Security scanner for computers and networks.

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Nmap's options beginning with P [migrated]

Recently, I've been learning details about nmap scanner, with the help of tcpdump and wireshark. In order to find underlying behavior on nmap, I specified a dummy port 9527 and a command line like ...
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2answers
53 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 ...
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2answers
299 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?
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0answers
29 views

honeypot configuration (honeyd) - finding attack [closed]

I want to config a local honeypot to find some attack, to do this I have installed honeyd on Ubuntu12.04.4 which is installed on my vmware. here is my config file: ### Linux Suse 8.0 template create ...
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4answers
70 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 ...
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2answers
42 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?
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1answer
65 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 ...
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1answer
32 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 ...
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1answer
75 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 ...
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1answer
53 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?
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141 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 ...
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2answers
95 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 ...
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1answer
71 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 ...
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0answers
30 views

WPA2 ENTERPRISE - Unable to find a way around Lanner Electronics

Gday, 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 ...
1
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2answers
117 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 ...
7
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2answers
397 views

How nmap guesses the operating system?

nmap has the capability to guess the operating system with the option -O. I was highly surprised that it can find the correct kernel or service pack. * How nmap guesses the operating system? * What ...
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2answers
79 views

nmap crashing embedded-system in strange way

I'm trying to find out what nmap-commands crash an embedded-system. In the process I can see behaviour that I don't understand: On the system port 80 is open and 79 is closed. nmap -p 79-80 -T5 -A ...
5
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1answer
200 views

Where can I use the TCP FIN scan?

For a coursework i've got to run the various port scans, i'm having trouble with the FIN scan though, I can't seem to find a system where I can try it, everywhere I try it all ports either come back ...
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2answers
2k views

Is it possible to identify who's behind a nmap -D scan?

Nmap's -D option stands for decoy, which means that the attacker can simulate that the attack is coming from multiple IPs, including attacker's IP. From the point of view of the victim, is it ...
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2answers
81 views

viability scanner inside AWS

So I have 2 soon to be 3 VPC's within AWS, I want to run a automated nmap scan on all three VPC's every few weeks to make sure nothing has been opened, added etc what would be the best way to achieve ...
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2answers
125 views

Does Nmap requires a closed TCP port to do OS fingerprinting?

I was checking the security of a server by running Nmap. Last time it gives me the following results, indicating that OS could not be fingerprinted: PORT STATE SERVICE VERSION 21/tcp ...
2
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2answers
132 views

Nmap scanning computers behind a wireless modem [closed]

Let's suppose that I have a router and three computers connected to Internet through that router. When I tried to get the external IP address for each computer, I got the same address. I think this ...
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1answer
107 views

nmap - “No exact OS matches for host (test conditions non-ideal)” even with 1 open, 1 closed port

I'm trying to do some Nmap OS detection and I'm running into some results I don't understand. The scan I'm running is the following: nmap -O -F -v -T2 -oA nmap-uphosts-OSdetect -iL < my_in_file ...
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0answers
390 views

Proxychains + nmap = segmentation fault

If I try the sV (service detection) flag in nmap run via proxychains (socks5 server) it appears to give me a segmentation fault message:- root@kali:~# proxychains nmap -n -sT -Pn X.X.X.X -p ...
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1answer
49 views

Is there any difference for OS fingerprint technique used in Nmap inside -A and -O?

Is there any difference between the technique or algorithm used from Nmap to guess the OS between the option -A and -O? If not, why -O option requires root privileges but -A that it is doing at least ...
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2answers
979 views

How to block network scans with pfsense?

I am using pfsense as firewall, and I would like to know how I can stop network scans from enumerating open services and ports. Thanks
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2answers
185 views

Identifying HP Printers with NMAP and then using results in Python/Perl

Great write up on network printer hacking at IronGeek's site here for anyone interested http://www.irongeek.com/i.php?page=security/networkprinterhacking. Here's what I want to do: Scan the subnet ...
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2answers
133 views

Nmap stealth scan shows that port is filtered

The title is really bad, but I was able to find better. I have installed Debian on VMware, and set iptables to block any traffic except port 80 (inbound and outbound). When I run a nmap scan it shows ...
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1answer
88 views

NMAP not reporting open ports with -sS scan

Is there any reason why an -sS scan (or most others) would not report an open port that doesn't have a service attached to it? For example, in a regular -sS scan, the following port will be missing, ...
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1answer
89 views

How to create a script that returns only the mobile devices on a network using NMAP

I would like to create a script using NMAP on Mac that 1) scans the entire LAN, and 2) Returns the number of mobile devices.
1
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1answer
81 views

Can't successfully do an idle scan

I have kali linux installed in VirtualBox and would like to do an idle scan. For this I need to find a suitable zombie pc. I'm using the ipidseq script to find one. The script finds some ip addresses ...
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3answers
288 views

What exactly does one get from a Nmap Scan?

