Wireless intrusion prevention system

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In computing, a wireless intrusion prevention system (WIPS) is a network device that monitors the radio spectrum for the presence of unauthorized access points (intrusion detection), and can automatically take countermeasures (intrusion prevention).

Contents 1 Purpose 2 Intrusion detection 3 Intrusion prevention 4 Implementation 5 Notable implementations 6 See also 7 References

[edit] Purpose

The primary purpose of a WIPS is to prevent unauthorized network access to local area networks and other information assets by wireless devices. These systems are typically implemented as an overlay to an existing Wireless LAN infrastructure, although they may be deployed standalone to enforce no-wireless policies within an organization. Some advanced wireless infrastructure has integrated WIPS capabilities.

Large organizations with many employees are particularly vulnerable to security breaches caused by rogue access points. If an employee (trusted entity) in a location brings in an easily available wireless router, the entire network can be exposed to anyone within range of the signals.

[edit] Intrusion detection

A wireless intrusion detection system (WIDS) monitors the radio spectrum for the presence of unauthorized, rogue access points and the use of wireless attack tools. The system monitors the radio spectrum used by wireless LANs, and immediately alerts a systems administrator whenever a rogue access point is detected. Conventionally it is achieved by comparing the MAC address of the participating wireless devices.

Rogue devices can spoof MAC address of an authorized network device as their own. New research uses fingerprinting approach to weed out devices with spoofed MAC addresses. The idea is to compare the unique signatures exhibited by the signals emitted by each wireless device against the known signatures of pre-authorized, known wireless devices.^[1]

[edit] Intrusion prevention

In addition to intrusion detection, a WIPS also includes features that prevent against the threat automatically. For automatic prevention, it is required that the WIPS is able to accurately detect and automatically classify a threat.

The following types of threats can be prevented by a good WIPS:

• Rogue AP – WIPS should understand the difference between Rogue AP and External (neighbor’s) AP
• Mis-configured AP
• Client Mis-association
• Unauthorized association
• Man in the Middle Attack
• Ad-hoc Networks
• Mac-Spoofing
• Honeypot / Evil Twin Attack
• Denial of Service (DoS) Attack

[edit] Implementation

Most WIPS configurations consist of three components:

• Sensors — These devices contain antennas and radios that scan the wireless spectrum for packets and are installed throughout areas to be protected
• Server — The WIPS server centrally analyzes packets captured by sensors
• Console — The console provides the primary user interface into the system for administration and reporting

A simple intrusion detection system can be a single computer, connected to a wireless signal processing device, and antennas placed throughout the facility. For huge organizations, a Multi Network Controller provides central control of multiple WIPS servers, while for SOHO or SMB customers, all the functionality of WIPS is available in single box.

In a WIPS implementation, users first define the operating wireless policies in the WIPS. The WIPS sensors then analyze the traffic in the air and send this information to WIPS server. The WIPS server correlates the information validates it against the defined policies and classifies if it is a threat. The administrator of the WIPS is then notified of the threat, or, if a policy has been set accordingly, the WIPS takes automatic protection measures.

[edit] Notable implementations

AirDefense [1] is a leading vendor of WIPS solution, available with Motorola wireless infrastructure

[edit] See also

• Wardriving
• Wireless LAN Security

[edit] References