Allow internal redirect to URI x, but deny external request for x?

[lists]

Nginx does detect these traversal attacks. They come up as a 400 error. I got two yesterday. But out of paranoia, I wouldn't leave the web root. There is always some zero day.

That traversal attack was from some new to me Hong Kong hosting company and earned a place on my firewall block. Blocking just keeps the log file size down. There will be others.

https://null-byte.wonderhowto.com/how-to/perform-directory-traversal-extract-sensitive-information-0185558/

I have run dotdotpwn. Lots of false positives. It takes forever.

On nearly a daily basis, some entity gets hacked because of a misconfiguration. So I make sure I have secured the low hanging fruit. I watch file ownership and permissions. That is free. I don't have a WAF but I use Nginx maps and pattern match common hacks, given them the 444. Simple stuff like if you request some WordPress feature you get flagged because I don't run WordPress. I found a list of bad user agents on GitHub that I flag on.





  Original Message  



From: hobson42 at gmail.com
Sent: August 31, 2019 7:41 AM
To: nginx at nginx.org
Reply-to: nginx at nginx.org
Subject: Re: Allow internal redirect to URI x, but deny external request for x?


Hi Mark,

On 30/08/19 22:23, lists wrote:
> I've been following this thread not really out of need but rather that it is really interesting. That said, I don't think for security you want to "escape" the web root. The risk is that might aid a traversal attack.
>
>
I am curious to know how this might work. Nginx itself is safe, so it
would have to be a script. And while those may indeed be vulnerable, is
the vulnerability changed by symlinking the root elsewhere? I don't see
any difference myself, but perhaps you know something I don't.

Regards

Ian
>
>
>
>
>
>   Original Message
>
>
>
> From: hobson42 at gmail.com
> Sent: August 30, 2019 12:01 PM
> To: nginx at nginx.org
> Reply-to: nginx at nginx.org
> Subject: Re: Allow internal redirect to URI x, but deny external request for x?
>
>
> Hi Lewis,
>
> On 30/08/19 18:33, J. Lewis Muir wrote:
>> Hello!
>>
>> I'm using nginx 1.12.2 on RHEL 7, and I've got a FastCGI web app that
>> uses a deployment structure which uses an atomic symlink change for an
>> atomic app deploy, and I'm wishing to be able to do an internal redirect
>> in nginx to URL x, but deny an external request to the same URL x so
>> that I don't serve the same content at more than one URL.  Is there a
>> way to do that?
>>
> You could place the different versions away from the root so they cannot
> be obtained from the web. Then they can be served by setting up a
> symlink to the desired version.
>
> This can be changed using "ln -sfn version/dir serving/root" and then
> restarting nginx to pick up the new version.
>
> By not using redirects, this method should be more efficient.
>
> Regards
>
> Ian
>
> --
> Ian Hobson
>
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--
Ian Hobson
Tel (+351) 910 418 473
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