Questions tagged [webserver]

A system whose primary function is to deliver web pages on request to clients.

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43 views

Purpose of OPTIONS method [closed]

I've been seeing OPTIONS method on my web server logs, when I googled about that stuff it says the its responsible for handling request from Same Source Origin policy. So I tried to access our site ...
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70 views

There seems to have been an attempt to attack my website [duplicate]

I am using PHP as a server side language. And I don't use CMS or Framework. From the nginx log the website attack seems obvious. I wonder what kind of attack the attacker attempted. The attacker ...
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Can you use a domain to forward web traffic at DNS to another domain but still use the MX record for this domain

What I am attempting to do is ensure all ingress web traffic [http(s)] to exampledomain1.com forwards to exampledomain2.com but I still want to use the MX record of exampledomain1.com to point to at ...
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2answers
72 views

is iptable whitelisting secure enough in AWS

Suppose my app is hosted on multiple servers, within the same data center (say in AWS or DigitalOcean). To secure communication between these servers, I use iptable to whitelist each other's IP. ...
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98 views

Unknown website tries to connect to my website [duplicate]

A few minutes ago an error popped up on my error tracing app. I'm hosting a Django app which has login system. The error says: Invalid HTTP_HOST header: 'www.moxing.one'. You may need to add 'www....
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1answer
86 views

What are the risks of using non-ssl connection between server and (externally hosted) database?

I am building an application using AWS Lambda and using a MongoDB database hosted directly with MongoDB (Atlas). For some reason, I get an error when trying to connect via SSL and I've been working on ...
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2answers
86 views

VPN service - change of ip

Imagine I connect to example.com, change my IP address using my VPN service, and then remain on example.com in my browser. Meanwhile I open some other sites and eventually switch off my VPN service. ...
2
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1answer
57 views

PDF Server Side 2020

I have been gathering information on handling PDF files for web applications. Much of my research has been on displaying the files to the user. What I want to learn here is how to properly handle the ...
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1answer
64 views

Which has to handle certificate, a website, a web server or a web application?

In web, what is a certificate issued to, a website, a web server or a web application? Which has to handle certificate, a website, a web server or a web application? For example, when I run a web ...
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2answers
169 views

Does Cloudflare masking my IP make my server more secure?

I've heard in a conversation and read in some forum posts that Cloudflare will proxy your IP, hiding it from the public, and this mitigates the risk of an attacker finding your server in the first ...
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1answer
201 views

Can a user hack a server running apache from a website

Is it possible that a user can hack a server running Apache httpd from the website it hosts? Let's say I have a PHP web application running under Apache with explicit user www-data in the virtual host ...
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2answers
86 views

Is it safe to publish a REST API client on npm even though the API is not intended for public use?

I am build a website in Angular which communicates over my REST API on my backend server. I have managed to auto-generate the code (TypeScript) for my client and now I need it to be available on ...
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1answer
263 views

Strange HTTP request from binaryedge.ninja

I found the following strange HTTP request apparently emanating from binaryedge.ninja: min-li-ustx-12-13-65991-x-prod.binaryedge.ninja - - [05/Jan/2020:07:18:48 -0500] "GET / HTTP/1.0" 302 212 "-" "-...
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3answers
4k views

What use would a privacy browser, such as Firefox Focus for iPhone, have for an internal web server?

The Mozilla Foundation has a "privacy browser" called Firefox Focus that is available for example iPhone (here). This browser has an always-on ad blocking function. I was checking the third-party ...
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1answer
66 views

Is it a security issue that underlying infrastructure (like e.g. Kubernetes cluster) can easily be revealed?

I have recently found out that a very common setup of Kubernetes for some use cases of access over TLS returns an invalid certificate with name Kubernetes Ingress Controller Fake Certificate. I.e. ...
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169 views

Is it a security issue that Nginx returns server name in errors?

