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2049 - Pentesting NFS Service

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Basic Information

It is a client/server system that allows users to access files across a network and treat them as if they resided in a local file directory.

Default port: 2049

2049/tcp open  nfs     2-3 (RPC #100003

Enumeration

Useful nmap scripts

nfs-ls #List NFS exports and check permissions
nfs-showmount #Like showmount -e
nfs-statfs #Disk statistics and info from NFS share

Useful metasploit modules

scanner/nfs/nfsmount #Scan NFS mounts and list permissions

Mounting

To know which folder has the server available to mount you an ask it using:

showmount -e <IP>

Then mount it using:

mount -t nfs [-o vers=2] <ip>:<remote_folder> <local_folder> -o nolock

You should specify to use version 2 because it doesn't have any authentication or authorization.

Example:

mkdir /mnt/new_back
mount -t nfs [-o vers=2] 10.12.0.150:/backup /mnt/new_back -o nolock

Permissions

If you mount a folder which contains files or folders only accesible by some user (by UID). You can create locally a user with that UID and using that user you will be able to access the file/folder.

NSFShell

To easily list, mount and change UID and GID to have access to files you can use nfsshell.

Nice NFSShell tutorial.

Config files

/etc/exports
/etc/lib/nfs/etab

Privilege Escalation using NFS misconfigurations

NFS no_root_squash and no_all_squash privilege escalation

HackTricks Automatic Commands

Protocol_Name: NFS    #Protocol Abbreviation if there is one.
Port_Number:  2049     #Comma separated if there is more than one.
Protocol_Description: Network File System         #Protocol Abbreviation Spelled out

Entry_1:
  Name: Notes
  Description: Notes for NFS
  Note: |
    It is a client/server system that allows users to access files across a network and treat them as if they resided in a local file directory.

    #apt install nfs-common
    showmount 10.10.10.180      ~or~showmount -e 10.10.10.180
    should show you available shares (example /home)

    mount -t nfs -o ver=2 10.10.10.180:/home /mnt/
    cd /mnt
    nano into /etc/passwd and change the uid (probably 1000 or 1001) to match the owner of the files if you are not able to get in

    https://book.hacktricks.xyz/pentesting/nfs-service-pentesting

Entry_2:
  Name: Nmap
  Description: Nmap with NFS Scripts
  Command: nmap --script=nfs-ls.nse,nfs-showmount.nse,nfs-statfs.nse -p 2049 {IP}