TMA-COS-2.1.3
Ensure NFS and RPC are not enabled
Description
The Network File System (NFS) is one of the first and most widely distributed file systems in the UNIX environment. It provides the ability for systems to mount file systems of other servers through the network. If the system does not export NFS shares or act as an NFS client, it is recommended that these services be disabled to reduce the remote attack surface.
How it is checked
Audit method: Shell command
alt0() { command -v systemctl >/dev/null 2>&1 || { echo "step1: systemctl not installed"; return 1; }; o=$(bash -c 'systemctl is-enabled nfs-server' 2>&1); printf '%s\n' "$o" | tr -s ' \t' ' ' | sed 's/^ //;s/ $//' | grep -Fxq -- disabled || { echo step1: missing disabled; return 1; }; command -v systemctl >/dev/null 2>&1 || { echo "step2: systemctl not installed"; return 1; }; o=$(bash -c 'systemctl is-enabled rpcbind' 2>&1); printf '%s\n' "$o" | tr -s ' \t' ' ' | sed 's/^ //;s/ $//' | grep -Fxq -- disabled || { echo step2: missing disabled; return 1; }; }; if alt0; then echo compliant; fi- Expected output
compliant
How it is fixed
Fix method: Guidance or infrastructure patch
Run the following commands to disable the nfs-server and rpcbind: # systemctl --now disable nfs-server # systemctl --now disable rpcbind /etc is stateless on Container-Optimized OS. Therefore, the steps mentioned above needs to be performed after every boot.
Properties
- Operating systems
- Any
- Tags
- container-optimized-oscos
- Reference
- CIS Google Container-Optimized OS Benchmark v1.2.0 - 2.1.3 Ensure NFS and RPC are not enabled
Check this host
Run this on a machine you are allowed to audit. The scan is read-only.
tmaegis scan --target cos