On 11/16/2011 10:16 AM, securityfocus (at) rawchaos (dot) com [email concealed] wrote:
> If you can modify the source for the website, you can add something like this with PHP at the end of the page:
>
> <?php
> passthru("/path/to/nmap<args> " . $_SERVER['REMOTE_ADDR'] . ">> /path/to/log_file.log 2>&1&");
> ?>
>
> It is important to note that "2>&1&" allows this command to be backgrounded so PHP will not wait for this command to finish before rendering the page and closing. Also if you are behind a proxy you might have to use something like $_SERVER["HTTP_X_FORWARDED_FOR"] instead.
>
> If modifying the source of the page is out of the question, I would avoid scanning the logs as there's no guarantee of when apache will flush logs to disk (it does not happen in real time). It would probably work just fine, but if you are going to write a log scraping service anyway, I'd sooner write an apache2 module or use mod_perl to hook EXEC_ON_READ or similar.
>
> -a
>
>
Using HTTP_X_FORWARDED_FOR in a system command is a terrible idea, as it
is under the control of the client. You would be introducing a command
injection vulnerability.

Dan

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