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73 lines
1.8 KiB
Markdown
73 lines
1.8 KiB
Markdown
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# 2049 - Pentesting NFS Service
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## **Basic Information**
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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.
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**Default port**: 2049
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```text
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2049/tcp open nfs 2-3 (RPC #100003
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```
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## Enumeration
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### Useful nmap scripts
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```bash
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nfs-ls #List NFS exports and check permissions
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nfs-showmount #Like showmount -e
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nfs-statfs #Disk statistics and info from NFS share
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```
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### Useful metasploit modules
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```bash
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scanner/nfs/nfsmount #Scan NFS mounts and list permissions
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```
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### Mounting
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To know **which folder** has the server **available** to mount you an ask it using:
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```bash
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showmount -e <IP>
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```
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Then mount it using:
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```bash
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mount -t nfs [-o vers=2] <ip>:<remote_folder> <local_folder> -o nolock
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```
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You should specify to **use version 2** because it doesn't have **any** **authentication** or **authorization**.
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**Example:**
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```bash
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mkdir /mnt/new_back
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mount -t nfs [-o vers=2] 10.12.0.150:/backup /mnt/new_back -o nolock
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```
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## Permissions
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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.
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## NSFShell
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To easily list, mount and change UID and GID to have access to files you can use [nfsshell](https://github.com/NetDirect/nfsshell).
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[Nice NFSShell tutorial.](https://www.pentestpartners.com/security-blog/using-nfsshell-to-compromise-older-environments/)
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## Config files
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```text
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/etc/exports
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/etc/lib/nfs/etab
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```
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## Privilege Escalation using NFS misconfigurations
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[NFS no\_root\_squash and no\_all\_squash privilege escalation](../linux-unix/privilege-escalation/nfs-no_root_squash-misconfiguration-pe.md)
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