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BSD Secure Shella is a suite of security related network level utilities based on the Secure Shell SSH protocol, which help to secure network communications via the encryption of network traffic over multiple authentication methods and by providing secure tunneling capabilities. Open. SSH started as a fork of the free SSH program, developed by Tatu Ylnen later versions of Ylnens SSH were proprietary software, offered by SSH Communications Security. Open. SSH was first released as part of the Open. BSD operating system in 1. Bringing Architecture To The Next Level Pdf here. Open. SSH is not a single computer program, but rather a suite of programs that serve as alternatives to unencrypted network communication protocols like FTP and rlogin. Active development primarily takes place within the Open. BSD source tree. Open. SSH is integrated into the base system of several other BSD projects,678 while the portable version is available as a package in other Unix like systems. HistoryeditOpen. SSH was created by the Open. BSD team as an alternative to the original SSH software by Tatu Ylnen, which is now proprietary software. Although source code is available for the original SSH, various restrictions are imposed on its use and distribution. Open. SSH was created as a fork of Bjrn Grnvalls OSSH that itself was a fork of Tatu Ylnens original free SSH 1. The Open. SSH developers claim that their application is more secure than the original, due to their policy of producing clean and audited code and because it is released under the BSD license, the open source license to which the word open in the name refers. Open. SSH first appeared in Open. BSD 2. 6. The first portable release was made in October 1. Developments since then have included the addition of ciphers e. January 2. 01. 41. Open. SSL 6. 7, October 2. DSA to Ed. 25. 51. March 2. 01. 51. On 1. October 2. Microsoft announced that Open. SSH will be natively supported on Windows and accessible through Windows Power. Shell, releasing an early implementation and making the code publicly available. Development and structureedit. Open. SSH remotely controlling a server through Unix shell. Open. SSH is developed as part of the Open. BSD operating system. Rather than including changes for other operating systems directly into Open. SSH, a separate portability infrastructure is maintained by the Open. SSH Portability Team and portable releases are made periodically. This infrastructure is substantial, partly because Open. SSH is required to perform authentication, a capability that has many varying implementations. This model is also used for other Open. BSD projects such as Open. NTPD. The Open. SSH suite includes the following command line utilities and daemons ssh, a replacement for rlogin, rsh and telnet to allow shell access to a remote machine. SSH server daemonssh keygen, a tool to inspect and generate the RSA, DSA and Elliptic Curve keys that are used for user and host authenticationssh agent and ssh add, utilities to ease authentication by holding keys ready and avoid the need to enter passphrases every time they are usedssh keyscan, which scans a list of hosts and collects their public keys. The Open. SSH server can authenticate users using the standard methods supported by the ssh protocol with a password public key authentication, using per user keys host based authentication, which is a secure version of rlogins host trust relationships using public keys keyboard interactive, a generic challenge response mechanism that is often used for simple password authentication but which can also make use of stronger authenticators such as tokens and KerberosGSSAPI. The server makes use of authentication methods native to the host operating system this can include using the BSD Authentication system or Pluggable authentication modules PAM to enable additional authentication through methods such as one time passwords. However, this occasionally has side effects when using PAM with Open. SSH it must be run as root, as root privileges are typically required to operate PAM. Open. SSH versions after 3. September 2. 00. 3 allow PAM to be disabled at run time, so regular users can run sshd instances. On Open. BSD, Open. SSH utilizes a dedicated sshd user by default to drop privileges and perform privilege separation in accordance to Open. BSDs least privilege policy that has been applied throughout the operating system such as for their X server see Xenocara. FeatureseditOpen. SSH includes the ability to forward remote TCP ports over a secure tunnel, allowing that way arbitrary TCP ports on the server side and on the client side to be connected through an SSH tunnel. This is used to multiplex additional TCP connections over a single SSH connection, to conceal connections and encrypting protocols that are otherwise unsecured, and to circumvent firewalls what opens up space for potential security issues. An X Window System tunnel may be created automatically when using Open. SSH to connect to a remote host, and other protocols, such as HTTP and VNC, may be forwarded easily. In addition, some third party software includes support for tunnelling over SSH. These include Dist. CC, CVS, rsync, and Fetchmail. On some operating systems, remote file systems can be mounted over SSH using tools such as sshfs using FUSE. An ad hoc. SOCKS proxy server may be created using Open. SSH. This allows more flexible proxying than is possible with ordinary port forwarding. Beginning with version 4. Open. SSH implements an OSI layer 23 tun based VPN. This is the most flexible of Open. SSHs tunnelling capabilities, allowing applications to transparently access remote network resources without modifications to make use of SOCKS. VulnerabilitieseditIn the case of using default configuration, the attackers success probability for recovering 1. The Open. SSH 5. 2 release modified the behavior of the Open. SSH server2. 32. A privilege escalation vulnerability existed in Open. SSH 6. 8 to 6. 9 CVE 2. TTY devices, which was believed to be a Denial of Service vulnerability. With the use of the TIOCSTI ioctl, it was possible to inject characters into other users terminals and execute arbitrary commands on Linux. Malicious or compromised Open. SSH servers could steal private login keys for other systems, using a vulnerability that relies on the undocumented connection resuming feature of the Open. SSH client, which is called roaming, enabled by default on the client, but not supported on the Open. SSH server. This applies to versions 5. March 2. 01. 02. Open. SSH client, and was fixed in Open. SSH 7. 1p. 2, released on 1. January 2. 01. 6. CVE numbers associated to this vulnerability are CVE 2. CVE 2. 01. 6 0. TrademarkeditIn February 2. Tatu Ylnen, Chairman and CTO of SSH Communications Security informed the Open.