerberos TGT Passing does only work with the AFS kaserver #KerberosTgtPassing yes X11Forwarding yes X11DisplayOffset 10 PrintMotd no PrintLastLog yes KeepAlive yes #UseLogin no #MaxStartups 10:30:60 #Banner /etc/issue.net Subsystem sftp /usr/lib/sftp-server UsePAM yes -- System Information: Debian Release: testing/unstable APT prefers testing-proposed-updates APT policy: (900, 'testing-proposed-updates'), (900, 'testing'), (900, 'stable'), (800, 'unstable') Architecture: i386 (i686) Shell: /bin/sh linked to /bin/bash Kernel: Linux 2.6.11-1-686 Locale: LANG=ru_RU.KOI8-R, LC_CTYPE=ru_RU.KOI8-R (charmap=KOI8-R) Versions of packages ssh depends on: ii adduser 3.67 Add and remove users and groups ii debconf 1.4.57 Debian configuration management sy ii dpkg 1.13.11 package maintenance system for Deb ii libc6 2.3.5-6 GNU C Library: Shared libraries an ii libpam-modules 0.76-23 Pluggable Authentication Modules f ii libpam-runtime 0.76-23 Runtime support for the PAM librar ii libpam0g 0.76-23 Pluggable Authentication Modules l ii libssl0.9.7 0.9.7e-3 SSL shared libraries ii libwrap0 7.6.dbs-8 Wietse Venema's TCP wrappers libra ii zlib1g 1:1.2.2-4.sarge.2 compression library - runtime ssh recommends no packages. -- debconf-show failed -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
