Security scanner for computers and networks.

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2
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2answers
38 views

When should I drop a packet with ICMP type 3, code 9 or 10, TCP RST, or TCP ACK?

This answer says there are a few ways of dealing with a blocked packet at a firewall: At each of these levels a 1st IP packet (and any other protocol packet as an ESP or AH packet) might receive ...
8
votes
4answers
1k views

Filtered ports - What exactly filters them?

By the NMAP definition, unfiltered ports are the ones which cannot be determined to be open or closed since packet filtering prevents its probes from reaching the port. (ISBN 9780979958717 pag. 77) ...
1
vote
2answers
37 views

If I write an nmap job into crontab from PHP code to run background, how can I get the status of the nmap cronjob?

I am trying to write a php code test to write an nmap scan (with parameters) scheduled into crontab file. While the nmap is running I would like to get the status of that specific nmap scan. For ...
1
vote
1answer
31 views

NMap for getting machines connected to a network switch [duplicate]

I am currently exploring Nmap for its capabilities. Can anyone tell how can Nmap be used to query the machines connected to a network switch?
1
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0answers
50 views

'http_login' metasploit module isn't able to Brute Force the target. Any suggestions? [closed]

I'm trying to Brute force the http Basic authentication on the domain pentesteracademylab.appspot.com The complete path is pentesteracademylab.appspot.com/lab/webapp/basicauth I'm using the ...
3
votes
2answers
50 views

Scanning multiple subnets with nmap to determine open services & ports

First off, I know nmap's documentation is very powerful and I have been reading through it rather extensively. I will be scanning externally, with permission, to determine ports & services that ...
-1
votes
2answers
75 views

Client misunderstanding nmap [closed]

My client wants their public facing IP addresses to be secure, but thinks that running nmap port scans will draw attention from hackers. To settle this once and for all, what do you say?
1
vote
3answers
113 views

How can I scan open ports through Windows Firewall?

I use Kali Linux and VMWare for testing some penetration techniques. The problem is that when I scan ports with Nmap to my Windows IP "all ports are filtered". I know that the firewall is blocking the ...
6
votes
1answer
148 views

What is the purpose of using different DNS server in nmap?

nmap allows the use of different DNS servers (not local). What is the benefit of doing so?
2
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2answers
122 views

nmap detects opened port but can't connect with telnet

I've made an scan to one single IP with nmap and it reports that the port 65301 is opened, and even it detects that it's maybe the service pcanywhere. sudo nmap -p 65000-65535 -sV x.x.x.x Starting ...
2
votes
1answer
60 views

explanation of an nmap behaviour

I'm testing some vulnerabilities on a machine which has the port 22333 opened (it's used as the ssh port, and I can connect to it without any problem and the telned command get connected): $ telnet ...
0
votes
2answers
89 views

Effective NMAP scan technique

I need to scan large network which has 5000 IPs. I have limited time duration. I have done initial maths and concluded that, in a group of 4 individual has to perform 70 IP nmap scan. Consider that I ...
2
votes
2answers
37 views

Any way to circumvent a 'filtered' response on NMap?

I know that a filtered response on NMap means that the firewall dropped the packets or that NMap just didn't receive a response, but is there any way to circumvent this? Is it possible that the ...
0
votes
1answer
54 views

Does nmap help to know if firewall is turned on?

Is it possible to know firewall status using nmap? How?
1
vote
2answers
91 views

NMap to scan a private subnetwork

I have a test network setup based on virtual machines. My host machine, a web server and the firewall is under the 192.168.0.0/24 network (gateway is 192.168.0.1); a server machine is located behind ...
3
votes
4answers
385 views

How to run nmap HTTP scripts on unusual ports

How can I make nmap run the HTTP-scripts on ports that are unusual for HTTP, say TCP port 123? On something like nmap -n --script="http* ..." -p123 target nmap does nothing except to check that port ...
1
vote
1answer
49 views

Caching ARP to avoid L2 detection on switched network?

