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8: Auditing Web Servers and Applications
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NOTE Keep in mind that the audience of this book varies greatly in technical abilities, and an attempt has been made to simplify the content in this section as much as possible for the majority of the readersYou will find further guidance by visiting wwwowasporg to determine what scope and toolset are most appropriate for your environment
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1 Ensure that the web application is protected against injection attacks
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Injection attacks allow a web client to pass data through the web server and out to another system For example, in a SQL injection attack, SQL code is passed through the web interface, and the database is asked to perform functions out of bounds of your authorization Several websites have coughed up credit card and Social Security card information to hackers who have taken advantage of injection attacks Failure to realize the power of injection attacks and to review your systems for the likelihood of being exploited may result in the loss of critical and sensitive information
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PART II
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Discuss injection attacks with the administrator and web application development team as appropriate to ensure that they understand how such attacks work, and then ask how they are guarding against injection attacks No tool can review and discover every possible injection attack on your web application, but you still can defend your system against such attacks The following defense methods could also be listed under the next audit step, reviewing cross-site scripting: Validate all input using positive validation methods whereby you reject any input that does not match the expected input, such as values, length, and character sets Perform a code review if possible for all calls to external resources to determine whether the method could be compromised Commercial tools are available that may help find injection vulnerabilities, such as acunetix (wwwacunetixcom) These tools are powerful and may find well-known attacks, but they will not be as helpful as performing a solid code review Another tool that may be helpful is Burp Suite from wwwportswigger net Burp Suite is a powerful tool and should be part of your toolset Consider hiring third-party help if the application is particularly sensitive, you lack the resources, or you need to verify items such as regulatory compliance NOTE These steps apply to the application development life cycle as much as they apply to an existing application Payment Card Industry (PCI) requires compliance with OWASP for your existing web applications, but that starts on the drawing board before the first line of code is written
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2 Review the website for cross-site-scripting vulnerabilities
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Cross-site scripting (XSS) allows the web application to transport an attack from one user to another end user s browser A successful attack can disclose the second end user s session token, attack the local machine, or spoof content to fool the user Damaging attacks include disclosing end user files, installing Trojan horse programs, redirecting the user to some other page or site, and modifying the presentation of content
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XSS attacks are difficult to find, and although tools can help, they are notoriously inept at locating all the possible combinations of XSS on a web application By far the best method for determining whether your website is vulnerable is by doing a thorough code review with the administrator If you were to review the code, you would search for every possible path by which HTTP input could make its way into the output going to a user s browser The key method used to protect a web application from XSS attacks is to validate every header, cookie, query string, form field, and hidden field Again, make sure to employ a positive validation method CIRTnet contains two tools, Nikto and a Nessus plug-in, that you might be able to use to help you partially automate the task of looking for XSS vulnerabilities on your web server Keep in mind that these tools are not as thorough as conducting a complete code review, but they can at least provide more information to those who don t have the skill set, resources, time, and dollars to conduct a complete review Nikto is available from wwwcirtnet/code/niktoshtml Burp Suite and many other commercial tools that may help also are available NOTE Always keep in mind that these tools may find well-known attacks, but they will not be nearly as good as performing a solid code review
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If you don t have the internal resources available to perform a code review, particularly on a homegrown application, and you believe that the data on the website warrants a deep review, then you may consider hiring third-party help
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