barcode generator in vb.net 2005 8: Auditing Web Servers and Applications in Software

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8: Auditing Web Servers and Applications
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The root account on UNIX-flavored hosts (Linux, Solaris, and so on) should be strictly controlled and never used for direct remote administration Never run Unix web servers such as Apache under the root account They should be run under a distinct user and group such as www-apache:www-apache Please see 7 for more information about the root account In general, accounts never should be shared among administrators, and administrators should never share their accounts with users Strong account and password policies always should be enforced by the server and by the web server application Additional considerations for IIS web servers include ensuring that the IUSR_ MACHINE account is disabled if it is not used by the application You also should create a custom least-privileged anonymous account if your applications require anonymous access Configure a separate anonymous user account for each application if you host multiple web applications
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PART II
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6 Ensure that appropriate controls exist for files, directories, and virtual directories
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Inappropriate controls for files and directories used by the web server and the system in general allow attackers access to more information and tools than should be available For example, remote administration utilities increase the likelihood of a web server compromise
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Verify that files and directories have appropriate permissions, especially those containing the following: Website content Website scripts System files (such as %windir%\system32 or web server directories) Tools, utilities, and software development kits Sample applications and virtual directories should be removed Discuss and verify with the administrator that logs and website content are stored on a nonsystem volume where possible Also verify that anonymous and everyone groups (world permissions) are restricted except where absolutely necessary Additionally, no files or directories should be shared out on the system unless necessary
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7 Ensure that the web server has appropriate logging enabled and secured
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Logging auditable events helps administrators to troubleshoot issues Logging also allows incident response teams to gather forensic data
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Verify with the administrator that key audit trails are kept, such as failed logon attempts Ideally, these logs should be relocated and secured on a different volume than web server Log files also should be archived regularly They should be analyzed regularly, preferably by an automated tool in large IT environments
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IT Auditing: Using Controls to Protect Information Assets, Second Edition
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8 Ensure that script extensions are mapped appropriately
Scripts might allow an attacker to execute the code of his or her choice, potentially compromising the web server
Verify with the web administrator that script extensions not used by the web server are mapped to a 404 web page handler or simply denied altogether Examples of extensions that you may or may not use include idq, htw, ida, shtml, shtm, stm, idc, htr, and printer
9 Verify the validity and use of any server certificates in use
Server-side certificates enable clients to trust your web server s identity or that your web server is who you say your server is supposed to be Old or revoked certificates suggest that your website may or may not be valid to end users
Verify with the help of the administrator that any certificates are used for their intended purpose and have not been revoked Certificate data ranges, public key, and metadata all should be valid If any of these have changed, consider the need for a new certificate that reflects your current needs
Part 3: Test Steps for Auditing Web Applications
This section represents an approach to the application audit as represented by the Open Web Application Security Project (OWASP) Top 10 According to its website, OWASP is dedicated to enabling organizations to develop, purchase, and maintain applications that can be trusted OWASP maintains a tremendous amount of information that can help you to develop an audit program for your web applications The OWASP Top Ten are regarded as a set of minimum standards to be reviewed during an audit Do not blindly follow the steps in this section Your web application design may call for additional testing including a partial or full code review, third-party penetration testing, commercial scanners, or open source tools Each of these can offer some additional assurance that your application is correctly designed and configured Consider the business value of the web application and invest in the appropriate resources to ensure that your application is secure Additional guidance on how to effectively find vulnerabilities in web applications are provided in the OWASP Testing Guide and the OWASP Code Review Guide found at wwwowasporg Application design drives the importance of the following steps We assume that interactions occur between the web server and the user These interactions may come from logging into the application or serving user-requested data
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