I have recently sat up an Nginx in a way that makes it not return a Server header and hide the version information from the error pages. The error page looks like that now (and anyone can provoke it ...
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2answers
97 views

Locking server ‘root’ to IP whitelist, But prevent my lockout

To protect my Debian servers, I'd liked to lock access of username ‘root’ to only IP addresses(or ranges) listed in a ‘whitelist’ file. But getting locked out of my server is even worse than getting ...
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55 views

Western Digital My Cloud - Website GUI & Security

I am trying to figure out if using the Website "files.mycloud.com" is exposing my files to being intercepted at a central point. I see that there is an HTTPS connection with valid cert for *.mycloud....
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2answers
103 views

Can someone perform DDoS on my VPS even if it is only accessible through SSH?

Can someone perform DDoS on my VPS even if I have not installed any webserver software like apache, nginx, etc.? Since I have not installed any webserver software, it's not really available to the ...
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2answers
84 views

Is it possible to attack the main server through a reverse proxy server that only serves as a url rewrite?

I have a content site https://www.mysite.com I'm asking a client to configure a reverse proxy server connection in their server so everything inside the subdirectory 'external-content' gets pulled ...
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1answer
163 views

Leaking details about the user in web application

Imagine a web application, which is used for getting og Open Graph tags from url. User can submit a form, which has single url input. Server opens the url in a headless browser, get og:title, og:...
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1answer
48 views

How to protect my webserver from unauthorized client applications? [duplicate]

I would like to host simple HTTP webservices and develop a web client for it (basic javascript app in the browser). any person (even without registering) shold be able to access the webservices but ...
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54 views

Returning Social Security Number After Validation Checks on Web Based Form

I have a web based application form that is used to gather personal information for web based users. One of the fields is an SSN. My question is simple, in terms of security compliance (in general, ...
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2answers
89 views

Are there potential risks to sending HEAD requests to user-supplied URLs?

I have an application that unshortens URLs by using the python requests library to send HEAD requests with allow_redirects=True. I don't do anything with the response except check the response URL. ...
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1answer
100 views

UUID as auth token [duplicate]

I am working on a small IOT device that basically is a status display, which includes data about my phone. That means that I have a simple web server running, which can be used to update the devices ...
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5answers
7k views

Why do some web servers still provide information on vendor and version in the HTTP response headers

I think in the security field it is a well-known fact that its not a good idea to let the web server vendor (e.g. Apache) and the version be visible to the outside as this can be used to launch ...
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1answer
145 views

For zero-deployment via GitLab Piplines - What kind of unix User?

I want to implement a zero-deployment strategy for my websever. My first attempt was to create a specific user (deployer) for that: # Create user deployer sudo adduser deployer # Give the read-write-...
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1answer
78 views

is sending SQL query operators in HTTP GET requests is some kind of security issue? [duplicate]

Our webserver is forwarding HTTP GET request to application server as below including a statement or condition like "AND 1=1", our Palo Alto Firewall detecting this traffic as SQL Injection alert. ...
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2answers
201 views

Does it really improve security to update PHP interpreter version without any code changes at all?

Our hosting provider wants to update our legacy application server (Plesk). We usually place older PHP projects (PHP 5.3 - 5.6) there, so they can sit in a stable environment until their unknown EOL. ...
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1answer
192 views

Does Nextcloud installation gives passwordless access to all files by default?

I used this guide to install Nextcloud instance on a Raspberry Pi. The installation went smoothly and in the end I could open the Nextcloud login page which, once presented with the right password, ...
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1answer
154 views

Where precisely are client X509 certificates stored?

Apologies for what might seem like a naive question, but there is a detail to PKI architecture between clients and servers, the answer to which I have so far not been able to come across no matter ...
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3answers
267 views

Is a web application firewall enough to defend against sql injection? or should I use prepared statements?

Is it enough to rely on a web application firewall for protection against SQL injection? or should I use other techniques? During a conversation with a friend he said it is enough to use web ...
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38 views

Hacking attempts to our server - what does this code do? [duplicate]

Every so often I go back and check our server and find random files uploaded to the domain root directory. They are seemingly cryptic and have names like css2.php db_model.php ....
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1answer
59 views

Reverse proxy isolation from insecure blog, are sessions vulnerable?

