What is an Exploit ?
An Exploit is piece of data, a commands sequence or a developed software which takes advantage an available vulnerability (or more) from a software. In result, using an exploit may grant you access to computer systems, allowing privilege escalation or a DDos attack.
There are several methods of classifying exploits. The most common is by how the exploit contacts the vulnerable software. A remote exploit works over a network and exploits the security vulnerability without any prior access to the vulnerable system.
A local exploit requires prior access to the vulnerable system and usually increases the privileges of the person running the exploit past those granted by the system administrator. Exploits against client applications also exist, usually consisting of modified servers that send an exploit if accessed with a client application.
Exploits against client applications may also require some interaction with the user and thus may be used in combination with the social engineering method. Another classification is by the action against the vulnerable system; unauthorized data access, arbitrary code execution, and denial of service are examples.
Many exploits are designed to provide superuser-level access to a computer system. However, it is also possible to use several exploits, first to gain low-level access, then to escalate privileges repeatedly until one reaches the highest administrative level (often called “root”).
After an exploit is made known to the authors of the affected software, the vulnerability is often fixed through a patch and the exploit becomes unusable. That is the reason why some black hat hackers as well as military or intelligence agencies hackers do not publish their exploits but keep them private.
Exploits unknown to everyone but the people that found and developed them are referred to as zero day exploits.
Type of Exploits
Exploits are commonly categorized and named by the type of vulnerability they exploit whether they are local/remote and the result of running the exploit (e.g. EoP, DoS, spoofing).
Pivoting refers to a method used by penetration testers that uses the compromised system to attack other systems on the same network to avoid restrictions such as firewall configurations, which may prohibit direct access to all machines. For example, if an attacker compromises a web server on a corporate network, the attacker can then use the compromised web server to attack other systems on the network. These types of attacks are often called multi-layered attacks. Pivoting is also known as island hopping.
Pivoting can further be distinguished into proxy pivoting and VPN pivoting. Proxy pivoting generally describes the practice of channeling traffic through a compromised target using a proxy payload on the machine and launching attacks from the computer.
VPN pivoting enables the attacker to create an encrypted layer to tunnel into the compromised machine to route any network traffic through that target machine, for example, to run a vulnerability scan on the internal network through the compromised machine, effectively giving the attacker full network access as if they were behind the firewall.
Typically, the proxy or VPN applications enabling pivoting are executed on the target computer as the payload (software) of an exploit.
Pivoting is usually done by infiltrating a part of a network infrastructure (as an example, a vulnerable printer or thermostat) and using a scanner to find other devices connected to attack them. By attacking a vulnerable piece of networking, an attacker could infect most or all of a network and gain complete control.