mirror of
https://github.com/carlospolop/hacktricks
synced 2024-11-15 09:27:32 +00:00
101 lines
2.8 KiB
Markdown
101 lines
2.8 KiB
Markdown
# 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
|
|
|
|
```text
|
|
2049/tcp open nfs 2-3 (RPC #100003
|
|
```
|
|
|
|
## Enumeration
|
|
|
|
### Useful nmap scripts
|
|
|
|
```bash
|
|
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
|
|
|
|
```bash
|
|
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:
|
|
|
|
```bash
|
|
showmount -e <IP>
|
|
```
|
|
|
|
Then mount it using:
|
|
|
|
```bash
|
|
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:**
|
|
|
|
```bash
|
|
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](https://github.com/NetDirect/nfsshell).
|
|
|
|
[Nice NFSShell tutorial.](https://www.pentestpartners.com/security-blog/using-nfsshell-to-compromise-older-environments/)
|
|
|
|
## Config files
|
|
|
|
```text
|
|
/etc/exports
|
|
/etc/lib/nfs/etab
|
|
```
|
|
|
|
## Privilege Escalation using NFS misconfigurations
|
|
|
|
[NFS no\_root\_squash and no\_all\_squash privilege escalation](../linux-unix/privilege-escalation/nfs-no_root_squash-misconfiguration-pe.md)
|
|
|
|
## HackTricks Automatic Commands
|
|
|
|
```text
|
|
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}
|
|
```
|
|
|