advanced nmap_ nmap script scanning

7/29/2019 Advanced Nmap_ NMap Script Scanning

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Advanced Nmap: NMap Script ScanningBy Rajesh Deodharon April 1, 2011 in How-Tos, Sysadmins, Tools / Apps 0 Comments

Inprevious articles, we have studied NMap in greatdetail, including live scanning

a firewallandverifying the recommendations. Now, its time to study NMap

script scanning.

Nmap.orgdescribes the Scripting Engine (NSE) is one of Nmaps most powerful and flexible

features. It allows users to write (and share) simple scripts in the Lua programming language, to

automate a wide variety of networking tasks. Those scripts are executed in parallel, with the

speed and efficiency you expect from Nmap. Users can rely on the growing, diverse set of scripts

distributed with Nmap, or write their own to meet custom needs.

To my amusement, Nmap features are growing day by day. It was introduced just as a port

scanner, and now it has reached a stage where you can even use it for basic vulnerability

analysis. The vulnerability (script) database is increasing day by day, version by version.

Precisely 177 scripts are available with version 5.50, which is the latest NMap release.

Before script-scanning networks, lets try to understand a few ready-made scripts that let us

detect various vulnerabilities in the network and devices at one go, in a very short time. Please

remember, once you find vulnerabilities, you should immediately take corrective action to close

them. These corrective measures may be as simple as changing passwords, disabling unused

accounts, or as time-consuming and crucial as applying security patches or removing detected

worms.

Table 1: Some use ful Nmap scripts

No. Script Function

1. dhcp-

discover

Discovers DHCP servers on the network; the UDP discover request is

sent from port 67, and the response is received on port 68.

2. ftp-

bounce

Checks whether there are FTP servers that allow an FTP bounce attack

to other hosts on the network. (Please refer to earlier articles, where wehave discussed FTP bounce attacks.)

3. http-iis-

webdav-

vuln

Checks whether hosts with vulnerabilities listed in Microsoft security

bulletin MS09-020 (IIS 5.1/IIS 6.0) are present on the network.

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4. ms-sql-

info

Identifies Microsoft SQL Server details.

5. mysql-

info

Identifies MySQL Server details.

6. p2p-

conficker

Checks whether a host is infected by the conficker.c worm.

7. smb-enum-

shares

A very interesting script, which identifies all SMB shares within the

specified address range.

8. smb-enum-users

Will identify all SMB user names within the specified address range.

9. sniffer-

detect

Finds hosts with pcap libraries installed.

10. sshv1 Lists all hosts with SSH version 1. As most of you will be aware, this

version has documented vulnerabilities.

The various command line options for script scanning are as follows:

-sC basic script scan

--script-updatedb will update the script database.

Some of the scripts may ask for the --script-args=unsafe option to be set to 1. Pleaseremember, this is a destructive test; these scripts will almost surely crash a system with the

corresponding vulnerability. Be careful you do not use this option in a live production

environment.

The actual scans

To start with, create a file IPList.txt, listing all the active hosts on the network, to specify

target hosts to Nmap. Next, try to analyse the results of a few scans performed in a live

environment. When you wish to try these scans, dont forget to take written permission from the

management.

Checking for SSHv1

Table 2: sshv1 scan

Command/details Explanation

nmap-script sshv1 -iL

IPList.txt -osshv1.txt

The command line, running only one script, sshv1.

Masked output of sshv1.txt:

Nmap scan report for 192.168.1.4

Host is up (0.00011s latency).

Not shown: 984 closed ports

The output identifies that a host with IP address

192.168.1.4 is running SSHv1.

On further probing, the host identified it to be

running a very old version of Red Hat Linux.

Recommendation: Upgrade SSHv1 to the latest

version.

Sniffer detection

Table 3: sniffer-detect scan


nmap-script sniffer-detect

-iL IPList.txt -osniffer-

detect.txt

Initiating sniffer detection

Masked output of sniffer-detect.txt

Nmap scan report for

192.168.1.26


The detection of host 192.168.1.26 informs you that it

is running Windows, with libpcap installed. It further

states that the sniffer may not be sniffing.

