mirror of https://github.com/carlospolop/hacktricks synced 2024-11-26 14:40:37 +00:00

autoad 19fd72e857 Ad hacktricks sponsoring

2022-04-28 16:01:33 +00:00

5 KiB

Raw Blame History

Support HackTricks and get benefits!

Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!

Discover The PEASS Family, our collection of exclusive NFTs

Get the official PEASS & HackTricks swag

Join the 💬 Discord group or the telegram group or follow me on Twitter 🐦@carlospolopm.

Share your hacking tricks submitting PRs to the hacktricks github repo.

2049 - Pentesting NFS Service

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}