RPC & NFS | 111, 2049

NFS allows systems to access and share files over a network as if they were local. RPC enables programs to execute functions on remote systems, supporting services like NFS through netw communication

01. Basic Enumerations

## ------------------| Nmap Scan
sudo nmap --script nfs* -sV -p111,2049 $IP

## ------------------| List mounts
showmount -e $IP

## ------------------| List both the client and hostname or IP
showmount -a $IP

02. Mount option

sudo mkdir -p /mnt/remote
sudo mount -t nfs $IP:/ /mnt/remote
sudo mount -t nfs $IP:/ /mnt/remote -o nolock
sudo mount -t nfs $IP:/site_backups /mnt/remote
sudo mount -t nfs $IP:/site_backups /mnt/remote -o nolock

03. Privilege Escalation

### If the “no_root_squash” option is present on a writable share, we can create an executable with SUID bit set and run it on the target system         
## ------------------| Check if no_root_squash is present?
cat /etc/exports | grep no_root_squash

## ------------------| List mounts and mount it to our local machine
showmount -e $IP
sudo mkdir -p /mnt/new
sudo mount -t nfs $IP:/<WritableShares> /mnt/new
sudo mount -t nfs -o vers=2 $IP:/<WritableShares> /mnt/new

### Create a SUID binary and place it. then execuite it via attackers machine.