Hi I have a WebApp where security is important. E.g. www.somewebapp.com The app has a wordpress blog (hence not secure since wordpress). e.g. www.somewebapp.com/blog To protect the webapp from ...
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0answers
28 views

Securing multiple systems accessing the same data

I'm hitting a roadblock when it comes to security for managing scoped permissions for servers. Right now I run a community which can create sub-servers. So community A can allow certain users to ...
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1answer
173 views

Passing user ID as parameter without any authentication, what are the security risks?

I've read that passing GUID as URL parameter isn't considered insecure because usually, an app has an authentication mechanism (checking against some session token). However, how secure would an ...
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2answers
294 views

Why does localbattle.net point to localhost?

I found a random link on a forum linking to localbattle.net, at the same time I was running a local server on localhost. When I went to localbattle.net, my local server page appeared! The certificate ...
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4answers
198 views

Generate Fake Encrypted Data

I want to create a file server that will be serving encrypted files without permissions. It would be really awesome if it were impossible for a hacker to tell if a file exists or not, so I am thinking ...
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1answer
166 views

When should you give up on attempting a xss on part of a website? [closed]

I'm wondering when do you give up on some type of user input to exploit? What are the things that go through your head and that you check off, that makes you think that the input is properly sanitized?...
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1answer
119 views

File upload security with PHP - Header to text/plain

I am using PHP to create a small script that uploads images to a server. While going through the PHP documentation, I found a contribution from user CertaiN that gives a very clear example of how ...
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42 views

“GET //libs/js/iframe.js HTTP/1.1” 200 2305 “-” "python-requests/2.6.0 is it a try to hack into my server [duplicate]

Just Received a request in my nginx log 77.247.110.141 - - [16/Jun/2019:14:03:58 +0000] "GET //libs/js/iframe.js HTTP/1.1" 200 2305 "-" "python-requests/2.6.0 CPython/2.7.5 Linux/3.10.0-957.12.2.el7....
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2answers
126 views

Identifying a script used for vulnerability scan

The logs of a server are showing a great number of 404 responses in a short time. Apparently somebody used a tool/script to look for known vulnerabilities by combining the server and part of the path ...
2
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2answers
283 views

Using fail2ban for detecting suspicious activity whitin a webserver

I know that fail2ban is mostly used for blocking IPs trying to brute force an SSH endpoint and other stuff like that. However, I am wondering if you could also use fail2ban to detect (not necessarily ...
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1answer
61 views

Unusual Get/Connect requests to Apache [duplicate]

Not sure if that has been asked before but over the last week I am getting hundreds of CONNECT and GET requests to my Apache web server for domains that are not on my server. Some are for well known ...
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1answer
124 views

Tracking script creates vulnerability

I am using a third party service that provided a tracking script which when embedded in the page seems to create some kind of vulnerability as occasionally people are redirected to a phising link ...
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2answers
108 views

How does a hacker get access to my files if he got access to another user's files on a shared server? [closed]

I host files on a shared server with Ubuntu 14.04. How does a hacker get access to my files if he got access to another user's files and how do I prevent it?
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2answers
174 views

Burp Suite's keeps my ip safe?

I am starting to learn how to use Burp Suite, but since it is kind of (tho I know it does more) automatic way of plugging information into a website/form, should I still use proxychain/vpn to keep my ...
2
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0answers
279 views

Can XXE be exploited when disallow-doctype-decl is set to true (Apache)?

I found out that an endpoint of a website may be vulnerable to XXE. It is using Unmarshal as an XML parser. When I try to send a post request using common XXE payloads, I receive the following ...
50
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5answers
12k views

What exploit are these user agents trying to use?

I just looked at my user agent tracking page on my site (archived on Yandex) and I noticed these user agents. I believe they are an attempt to exploit my server (Nginx with PHP). The 1 in front of it ...
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1answer
1k views

How to hide webresource.axd and scriptresource.axd file?

I am getting an email from the security team, saying that webresource.axd and scriptresource.axd are visible. How do I hide it ?

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