Active4 years, 7 months ago
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 specific. Is there any particular issue with each and every port or are those threats common for all of them?
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3 Answers
An open port is an attack surface. https://newinfinity283.weebly.com/avast-for-mac-32-bit.html. The daemon that is listing on a port, could be vulnerable to a buffer overflow, or another remotely exploitable vulnerability.
How is avast vpn free for mac not for woindows. Avast. An important principle in security is reducing your attack surface, and ensure that servers have the minimum number of exposed services.
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Some thoughts in C,I,A:
Confidentiality: Open ports (actually the programs listening and responding at them) may reveal information about the system or network architecture. They can leak banners, software versions, content, the fact a system is there at all (instead of dropping the packet) and what type of system it is (for example, nmap can fingerprint systems). Rook's answer got me thinking about this.
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Integrity: Without open port controls, software can open any candidate port and immediately communicate unhindered. This is often relied upon by games, chat programs and other useful software, but is undesirable for malware.
Availability:The network stack and the programs at open ports, even if the requests are invalid, still process incoming traffic. Even if electricity isn't an issue, technological solutions still have limited resources: degraded or denial of service results from finding a way to commit a port, network stack, computer, its hardware, network, or the people so they can't do much else.
Related to integrity and availability, an overwhelming amount of events and their logs can hide malicious activity (such as exploiting something you aren't looking at, to gain access) and lead to administrative fatigue and error. Potential misuse of certain services, by forcing the system to participate in DDoSing someone else is also possible.
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Adobe cc 2017 amtlib.dll crack. Returning to Rook's answer, the smaller your attack surface the less control of your resources (and possibly other people's) you give to potential attackers.
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In IP networks a network connection is established by creating a session between ports of two devices.
Generally speaking the connecting device will use a random 'high' port and connect to a well known port number on the destination device, for example a laptop running an Internet browser will normally connect to port 80 (HTTP) or port 443 (HTTPS) of a web server.
There are a large number of well known ports for common services in the lower range of port numbers. Garageband 8 bit plugin.
When a scan has identified open ports it is the result of some sort of response from the scanned device resulting from attempts to connect (or similar) to a particular port. When a port is reported as open it is an indication that the scanned device has some sort of service which uses the port to communicate in some way. Find contact location on messages for os x.
Open ports are not always a security risk, for example a web server has to have 80 or 443 open otherwise users can not connect to use the web server.
https://shoeever568.weebly.com/ubuntu-1510-mac-download.html. However open ports associated with unecessary services can be a security risk if the software they are associated with has vulnerabilities or the component has not been configured securely.
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