NFS
NFSNetwork File SystemNFS Share
NFS (Network File System) shares directories over the network. Misconfigured exports (no_root_squash) allow root-level file access and privilege escalation.
Ports
| Port | Protocol | Description |
|---|---|---|
| 2049 | tcp/udp | NFS |
| 111 | tcp/udp | Portmapper/rpcbind |
| 20048 | tcp | mountd |
Fingerprints
| Banner / Probe | Expected Response |
|---|---|
nmap -sV -p <port> <target> | Service banner and version info |
nc -nv <target> <port> | Raw banner grab |
Key Files
| Path | Description |
|---|---|
/etc/passwd | List of system users |
/etc/shadow | Password hashes for local users |
/etc/ssh/sshd_config | SSH server configuration |
~/.ssh/id_rsa | SSH private key |
Default Credentials
| Username | Password | Context |
|---|---|---|
admin | admin | Generic admin account |
root | root | Generic root account |
Known CVEs
| Identifier | Type | Description |
|---|---|---|
— | PE | no_root_squash misconfiguration |
Exploitation Primitives
| Technique | Tool / Command | Result |
|---|---|---|
| Show Mounts | showmount -e <target> | List NFS exports |
| Mount Share | mount -t nfs <target>:/share /mnt/nfs -o nolock | Mount NFS share |
Notes
Always start with full port scan: `nmap -sV -sC -p- <target>`.
Check for default credentials before brute-forcing.
Use service-specific NSE scripts: `nmap --script <service>-* -p <port> <target>`.
Remember to check both IPv4 and IPv6 if applicable.
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References