Network Security Testing Features

Why networks are vulnerable?

No matter how many people manage and automation is carried out, the networks and its components are bound to be vulnerable. This is because the network configurations keep on changing however, those may not always be carried out in a secure way. Strict procedures and policies are required but it is observed that those usually fail to get into the intricacies of network configurations. For example – a firewall change being performed to close a port needs to be done carefully; else, it will fix an intended port but may inadvertently open another port or an entire network segment.

Besides this, the inherent security vulnerabilities in the firmwares of various components may be insecure by design. Incorporating such components (for ex – firewalls, switches, servers etc), can render the network insecure.

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How Network VAPT can impact the organization in a good way?

Time and again it had been observed that and internal vulnerability assessment can expose the default userid and passwords. Or in some cases it exposes a bunch of servers which were never patched in years. If a carefully prepared network vapt checklist is used, such loopholes can be brought to surface, thus increasing the overall network security posture of the organization.

In some cases it can also help expose few vulnerabilities which can potentially result into serious data thefts. On the same note, getting network pentesting performed by a technically best and known top network security company can really add value. Organizations are found to save money and time along with the reputation, if they perform the pentesting periodically via carefully designed processes.

Network Security Vulnerabilities and Impact

Following table shows that various types of vulnerabilities can result into serious damages to the organization. This table is for reference purpose only, while network security vapt should include appropriate methods and tools.


Externally open port on firewall

External data theft or denial of service attack

Data theft

Internal unpatched server

Internal data theft or malware attack

Intellectual property loss or service unavailability

Firewall misconfigured

Internal or external data theft or malicious remote control

Data theft

Default userid and passwords allowed on a database server.

Internal data leakage or malware attack

Intellectual property

Running old firmware on network components

Targeted malware attack

Reputational and monetary loss

What Valency Networks Offers?

Valency Networks is a team of certified professionals who perform technically advanced attacks while performing network pentesting (VAPT) for an organization. Below list shows a gist of the security testing.

Exploit Categories

  • IP network exploits

  • Firewall device evasion

  • Router device evasion

  • Intrusion detection system bypassing

  • Perimeter defence exploits

  • L2-L3 switch exploits

  • VPN Exploits

Vulnerabilities Detected

  • IP ports (TCP / UDP) vulnerabilities

  • Device Detection

  • Service Mapping

  • Service Penetration

  • Device misconfiguration exploitation

  • Device Penetration

Standards Followed

  • OWASP Top 10 - 2014

  • NIST - CWE Standard

  • ISO27001:2013 Compliance

Test Approaches

  • Externally over Internet

  • Internally from within LAN

Advanced Network Security Attacks

Any corporate network undergoes lots of attacks over a period of time. While performing network pentesting, it becomes important to include those attacks in the penetration testing contract with the vendor company. Below is a list of few key attacks which matter a lot to corporates from information security standpoint.


DoS attacks today are part of every Internet user's life. They are happening all the time, and all the Internet users, as a community, have some part in creating them, suffering from them or even loosing time and money because of them. DoS attacks do not have anything to do with breaking into computers, taking control over remote hosts on the Internet or stealing privileged information like credit card numbers.

Using the Internet way of speaking DoS is neither a Hack nor a Crack. It is a whole new and different subject. This section is entirely devoted to denial of service attacks and its variants. Here, we present a broad definition of this kind of network threat, and examples of the most common attacks.


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Wireless security is something that most everyone wants, but which few actually use. Barriers to use include throughput loss in older 802.11b products, WEP's ability to be cracked, and di culty in getting the darned thing working!

What are the risk of wifi security

Unauthorized connections, Stealing bandwidth, Attacks on your systems from inside firewall, Attacks on 3, rd party systems that appear to be from you! Information leakage, Eavesdroppers capturing sensitive information, Often can be done from greater range than normal.


DDoS (Distributed Denial of Service) attacks would, usually, be generated by a very large number of hosts. These hosts might be amplifiers1 or reflectors2 of some kind, or even might be zombies' (agent program, which connects back to a pre-defined master hosts) who were planted on remote hosts and have been waiting for the command to attack' a victim. It is quite common to see attacks generated by hundreds of hosts, generating hundreds of megabits per second floods. The main tool of DDoS is bulk flooding, where an attacker or attackers flood the victim with as many packets as they can in order to overwhelm the victim. The best way to demonstrate what a DDoS attack does to a web server is to think on what would happen if all the population of a city decided at the same moment to go and stand in the line of the local shop.

  • Make sure the network has a firewall up that aggressively keeps everything out except legal traffic.
  • Implement router filters. This will lessen the exposure to certain denial-of-service attacks. Additionally, it will aid in preventing users on network from effectively launching certain denial-of-service attacks.
  • Install patches to guard against TCP/IP attacks. This will substantially reduce the exposure to these attacks but may not eliminate the risk entirely.
  • Disable any unused or unneeded network services. This can limit the ability of an intruder to take advantage of those services to execute a denial-of-service attack.
  • Observe the system performance and establish baselines for ordinary activity. Use the baseline to gauge unusual levels of disk activity, CPU usage, or network traffic.
  • Keep the anti-viral software up to date. This will prevent the site becoming a home for DDoS agents like TFN.
  • Invest in redundant and fault-tolerant network configurations. Besides the rules listed above, it is important for a network administrator, or even a machine administrator, to keep current on the latest DDoS developments.


What Is a Firewall? A firewall is a system that enforces an access control policy between two networks?such as your private LAN and the unsafe, public Internet. The firewall determines which inside services can be accessed from the outside, and vice versa. The actual means by which this is accomplished varies widely, but in principle, the firewall can be thought of as a pair of mechanisms: one to block traffic, and one to permit traffic. A firewall is more than the locked front door to your network?it's your security guard as well.

Screening Levels :

A firewall can screen both incoming and outgoing traffic. Because incoming traffic poses a greater threat to the network, it's usually screened more closely than outgoing traffic. When you are looking at firewall hardware or software products, you'll probably hear about three types of screening that firewalls perform:

  • Screening that blocks any incoming data not specifically ordered by a user on the network
  • Screening by the address of the sender
  • Screening by the contents of the communication


Network scanning involves using a port scanner to identify all hosts potentially connected to an organization's network, the network services operating on those hosts, such as the file transfer protocol (FTP) and hypertext transfer protocol (HTTP), and the specific application running the identified service, such as WU-FTPD, Internet Information Server (IIS) and Apache for the HTTP service.

The result of the scan is a comprehensive list of all active hosts and services, printers, switches, and routers operating in the address space scanned by the port-scanning tool, i.e., any device that has a network address or is accessible to any other device.

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What Valency Networks Offers, Exploit Categories

All basic scanners will identify active hosts and open ports, but some scanners provide additional information on the scanned hosts. The information gathered during this open port scan will often identify the target operating system.

This process is called operating system fingerprinting. For example, if a host has TCP port 135 and 139 open, it is most likely a Windows NT or 2000 host. Other items such as the TCP packet sequence number generation and responses to ICMP packets, e.g., the TTL (Time To Live) field, also provide a clue to identifying the operating system.

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