Similarly, the SCP client application can use either slash or backslash characters, but not all SCP clients treat backslash characters as equivalent to slash characters. When using SCP to copy files from an external device to the file system, the SCP server will accept either forward slash (‟/”) or backslash (‟\”) characters to delimit directory and/or filenames. When the global SSH server process is disabled, no inbound SSH, SCP, sFTP, or NETCONF sessions When the server is enabled,Īll inbound SSH, SCP, sFTP, and NETCONF sessions will be accepted provided the session Only SSHv2 RSA is supported in FIPS mode. Key size is non-configurable and set to 2048 for SSHv2 RSA, and to 1024 for SSHv2 DSAĪnd SSHv1 RSA1. Only valid until the node is restarted or the SSH server is stopped and restarted. Preserve-key option is configured for SSH, the security key is When the SSH server is enabled, an SSH security key is generated. SFTP, and NETCONF sessions are counted as SSH sessions. Menu, However there is a maximum total of 50 sessions for SSH and Telnet together. Inbound SSH, Telnet, and FTP sessions are counted separately and it is possible to set the limit This server process is separate from the SSHĪnd SCP client commands on the routers which initiate outbound SSH and SCP sessions. Initiated by external client applications. Global SSH server process to support inbound SSH, sFTP, NETCONF, and SCP sessions SSH runs on top of a transport layer (like TCP or IP), and provides authentication and encryption capabilities. SSHv2 does not use the same networking implementation that SSHv1 does and is consideredĪ more secure, efficient, and portable version of SSH. SSHv1 and SSHv2 are different protocols and encrypt at different parts of the packets. The administrator to configure Secure Shell version 1 (SSHv1) and version 2 (SSHv2). With authentication and encryption, SSH allows for a secure connection over an Places by one of the configured authentication methods (local, RADIUS, TACACS+, and A connection is always initiated by the client (the user). The command log show -info -predicate 'process = "ssh" or eventMessage contains "ssh"' can be used to review outgoing SSH connection activity.Secure Shell (SSH) is a protocol that provides a secure, encrypted Telnet-like connection to a For example, on macOS systems log show -predicate 'process = "sshd"' can be used to review incoming SSH connection attempts for suspicious activity. Monitor for newly executed processes that may use Valid Accounts to log into remote machines using Secure Shell (SSH). Other factors, such as access patterns and activity that occurs after a remote login, may indicate suspicious or malicious behavior with SSH. Use of SSH may be legitimate depending on the environment and how it’s used. Monitor for newly constructed network connections (typically port 22) that may use Valid Accounts to log into remote machines using Secure Shell (SSH). For example, on Linux systems SSH logon activity can be found in the logs located in /var/log/auth.log or /var/log/secure depending on the distro you are using. Monitor for user accounts logged into systems that may use Valid Accounts to log into remote machines using Secure Shell (SSH). Limit which user accounts are allowed to login via SSH. Require multi-factor authentication for SSH connections wherever possible, such as password protected SSH keys. For macOS ensure Remote Login is disabled under Sharing Preferences. ĭisable the SSH daemon on systems that do not require it. TEMP.Veles has relied on encrypted SSH-based tunnels to transfer tools and for remote command/program execution. TeamTNT has also used SSH to transfer tools and payloads onto victim hosts and execute them. TeamTNT has used SSH to connect back to victim machines. OilRig has used Putty to access compromised systems. MenuPass has used Putty Secure Copy Client (PSCP) to transfer data. Leviathan used ssh for internal reconnaissance. Lazarus Group used SSH and the PuTTy PSCP utility to gain access to a restricted segment of a compromised network. Kinsing has used SSH for lateral movement. įox Kitten has used the PuTTY and Plink tools for lateral movement. įIN7 has used SSH to move laterally through victim environments. Įmpire contains modules for executing commands over SSH as well as in-memory VNC agent injection. Ĭobalt Strike can SSH to a remote service. īlackTech has used Putty for remote access. APT39 used secure shell (SSH) to move laterally among their targets.
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