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If a web server has a command execution vulnerability, you can hack the server using the vulnerability for (choose all that apply):
downloading a zip file containing a backdoor shell and unzipping it
getting the administrator's password
writing a backdoor shell
using XSS
using SQL injection
Very often command execution vulnerability makes possible to get access to the server: 1) getting the administrator's password by serching the correct file; 2) using the commands to write a shell into the server (there are some very short backdoor shells that meake easy to echo them into a file); 3) starting an external download page with a zip file with a shell and using the command console to unzip it.
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