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An attacker needs to destroy evidence of his presence and activities for several reasons like being able to maintain access and evade detection (and the resulting punishment). Erasing evidence of a compromise is a requirement for any attacker who wants to remain obscure and evade trace back. This usually starts with erasing the contaminated logins and any possible error messages that may have been generated from the attack process.
Once an attacker gains access to the target system, the attacker can choose to use both the system and its resources and further use the system as a launch pad to scan and exploit other systems, or he can keep a low profile and continue exploiting the system. Both these actions can damage the organization. For instance, the attacker can implement a sniffer to capture all network traffic, including telnet and ftp sessions with other systems.
Gaining access is the most important phase of an attack in terms of potential damage, although attackers don’t always have to gain access to the system to cause damage. For instance, denial-of-service attacks can either exhaust resources or stop services from running on the target system. Stopping a service can be carried out by killing processes, using a logic/time bomb, or even reconfiguring and crashing the system. Resources can be exhausted locally by filling up outgoing communication links.
Attackers use a method called scanning before they attack a network. Scanning can be considered a logical extension (and overlap) of active reconnaissance since the attacker uses details gathered during reconnaissance to identify specific vulnerabilities. Often attackers use automated tools such as network/host scanners and war dialers to locate systems and attempt to discover vulnerabilities.
Planning for a cyber disaster makes recovering from one much easier. Still, as important as disaster planning is, it's often overlooked or put off until it is too late. In this webinar, Global Knowledge instructor Debbie Dahlin discusses planning for the unexpected -- whether the unexpected means a simple power outage, a network security breach, or a major natural disaster. She'll discuss risk analysis and risk management techniques and explain the importance and process of creating a business continuity plan. Using a fictional company as an example, Debbie will walk you through the disaster planning process a security professional should use, and she will provide simple tricks to reduce your company's downtime before, during, and after a disaster.
In this webinar, the second of two based on our Cybersecurity Foundations course, you'll build on what you learned in the first of the series, Protecting Your Network with Authentication and Cryptography.
In this webinar, the first of two based on our Cybersecurity Foundations course, you will examine the following topics: verifying users and what they can access, ways a user can be validated to computer and network resources, how cryptography is used to protect data, symmetric and asymmetric encryption and hashes.
As any network administrator will tell you, the ASA Security appliance (as well as its forerunner, the PIX) are capable of generating massive amounts of log messages, especially when the firewall/security appliance is set to log messages at debug level to the syslog...
A feature common to IPSec Virtual Private Network implementations throughout the Cisco product line is Perfect Forward Secrecy (PFS). This optional additional component is now a default supplied configuration setting with the Adaptive Security Device Manager (ASDM) I...
Occasionally as I'm teaching a Cisco training class, I get an idea for a blog post and it happened again this week. The Securing Networks with ASA Fundamentals curriculum is mostly based on the Adaptive Security Device Manager (ASDM). While the class describes the us...