fingerprintx

FeaturesInstallationUsageRunning fingerprintxWhy not nmap?NotesAcknowledgements

fingerprintx is a utility similar to httpx that also supports fingerprinting services like as RDP, SSH, MySQL, PostgreSQL, Kafka, etc. fingerprintx can be used alongside port scanners like Naabu to fingerprint a set of ports identified during a port scan. For example, an engineer may wish to scan an IP range and then rapidly fingerprint the service running on all the discovered ports.

Features

  • Fast fingerprinting of exposed services
  • Application layer service discovery
  • Plays nicely with other command line tools
  • Automatic metadata collection from identified services

Fingerprintx Example

Fingerprintx Chain Example

Fingerprintx SMB Example

Supported Protocols:

SERVICE TRANSPORT SERVICE TRANSPORT
HTTP TCP REDIS TCP
SSH TCP MQTT3 TCP
MODBUS TCP VNC TCP
TELNET TCP MQTT5 TCP
FTP TCP RSYNC TCP
SMB TCP RPC TCP
DNS TCP OracleDB TCP
SMTP TCP RTSP TCP
PostgreSQL TCP MQTT5 TCP (TLS)
RDP TCP HTTPS TCP (TLS)
POP3 TCP SMTPS TCP (TLS)
KAFKA TCP MQTT3 TCP (TLS)
MySQL TCP RDP TCP (TLS)
MSSQL TCP POP3S TCP (TLS)
LDAP TCP LDAPS TCP (TLS)
IMAP TCP IMAPS TCP (TLS)
SNMP UDP Kafka TCP (TLS)
OPENVPN UDP NETBIOS-NS UDP
IPSEC UDP DHCP UDP
STUN UDP NTP UDP
DNS UDP

Installation

From Github

go install github.com/praetorian-inc/fingerprintx/cmd/[email protected]

From source (go version > 1.18)

$ git clone [email protected]:praetorian-inc/fingerprintx.git
$ cd fingerprintx

# with go version > 1.18
$ go build ./cmd/fingerprintx
$ ./fingerprintx -h

Docker

$ git clone [email protected]:praetorian-inc/fingerprintx.git
$ cd fingerprintx

# build
docker build -t fingerprintx .

# and run it
docker run --rm fingerprintx -h
docker run --rm fingerprintx -t praetorian.com:80 --json

Usage

fingerprintx -h

The -h option will display all of the supported flags for fingerprintx.

A utility for service fingerprinting

Usage:
  ./fingerprintx [flags]

Flags:
      --csv               output format in csv
  -f, --fast              fast mode
  -h, --help              help for ./fingerprintx
      --json              output format in json
  -l, --list string       input file containing targets
  -o, --output string     output file
  -t, --targets strings   target or comma separated target list
  -w, --timeout int       timeout (milliseconds) (default 500)
  -U, --udp               run UDP plugins
  -v, --verbose           verbose mode

The fast mode will only attempt to fingerprint the default service associated with that port for each target. For example, if praetorian.com:8443 is the input, only the https plugin would be run. If https is not running on praetorian.com:8443, there will be NO output. Why do this? It’s a quick way to fingerprint most of the services in a large list of hosts (think the 80/20 rule).

Running Fingerprintx

With one target:

$ fingerprintx -t 127.0.0.1:8000
http://127.0.0.1:8000

By default, the output is in the form: SERVICE://HOST:PORT. To get more detailed service output specify JSON with the --json flag:

$ fingerprintx -t 127.0.0.1:8000 --json
{"ip":"127.0.0.1","port":8000,"service":"http","transport":"tcp","metadata":{"responseHeaders":{"Content-Length":["1154"],"Content-Type":["text/html; charset=utf-8"],"Date":["Mon, 19 Sep 2022 18:23:18 GMT"],"Server":["SimpleHTTP/0.6 Python/3.10.6"]},"status":"200 OK","statusCode":200,"version":"SimpleHTTP/0.6 Python/3.10.6"}}

Pipe in output from another program (like naabu):

$ naabu 127.0.0.1 -silent 2>/dev/null | fingerprintx
http://127.0.0.1:8000
ftp://127.0.0.1:21

Run with an input file:

$ cat input.txt | fingerprintx
http://praetorian.com:80
telnet://telehack.com:23

# or if you prefer
$ fingerprintx -l input.txt
http://praetorian.com:80
telnet://telehack.com:23

With more metadata output:

$ cat input.txt | fingerprintx --json
{"host":"praetorian.com","ip":"146.148.61.165","port":80,"service":"http","transport":"tcp","metadata":{"responseHeaders":{"Connection":["keep-alive"],"Content-Type":["text/html"],"Date":["Mon, 19 Sep 2022 18:37:55 GMT"],"Etag":["W/\"5e3e263f-1703\""],"Keep-Alive":["timeout=20"],"Server":["nginx"],"Vary":["Accept-Encoding"]},"status":"404 Not Found","statusCode":404,"version":"nginx"}}
{"host":"telehack.com","ip":"64.13.139.230","port":23,"service":"telnet","transport":"tcp","metadata":{"serverData":"fffb03"}}

Why Not Nmap?

Nmap is the standard for network scanning. Why use fingerprintx instead of nmap? The main two reasons are:

  • fingerprintx works smarter, not harder: the first plugin run against a server with port 8080 open is the http plugin. The default service approach cuts down scanning time in the best case. Most of the time the services running on port 80, 443, 22 are http, https, and ssh — so that’s what fingerprintx checks first.
  • fingerprintx supports json output with the --json flag. Nmap supports numerous output options (normal, xml, grep), but they are often hard to parse and script appropriately. fingerprintx supports json output which eases integration with other tools in processing pipelines.

Notes

  • Why do you have a third_party folder that imports the Go cryptography libraries?
    • Good question! The ssh fingerprinting module identifies the various cryptographic options supported by the server when collecting metadata during the handshake process. This makes use of a few unexported functions, which is why the Go cryptography libraries are included here with an export.go file.
  • Fingerprintx is not designed to identify open ports on the target systems and assumes that every target:port input is open. If none of the ports are open there will be no output as there are no services running on the targets.
  • How does this compare to zgrab2?
    • The zgrab2 command line usage (and use case) is slightly different than fingerprintx. For zgrab2, the protocol must be specified ahead of time: echo praetorian.com | zgrab2 http -p 8000, which assumes you already know what is running there. For fingerprintx, that is not the case: echo praetorian.com:8000 | fingerprintx. The “application layer” protocol scanning approach is very similar.

Acknowledgements

fingerprintx is the work of a lot of people, including our great intern class of 2022. Here is a list of contributors so far:

GitHub

View Github