Why Do Some Companies Allow Outbound SSH Despite Strict IT Policies?

Large multinational companies often have stringent IT policies to protect their networks and data. However, some of these companies allow outbound SSH connections, which can seem contradictory given the potential risks. SSH (Secure Shell) is a protocol used for secure remote access, and it's essential for managing servers, transferring files securely, and tunneling other protocols. The primary reason for allowing outbound SSH is operational necessity. Large companies with global operations require secure remote access to various servers and systems. SSH is a standard tool for system administrators and developers to manage and maintain servers remotely. Additionally, SSH itself is a secure protocol that uses encryption to protect data in transit, which is crucial for maintaining confidentiality and integrity. However, allowing outbound SSH does come with risks. SSH tunneling can be used to bypass security controls, potentially allowing unauthorized access or activities. It can also be used for data exfiltration or establishing command and control channels if a system is compromised. Despite these risks, companies might not block outbound SSH due to business requirements, the complexity of blocking, trust in employees, or the presence of alternative controls. To mitigate these risks, companies can implement whitelisting, monitoring and logging, multi-factor authentication, SSH bastion hosts, and network segmentation. These measures can help balance the operational necessity of SSH with the need to protect against potential misuse.