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PORT STATE SERVICE21/tcp open ftp

22/tcp open ssh|_sshv1: Server supports SSHv180/tcp open http111/tcp open rpcbind113/tcp open auth

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MAC Address: 00:XX:XX:XX:XX:2D

(Intel Corporate)

Host script results:

|_sniffer-detect: Windows with

libpcap installed; may or may not

be sniffing (tests: 1_1___1_)

After discussion with the management, it became clear

that for testing their environment, pcap libraries were

indeed installed on this host.

smb-enum-users

This is a very interesting script. In one go, you can identify all the users present on the entire

network, and their status. You may wish to identify which of them have left the organisation, and

disable/delete the corresponding account, as per company policy.

Table 4: smb-enum-users scan


nmap-script smb-enum-users -iL

IPList.txt -osmb-enum-users.txt

To scan all hosts listed in IPList.txt for

SMB users

Masked output of smb-enum-usrs.txt

Nmap scan report for 192.168.1.109



MAC Address: 00:XX:XX:XX:XX:04 (G-pro

Computer)

Host script results:

Though the scan was performed on a

live installation, to preserve

confidentiality, the company name and

user names are masked.

When the script result was shown to

TESTCOMPANY management, they

were shocked to see active accounts of

many past employees! Suspending all

further tests and network audits, they

first disabled the unwanted accounts.

The power of NMap script scans doesnt end here. By using various scanning options, you can

run combinations of various script categories (SMB scans, HTTP scans, etc) at one go.

References and further reading

Lua programming language

Listing of NMap scripts

PORT STATE SERVICE135/tcp open msrpc139/tcp open netbios-ssn445/tcp open microsoft-ds2967/tcp open symantec-av5101/tcp open admdog5225/tcp open unknown5226/tcp open unknown8008/tcp open http

PORT STATE SERVICE135/tcp open msrpc139/tcp open netbios-ssn445/tcp open microsoft-ds1000/tcp open cadlock1145/tcp open unknown1720/tcp open H.323/Q.9312401/tcp open cvspserver2967/tcp open symantec-av5060/tcp open sip5061/tcp open sip-tls5101/tcp open admdog

| smb-enum-users:| TESTCOMPANY\A--------y (RID: 1228)

| TESTCOMPANY\accounts_user (RID: 1125)| TESTCOMPANY\Administrator (RID: 500)| TESTCOMPANY\a---------r (RID: 1168)| TESTCOMPANY\a---------g (RID: 1224)| TESTCOMPANY\a---------r (RID: 1122)| TESTCOMPANY\A---------D$ (RID: 1249)| TESTCOMPANY\a---------e (RID: 1199)| TESTCOMPANY\A---------r (RID: 1231)| TESTCOMPANY\a---------e (RID: 1186)| TESTCOMPANY\A---------S$ (RID: 1218)| TESTCOMPANY\A---------S2$ (RID: 1227)| TESTCOMPANY\c---------r (RID: 1120)| TESTCOMPANY\c---------r (RID: 1120)| TESTCOMPANY\cvsserver$ (RID: 1176)| TESTCOMPANY\d---------e (RID: 1174)| TESTCOMPANY\d---------y (RID: 1212)
http://nmap.org/nsedoc/http://lua.org/manual/


4/5

Rajesh Deodhar

The author is BE (Industrial Electronics), CISA (Certified Information

Systems Auditor) and DCL (Diplom a in Cyber Law). He has m ore than 15

years of experience in the field of computer hardware, networking,

firewalls and IS auditing. He is a director at Omega Systems and Services,

Pune.

Connect with him: Website

Related Posts:

Advanced Nmap: Scanning Firewalls Continued

Advanced Nmap: FIN Scan & OS Detection

Advanced Nmap: Scanning Techniques Continued

Advanced Nmap: A Recap

Advanced Nmap: Scanning Firewalls

Tags:Advanced Nmap Seri es, corrective action, corrective measures, dhcp servers, firewall, ftp servers, IP address, LFY April 2011,

Lua, MAC address, Microsoft SQL Server, Microsoft Windows, MySQL, network security, networking tasks, NMap, OpenSSH, p2p, port

scanner, Red Hat Linux, scripting, scripting engi ne, scripting l anguage, Security, security patches, TCP, UDP, unused accounts,

vulnerabilities, vulnerability analysis

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