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    Application Hardening Checklist

    By
    eWEEK EDITORS
    -
    March 25, 2002
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      Applications are the most difficult parts of an IT infrastructure to secure because of their complexity and because they often need to accept input from a variety of users. Here are guidelines to lowering the risk of a system intrusion because of an application flaw:

      • Assume all installed applications are flawed—dont rely on the security programmed into them.
      • Physically remove from the system all applications not being used.
      • Use firewalls, content filters and OS user authentication features to restrict access to the application, and provide access only to those who absolutely must have it.
      • Update all applications to the latest patches when security bulletins are released.
      • Internally developed applications need to be code-reviewed for security weaknesses. Consider an external security review for critical applications.
      • Externally facing Web applications are high-risk applications because they are a bridge between the outside world and internal customer databases. Be sure to add code that can block or otherwise safely deal with all of the following hostile inputs: missing page parameters, parameters that are unusually long, parameters will nulls or hexadecimal encoding, parameters with Web browser script blocks (which are used to create server-side scripting attacks), and parameters with quotes and semicolons (likely attempts to send hostile SQL commands through to the database).
      • If possible, write applications in languages that run in virtual machines–such as Java, Visual Basic .Net or C#–because they provide an extra layer of security protection. Avoid C and C++ because they make it easy to write applications that allow buffer overflow attacks.

      Also in this Special Report

      • Ignorance: The Hackers Best Friend
      • Security Roundtable
      • Here Be Dragons: Web Services Risks
      • Threats to Come
      • Trail of Destruction: The History of the Virus
      • Community Builds Security: Labs Answers Your Security Questions
      • WLAN Hardening Checklist
      • Operating System Hardening Tips
      eWEEK EDITORS
      eWeek editors publish top thought leaders and leading experts in emerging technology across a wide variety of Enterprise B2B sectors. Our focus is providing actionable information for today’s technology decision makers.
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