TMA-COS-5.1.20

Ensure SSH AllowTcpForwarding is disabled

ThấpCấp 2Tự độngcos

Mô tả

SSH port forwarding is a mechanism in SSH for tunneling application ports from the client to the server, or servers to clients. It can be used for adding encryption to legacy applications, going through firewalls, and some system administrators and IT professionals use it for opening backdoors into the internal network from their home machines Leaving port forwarding enabled can expose the organization to security risks and back- doors. SSH connections are protected with strong encryption. This makes their contents invisible to most deployed network monitoring and traffic filtering solutions. This invisibility carries considerable risk potential if it is used for malicious purposes such as data exfiltration. Cybercriminals or malware could exploit SSH to hide their unauthorized communications, or to exfiltrate stolen data from the target network

Cách kiểm tra

Phương pháp kiểm tra: Lệnh shell

shell

alt0() { command -v grep >/dev/null 2>&1 || { echo "step1: grep not installed"; return 1; }; command -v sshd >/dev/null 2>&1 || { echo "step1: sshd not installed"; return 1; }; o=$(bash -c 'sshd -T | grep -i allowtcpforwarding' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- 'AllowTcpForwarding no' || { echo step1: missing 'AllowTcpForwarding no'; return 1; }; }; if alt0; then echo compliant; fi

Đầu ra mong đợi: compliant

Cách khắc phục

Phương pháp khắc phục: Hướng dẫn hoặc bản vá hạ tầng

Edit the /etc/ssh/sshd_config file to set the parameter as follows: AllowTcpForwarding no

Thuộc tính

Hệ điều hành: Bất kỳ
Thẻ: container-optimized-oscosssh
Tham chiếu: CIS Google Container-Optimized OS Benchmark v1.2.0 - 5.1.20 Ensure SSH AllowTcpForwarding is disabled

Kiểm tra máy này

Chạy lệnh này trên máy bạn được phép kiểm tra. Lần quét chỉ ở chế độ đọc.

shell

tmaegis scan --target cos --level 2