Questions tagged [ports]
In computer networking a port is a software construct serving as a communications endpoint in a computer's host OS.
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Difference Between Exploit Kits Vs. Probing a Network for Vulnerabilities
I don’t understand exactly the difference between websites using exploit kits on visiting users vs. a website server probing a network for vulnerabilities and then exploiting them.
The scenario is ...
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lsof -i and nmap output different [migrated]
To test my PostgreSQL, I had to find its port number.
I ran two different commands to see what it is:
nmap localhost
lsof -i | grep postgres
I was confused when the two commands returned different ...
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Is someone accessing my win10 computer?
I have been wondering if someone is accessing my system and after doing using some basic assessment tools like netstat and event viewer, found some unusual open ports(12345) and special Logon! below ...
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4
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How can non-root intercept privileged loopback ports?
Please walk through how an attacker can intercept Chrome's connection to 127.0.0.1:999, as suggested by the warning below.
This warning is consitently displayed across many versions of Chrome in many ...
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Scan for open ports on subdomain
I am curently scanning for open ports on a subdomain. Say I have example.com and subdomain.example.com, but this subdomain can only be reached at port 8443. How can I scan for other potential open ...
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2
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Does AWS security group block unintentionally exposed ports from Docker?
My typical cloud server hardening includes blocking ports at the UFW level on the server as well as at the AWS security group level.
I recently learned that Docker overwrites your IPTables. Given that,...
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Does Label Distribution Protocol (LDP) on port 646 need to be open to the Internet? What are the risks associated with it?
I am a security engineer trying to understand the risks of having LDP exposed to the Internet on port 646. I cannot find much information available on the Internet documenting this. Any information ...
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754
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Best port to setup Outline VPN for obfuscation
Many outline access keys use a random port but some do 443, I’ve found out since port 443 is for http its harder to find out that port is using a vpn.
So the question is, why don’t other Outline ...
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How to confirm what service is running on a port identified by nmap?
Probing with nmap returns BlackICE on a couple of ports however it seems to be a really old tool according to these manuals.
Starting Nmap 7.80 ( https://nmap.org ) at 2022-10-16 20:27 EDT
Nmap scan ...
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How can I port scan my p2p device?
I have a device and I am trying to port scan it. I did the basic
nmap -A -p0- 192.168.0.x
but I am just getting
0/tcp filtered unknown
so I don't think it is working. The device works on p2p so I am ...
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Prevent Discovery of Port from NMAP scan using -Pn
Is there a way to prevent a port from being discovered by nmap? I found that port 1433 is still being flagged as "open" when using the following command:
nmap <ip_add> -Pn -p1433
or
...
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2
answers
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Web application discovery: Can there be virtual hosts configured even when there is a response without host header?
I'm currently learning how to discover web applications running on a machine using port scanning, vhost bruteforcing and directory fuzzing. When it comes to port scanning, there is one thing I can't ...
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Deploy to Digital Ocean droplet from Github Action - Should I leave the SSH port open for future deployments?
I'm going to a deploy a web app (angular static frontend and node backend in docker) to digital ocean droplet. Deployment is done from Github Action by essentially loging via SSH to the droplet and ...
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4
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Benefits of non-standard SSH port when password authentication is turned off
Is there any benefit of using a non-standard SSH port when PasswordAuthentication is turned off in sshd?
The only benefit of non-standard SSH ports I know of is a reduction of the amount of brute ...
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2
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206
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Windows IP Helper service listening on port 1000
On a Windows 10 Home machine (21H2 19044.1741), I noticed one of my applications failed to listen on port 1000, because something was already using that port. That struck me as peculiar, because I ...
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nmap scanning Raspbian with strange results
I'm a high schooler in a CyberDefense Class and we are learning to PenTest.
I'm on Red Team and my teacher set up a system with Rasbian as the OS. When I run a scan on the computer scanning the Top ...
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Are there security implications of allowing Discord through Windows Firewall?
I just installed Discord (downloaded from the official Discord website) and after the install a Windows Firewall pop-up appears asking me if I want to allow Discord through Windows Firewall.
I don't ...
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Why is Nessus report HTTP running a web server on port 80 when I'm sure that it isn't?
From a Nessus scan I have the following output regarding HTTP and the use of port 80:
Info N/A 43111 HTTP Methods Allowed (per directory)
Info N/A 24260 HyperText ...
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1
answer
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What is the security impact to using a port different from 443 for HTTPS in my router
Are there any advantages or disadvantages for the security when using a non-standard port (i.e. not 443) for HTTPS in my router?
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How to evaluate a responsive but unknown network protocol?
I am studying CREST CPSA where the syllabus is listed here.
There is a part of the syllabus which states I should know the Evaluation of responsive but unknown network applications.
I find this ...
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Disguising Device Information During IP and Open Port Scans
I am getting into the field of penetration testing and had a question about device information scans. I know that you can scan all of the devices on a network and scan for open ports, and in the ...
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1
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How much network noise is normal? [closed]
on my Ubuntu VPS I am getting a lot of requests and portscans from foreign sources. They are all blocked by UFW. However my question is, if this much "network noise" is normal or is my ...
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Why when i nmap scan a machine i get the port 554 (RTSP) open?
I train on vulnerable boxes and during my recon phase, I use nmap to collect info on open ports.
I use the command nmap -sS [IP|URL] and no matter the machine, I get the result that port 554 - RTSP ...
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Is it possible to spoof a service running on a port in Ubuntu?
I was looking into the idea of port spoofing, and I came across this
GitHub repository. I'm mainly looking to disguise my computer as something else, whereas this program opens every TCP port and ...
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What are the drawbacks of a stealthy port scan?
I read that port scanning services like nmap will conduct a "TCP Connect Scan". They'll attempt to make a TCP connection to each of the ports within the range provided. But because each of ...