I know nmap is a port scanner and its output shows all the open ports, the services running on those ports, the underlying OS and technology, etc. What should one take from this result in easiest ...
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98 views

Nmap reporting the status of a port as both opened and closed

If I do not define any range (or if the range is large like a hundreds of ports), Nmap is returning ports as opened. However, if I put a smaller range or just scan a specific port, it says it's ...
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0answers
342 views

Testing Basic Authentication with ncrack

I'm conducting some basic pen testing against a page protected with Basic Authentication. I've sucessfully tested with Medusa and Hydra but am struggling to get the syntax correct for ncrack. the ...
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1answer
70 views

If I port scan a server on the outside of a firewall will this also tell me the ports the firewall is blocking?

Theoretically I was thinking a firewall inspects the TCP header and looks at the destination port and discards/forwards based on its firewall rules. So could I port scan an external server to the ...
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1answer
1k views

how to bypass windows xp firewall with nmap

I'm scanning a Windows XP in a virtualized environment. I use all of needed arguments to bypass its firewall but it doesn't answer: nmap -e eth0 -Pn --data-length 5 --badsum -g 80 -S 192.168.1.103 -f ...
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1answer
1k views

Nmap SSL service detection: How to check all open ports only for SSL service?

I am running nmap to probe services that use SSL.ยน In order to detect vulnerability in non-standard ports, I am using the -sV option to perform service discovery. But it is very slow since it runs ...
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1answer
316 views

Scan All private subnets with NMAP [closed]

I have a managed switch on my network but I don't remember the subnet. How can I scan all the private network without changing my ip address : 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16 Thanks for ...
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4answers
189 views

Comprehensive audit of firewall - is Internet truly not accessible?

We have many Linux servers in several co-locations over the world. By design, these machines generally should not be able to access the Internet. Depending on location and role, some sites may have ...
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4answers
1k views

Increase speed in nmap UDP scan?

How can I get nmap quicker in scanning UDP ports? This kind of scan is incredibly more slow than TCP ports (at least 2-3 times)
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1answer
64 views

Optimal flags to specify when using nmap to guess the OS on remote devices?

Optimal flags to specify when using nmap to guess the OS on remote devices? I'm currently using the following: nmap --privileged -sS -sU -sY -sZ -O --osscan-guess -F -r 192.168.200.223 This seems ...
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1answer
2k views

How do I use nmap to scan a range of IPv6 addresses? [closed]

I need to scan a range of IPv6 addresses with Nmap, but I'm not sure how to do this. When scanning for an IPv4 range, I would usually do this: nmap -sP 192.168.*.* or nmap -sP 192.168.1.* but if ...
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2answers
1k views

Why do multiple IP Addresses in my local network point to the same computer?

I'm new to linux and nmap, and I am attempting to do a scan of my local network. Using nmap I find that there are 4 hosts on my network (10.0.2.2, 10.0.2.3, 10.0.2.4, 10.0.2.15). I am using VirtualBox ...
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2answers
2k views

nmap no ping returns host is active and all ports are filtered

I am trying to determine if hosts are up. For hosts where a ping fails, I run a nmap (6.40) Regular and/or Quick scan. For a subset of my hosts, the nmap response is "Host seems down". As a follow up ...
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0answers
261 views

Bypass Nmap Scans Being Blocked [closed]

A friend has set up a VM for me to play with, I am currently stuck on a little problem: On this network he set up, there are 6 machines and a router, 5 servers (plus the router) show up on a typical ...
3
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1answer
124 views

Use nmap correctly

I currently have a VPS in a data center, I asked the admin to open a port to install a ftp server. It opened port 3345, at first I tought the port is not forwarded correctly, because I ran nmap as ...
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1answer
568 views

Import nmap scan results into OpenVAS

I have recently been introduced to OpenVAS for scanning our network at work. I am familiar with nmap, and I am happy with it's performance when used stand-alone from the cli, through iptraf I can see ...
2
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1answer
81 views

Does nmap limit probes when using time limiting on decoy scans?

If I set a rate limit (e.g. -T1) on an nmap scan that uses decoys, does the rate limit apply to all probes, or just each individual source? I checked the documentation, but can't see anything ...
3
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2answers
395 views

Determing live hosts past a restrictive firewall with nmap

Sometimes when I am doing an external security assesment, I run into hosts that have the following restrictions/configuration: All ICMP traffic is blocked An IDS or some device returns all ports as ...
3
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5answers
2k views

Nmap reporting almost every port as open

I have noticed during some assesments when doing a TCP port scan, Nmap will report almost every port as open for a machine. Using for example nmap -sS -PN -T4 target -p0-65535, over 20,000 ports will ...