Firewall: System ranging from home systems to global IT

Firewall: A
firewall is a network security system that monitor and controls incoming and
outgoing traffic based on security rules. Firewall typically establishes barriers
between trusted internal network and untrusted external network such as
Internet.

Firewalls are important components of security. System
ranging from home systems to global IT infrastructure all need firewall as part
of a security solutions. Firewalls are not protected solutions. When it comes
to firewall, you need to account for several well-known limitations in design
and managements.

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Limitation of
Firewalls:

Fragmentation: Fragmentation
attacks are an abuse of the fragmentation offset of IP packets. Where many
different network links joins to construct a global infrastructure
fragmentation may occur. When the fragmented elements of the original datagram
reassemble, it may cause several potentially malicious reconstructions known as
overlapping and an overrun.

Firewalking: It
is a technique to learn the configuration of a firewall from outside. The
technique uses a valid IP address of an internal host. Then, from an external system,
hackers try to communicate with the internal host over multitude of different
ports. In the form of scanning with the help of the known internal host, the
hackers can learn not only which port is open but also actually which ports
allow communication with an internal system. Firewalking discovers the rules or
filters on a basic packet filtering firewall.

Internal Code
Planting: It is an known firewall limitation. Firewalls are often deployed
as border sentries. They protect internal systems from communication that
originates from external entities. Unfortunately, some security administrators
use inbound firewall filtering only, leaving outbound traffic controlled and
unfiltered.

Denial of Services (DoS):
 It is another problem that reveals a
limitation of a firewall. DoS attack, specifically a flooding or traffic based
DoS, sends massive amounts of data to a target victim. The firewall’s filtering
service can usually prevent the DoS traffic from breaching the networks and
affecting internal systems.

Weakness of a
Firewall:

A primary for network traffic filtering. It’s
not an authentic system. Firewalls are not designed to check logon credentials,
validity of digital certificates or compare biometric scans. A firewall is not a remote access server.
Connections from remote users do not have endpoint at the firewall. Instead the
endpoint Network access server (NAS) or Remote access server (RAS). Encryption is one method of evade filtering.
Users and hackers can employ client-side encryption solution that encodes data
before transmission or create unauthorized encrypted encapsulated to prevent
firewall filtering.Firewall is also not a malicious code scanner. Firewalls
are traditionally rule based filtering products.Many firewall rules block traffic with spoofed
addresses, uncommon ports, unauthorized protocols, invalid header constructions
or values, etc. Such rules block a significant amount of traffic caused by
malicious code, but these rules do not themselves directly block malware from
entering or leaving a network. Keep in mind that your firewall can do many
things, but it’s not a malicious code scanner.

Methods to overcome
Limitations:

Phishing is one of the most widely firewall
attack happens. This attack includes sending e-mails messages through firewall,
convincing users to provide their password or unwanted downloads malware.
Security experts should utilize one way door to forestall remotely produced
message into firewall secured modern systems.Another firewall attack is to attack unsecured
customer. Mechanical programming is a defenseless as an operation’s modern
server. Uninstall or disable any unnecessary services
and software on the firewall that are not required.In order to run the firewalls safely and
securely limit the number of application. Behind the firewall consider running
the antivirus, content filtering, DHCP, VPN and authentication software on the
dedicated systems.Instead of administrator or run, if possible run
the firewall service as a unique ID.Treat the logs as business records and include
them in your data retention policy. Regularly monitor the firewall logs.