- 113
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Mixed results from different port scanners - stealth vs closed
I did some port scanning of the local network, as a bit of security due diligence, expecting the first 1000 to be stealthed. However, the results are mixed, when running the scan with different ...
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1
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111
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ec2 instance insecure to allow ssh to any ip address
I have a linux instance deployed on AWS EC2.
Sorry for my dumb question, but I'll ask anyways just to be safe.
Q1. While creating an instance, I set anyone 0.0.0.0:0 for the ssh. Though, on the next ...
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3
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379
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Why would a legitimate application run on a non-standard port?
Among the many "threats", I see on my SIEM, a non-standard port is a top one. It's always been a false positive, but I don't understand why this happens frequently?
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How to configure Snort 3 to detect nmap's port scanning? [duplicate]
How to configure snort 3 to detect nmap's port scanning? For instance I want to know that an external machine A is looking with nmap for open ports on my machine B.
Such a port scan can include all ...
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120
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Selection of port for HTTPs based URL
I have an application and it will be exposed to HTTPs based URL. I want to put a port explicitly. So if I do I can select 8443 port.
https://<IP_ADDRESS>:8443/myApplication
If I don't put a ...
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Router scanning ports on all connected devices
From time to time, my router starts to scan ports on all the connected devices. I have an internal RPi server which I restricted its access to the internet from the router. I checked the "/var/...
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3
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Nmap shows different results when connected to VPN [closed]
I am trying to determine why nmap would show different results when I am connected to a VPN service.
When I am connected to Nord VPN, it shows two additional ports which do not seem to be open.
No VPN
...
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1
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How can you attack or redirect the client from the server over an RDP or SSH conneciton? [closed]
I have a penetration testing scenario where I am on the network with two machines, Machine A and Machine B. I have complete control over Machine B and am trying to leverage that to get access to ...
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1
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246
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How do I differentiate a DDoS attack from a DoS attack?
My server is under attack on an specific port but I am confused whether is a DDoS attack or a DoS attack (if it requires a botnet or is using some kind of trick). The entire server is available (...
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657
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How to check if my ports are exposed to the internet
[Crossposting from SO]
I am trying to make a port scanner in Python and trying to list which all ports are accessible by anyone remotely.
Using the socket.connect_ex package, I was able to check which ...
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1
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What is insecure about the "insecure" option of NFS exports?
Why is it considered insecure for an NFS export to allow connections originating from high ports? Compare the manual:
exportfs understands the following export options:
secure
This option requires ...
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2
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382
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If HTTPS only runs on a single port, why is SYN flooding an issue?
I've read online that SYN flooding is when "the attacker sends repeated SYN packets to every port on the targeted server." However, HTTPS only runs on port 443. Therefore, why is it ...
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1
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206
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Change ettercap default port
Guys does anyone know how I can change the port that ettercap runs? I need it to run on port 8080.
When I try to run sudo ettercap -G it presents me with this error:
ERROR : 13, Permission denied
[/...
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Closed Port on Metaspoilt framework [closed]
I run Kali Linux OS on my PC and I use the Metasploit Framework. But I'm unable to access any ports when I run sudo netdiscover it always outputs that all ports are closed, even though Metasploit has ...
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1
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Do you have to be on the same WIFI for a Buffer Overflow attack to work?
I know how Buffer Overflows work but in order to do them do you have to be on the same WIFI as your victim. You need to send a packet to a specific device on a specific port. Therefore, unless port ...
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3
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Is there a way to close 22 SSH port from public, ubuntu?
I am using putty and private key to access my development server. I used Nmap to see which ports are visible to the public, and in fact the 22 is open.
Is it possible to hide open port from the public?...
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Docker container exposed port vulnerabilities on Debian server?
I'm configuring a Debian (Stretch) webserver to run docker containers for socks requests. So, the application would be able to authenticate (on port 1080) with the Dante server running inside the ...
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1
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129
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Estimate the number of host computers on the private network by port scanning
If we have a private network connected to the Internet with NAT, how can an attacker estimate the number of host computers in network using port scanning?
For both possible modes, the attacker inside ...
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Security implications of granting non-root access to privileged ports (<1024)
Lots of solutions to this problem e.g. here and here but in order to decide which is best I'd need to know more about the security implications of each solution (or at least in general).
My context: I'...
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1
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What is the threat/risk difference in opening multiple ports on one physical NIC on a home server vs creating VLANs and opening ports on each VLAN?
I have a single home server with a single NIC. I intend to run numerous services -- some will be internet exposed, some will not. I don't know if I am going to run them as VMs or Docker container but ...
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232
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What's this port? [closed]
Listing all the ports currently in use on my mac running $ sudo lsof -i -n -P | grep TCP, I see six entries starting with a weird-looking string of "2BUA8C4S2".
A web search for that string ...
2
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1
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911
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scan forwarded ports with OpenVAS/GVM?
I'm currently learning about network security and came across a problem, maybe I'm just missing something obvious but I'll try to explain my environment:
I have a Kali Linux VM connected to the WAN ...
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1
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Intensive 586 (ms-shuttle) port scan/exploit/hacking attempts
Recently i wanted to play a bit with TCP/UDP networking (and touch some custom HTTP server impl) on C# and found out that i'm getting requests from totally unknown dudes, such as this one:
FROM: [::...
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0
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Is port scanning used by software for legitimate reasons?
Does normal network traffic sent out by software or anything else use port scanning for legitimate reasons?
I'm using psad on my linux server and am unsure if setting the auto-ban IP feature on danger ...
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2
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What are the advantages of port scanning?
It seems like all the google results to this question answer what port scanning is, but go into little detail about how a pentester or hacker could use the information about what ports a network has ...
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