Using nmap on a very large (/16) switched network can lead to an excessive number of ARP requests which can be detected by simple ARP counters listening to broadcasted ARP requests. Is there a way ...
2
votes
2answers
78 views

nmap script with credentials

I'm using Nmap for penetration testing for a while, and I need to know: assuming I revealed user credentials: username & password, Is there any script that I can use, for searching what resources ...
-1
votes
1answer
47 views

NMAP Scan- Results Differ

I'm trying to determine a servers IP address via ping and open ports/services by running an NMAP scan. At work, when I ping my website/server, I get a response from 172.16.XX.X If I run an NMAP scan, ...
4
votes
1answer
188 views

Firewalk through a Firewall on our subnet

Having trouble firewalking. I am trying to determine all the open ports on my firewall/gateway. Here is my lab network diagram: (Skip to the bottom of the following explanation for a direct list of ...
1
vote
1answer
67 views

NMAP Scan Returns Odd OS Detection [closed]

I am new to NMAP but I was using it to troubleshoot some issues I have been having. I ran a scan on a device and I know the device runs some sort of Linux or Ubuntu OS and I was attempting to figure ...
1
vote
1answer
176 views

proxychains-ng with nmap issues

Can anyone tell me if proxychains-ng has limitations to work with nmap? I found that it does not work well when using -sV option in nmap. (stop at "Initiating NSE at ..." and never finish the scan) ...
1
vote
1answer
158 views

nmap not running as root shows unknown open ports for a fraction of a second

On a server running Ubuntu 14.04.2 I was doing some basic security auditing when I ran the command nmap -p -d 1-65535 as a non-root user. Interestingly it reported a few (1-5 at a time, average, ...
2
votes
2answers
191 views

nmap says “variable 'keys' is not declared” when trying to run ssl-ccs-injection.nse

I'm running nmap 6.47 on Windows 7 and am trying to run the ssl-ccs-injection.nse script. After getting an error, I ran it with the -d (debug) option and the error in the subject is what showed up. I ...
5
votes
2answers
809 views

Why would a stealth scan attract more attention than a connect scan?

I'm reading an Information Security book and am faced with the question: Why may nmap stealth scans(SYN) attract more attention than simple connect scans(TCP connect())? Why might it be?
3
votes
2answers
162 views

Why does a nmap scan give different results depending on whether it's run from inside or outside a LAN

I am testing/setting up a Thompson TG585v7 router/firewall. Results when running nmap from a computer INSIDE the LAN $ sudo nmap -O 210.86.xxx.xxx Starting Nmap 6.40 ( http://nmap.org ) at ...
3
votes
2answers
186 views

If nmap reports a port is open, does that ALSO mean a service is listening on the port?

I have a Thompson TG585v7 router/firewall whose firewall is configured to FORWARD several ports to a computer X54 within the LAN. These ports are in the range 1024 through to 2500 That X54 ...
-4
votes
3answers
515 views

Can I do hacking using Windows OS? [closed]

I have searched the web a numerous times but haven't found an explicit answer to my question. I've studied (at school and on my own) computer networks for 2 years, doing active programming for 4 years ...
1
vote
1answer
130 views

What is the fastest way to scan all ports of a single machine

I am doing some research and I need a very quick way to scan for open ports on a single machine. To provide some context, I know that my machine will have a port open waiting for UDP packets for about ...
1
vote
0answers
58 views

Pathping for test Pinging from subnets

Does anyone know if PathPing or NMAP can ping or scan from predefinded source IPs? I am checking connectivity from agents on remote hosts to a destination site from my host. Is there a switch or tool ...
6
votes
3answers
1k views

What are the security issues of open ports?

What could be the threats of having the ports open, after performing a nmap scan and identifying the open ports? I already searched for some answers for this question, but couldn't find anything ...
2
votes
3answers
201 views

Printer IP scanning via Nmap

I want to scan printer IPs in my organization. Is there authentic method? I am using Nmap. I have already checked some commands like: 1) nmap -O 10.10x.x.0/24 -oG - | grep printer >> outfile ...
-2
votes
2answers
89 views

What's the difference between nmap -v and nmap -O?

As I'm a newbie in this, I'm unaware of the differences between making a scan using nmap -v localhost and nmap -O localhost? Any help would be appreciated.
3
votes
4answers
767 views

Is there a nmap command to get the top # most common ports?

