Policy Types - ZyXEL Communications ZyWall 110 User Manual

Policy Types

This table describes Policy Types as categorized in the ZyWALL/USG.
Table 203 Policy Types
POLICY TYPE DESCRIPTION
Access Control Access control refers to procedures and controls that limit or detect access. Access
control attacks try to bypass validation checks in order to access network resources
such as servers, directories, and files.
Any Any attack includes all other kinds of attacks that are not specified in the policy such
as password, spoof, hijack, phishing, and close-in.
Backdoor/Trojan A backdoor (also called a trapdoor) is hidden software or a hardware mechanism that
Horse can be triggered to gain access to a program, online service or an entire computer
system. A Trojan horse is a harmful program that is hidden inside apparently
harmless programs or data.
Although a virus, a worm and a Trojan are different types of attacks, they can be
blended into one attack. For example, W32/Blaster and W32/Sasser are blended
attacks that feature a combination of a worm and a Trojan.
BotNet A Botnet is a number of Internet computers that have been set up to forward
transmissions including spam or viruses to other computers on the Internet though
their owners are unaware of it. It is also a collection of Internet-connected programs
communicating with other similar programs in order to perform tasks and participate
in distributed Denial-Of-Service attacks.
Buffer Overflow A buffer overflow occurs when a program or process tries to store more data in a
buffer (temporary data storage area) than it was intended to hold. The excess
information can overflow into adjacent buffers, corrupting or overwriting the valid
data held in them.
Intruders could run codes in the overflow buffer region to obtain control of the
system, install a backdoor or use the victim to launch attacks on other devices.
DoS/DDoS The goal of Denial of Service (DoS) attacks is not to steal information, but to disable
a device or network on the Internet.
A Distributed Denial of Service (DDoS) attack is one in which multiple compromised
systems attack a single target, thereby causing denial of service for users of the
targeted system.
Instant Messenger IM (Instant Messenger) refers to chat applications. Chat is real-time, text-based
communication between two or more users via networks-connected computers. After
you enter a chat (or chat room), any room member can type a message that will
appear on the monitors of all the other participants.
Mail A Mail or E-mail bombing attack involves sending several thoursand identical
messages to an electronic mailbox in order to overflow it, making it unusable.
Misc Miscellaneous attacks takes advantage of vulnerable computer networks and web
servers by forcing cache servers or web browsers into disclosing user-specific
information that might be sensitive and confidential. The most common type of Misc.
attacks are HTTP Response Smuggling, HTTP Response Splitting and JSON Hijacking.
P2P Peer-to-peer (P2P) is where computing devices link directly to each other and can
directly initiate communication with each other; they do not need an intermediary. A
device can be both the client and the server. In the ZyWALL/USG, P2P refers to peer-
to-peer applications such as e-Mule, e-Donkey, BitTorrent, iMesh, etc.
Chapter 30 IDP
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