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Extra resources for Cisco PIX Firewalls: Configure, Manage, & Troubleshoot
Entries are automatically timed out after some configurable timeout period. Statefulness can also be applied to UDP communication in a pseudo fashion, which normally has no concept of state. In this case, the firewall creates an entry in the connection table when the first UDP packet is transmitted. qxd 20 5/6/05 12:40 PM Page 20 Chapter 1 • Introduction to Security and Firewalls response) will be accepted only if a corresponding entry is found in the connection table. If we move up to the application layer, we can see further use for statefulness for protocols such as FTP.
The insider is potentially more dangerous than outsiders because he or she has a level of access that the outsider does not—to both facilities and systems. Many organizations lack the internal preventive controls and other countermeasures to adequately defend against this threat. Networks are wide open, servers could be sitting in unsecured areas, system patches might be out of date, and system administrators might not review security logs. The outsider’s skills, combined with the insider’s access, could result in substantial damage or loss to the organization.
In most cases, these attacks are used to gather information to set up an access or a DoS attack. The hacker might then perform a port scan on the systems to see which applications are running as well as try to determine the operating system and version on a target machine. ■ Access attacks An access attack is one in which an intruder attempts to gain unauthorized access to a system to retrieve information. Sometimes the attacker needs to gain access to a system by cracking passwords or using an exploit.