I understand nmap by default scans the top 1k 'most common' ports (-F reduces to 100) I understand it gets these 'most common' ports based on the nmap-services file, specifically the frequency (3rd ...
2
votes
1answer
136 views

Understanding nmap output / author explanation …(Scapy)

I just read this example and explanation (below) in the OReilly book Security Power Tools (2007) in section 6.3 that is written by the creator of Scapy, Philippe Biondi. I think the example is very ...
1
vote
1answer
173 views

Why is nmap that slow on my system (ubuntu 14.04)?

I just started to learn something about portscanning with nmap. when i try to run an a nullscan or any other type on a virtual machine (win7 no firewall) the scan needs a lot of time to perform: ...
1
vote
2answers
748 views

What kind of vulnerability it may have for known ssh-hostkey?

I saw there is NSE script in nmap that can retrieve the ssh-hostkey(RSA or DSA) from the target host. For example, 22/tcp open ssh | ssh-hostkey: 2048 ...
-2
votes
2answers
434 views

Which all ports are in danger and needs to be closed with immediate attention?

This is the nmap scan results on my server (used for email and web serving) from a remote scan. Which all ports are in danger and why? PORT STATE SERVICE 21/tcp open ftp 25/tcp open ...
2
votes
2answers
478 views

How to force nmap to check all the ports?

I heard that nmap scans for only 1000 most common ports while we do server scan. Is it possible to force nmap to check all the ports for scanning? If yes,How?
0
votes
4answers
378 views

nmap mac os lots of questionable ports open

Ive been recently trying to lock down my network at home and suspect that someone has hacked my linksys router because port 3128 seems to be open through the router and I have no knowledge setting or ...
0
votes
2answers
315 views

different results using nmap with/without sudo

Why is the reason that after running $ nmap -sP 192.168.1.0/24 I got three results, but running $sudo nmap -sP 192.168.1.0/24 shows seven results. What is the role of using sudo here?
-3
votes
1answer
124 views

Is there scan-me-for-vulnerabilities services? [closed]

Where can I get more similar to nmap.online-domain-tools.com scan services. Edit: Probably, nobody know what does nmap.online-domain-tools.com is. I'm trying to explain: Network service. For ...
-2
votes
1answer
45 views

What does running nmap on a server reveal about your computer?

If you run the nmap command on a server eg. nmap espn.com or nmap -Pn espn.com what information does that reveal to the server about you (eg. ip address or MAC address)? Does using a private vpn ...
1
vote
1answer
222 views

Nmap from Kali Linux and from Amazon EC2 instance - vastly differing results

I'm running a basic scan using nmap from 1) a VM of Kali Linux running on personal machine 2) an instance of Amazon Linux, running on Amazon's EC2 cloud These two runs (against any target) are ...
-1
votes
1answer
119 views

What does “unknown” status in nmap mean? [duplicate]

scanned my IP number with nmap and I got all "unknown" status ports. What does that mean?
1
vote
0answers
801 views

What is my router listening for on ports 5555 and 3333? [closed]

I recently discovered nmap and pointed it at my router out of curiosity. It found that ports 3333 and 5555 are open but doesn't recognise either service. I investigated and found: I can successfully ...
2
votes
2answers
831 views

Why does NMAP scan list hosts as up? [closed]

When running an NMAP scan of my internal network (192.168.1.0/24) from my Mac, NMAP sees all hosts as live. It also believes there is a port 80 http service running on every IP when I do not have 254 ...
3
votes
1answer
205 views

Honeyd Isn't Detecting Loud Scans [closed]

I've got the Honeyd honeypot in one virtual machine (kali) and nmap in another (ubuntu), the config file looks like this: create default set default default tcp action closed set default default udp ...
1
vote
0answers
82 views

WPA2-Enterprise - unable to find a way around Lanner Electronics

I have currently been working in an environment where I am connected to a WPA2-Enterprise network requiring me to enter my username and password for the network whenever I connect. I have been asked ...
1
vote
2answers
170 views

Nmap scan list of domains and provide boolean if up/down

I have a newline separated list of domains that I would like to perform an arbitrary nmap scan on (e.g. aggressive, syn) and I would like to output a boolean that indicates whether or not any ports ...