A server is a machine running a software daemon that is generally accessed over a network by other machines.

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Dealing with a malware infected server

I have a web server which is heavily infected by malware. That is, around 12 websites (Outdated CMS) are infected by PHP shells and XSS. My websites are banned and are not accessible anymore. I have ...
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1answer
72 views

Man in the middle attack on loopback

We made a client/server program that runs at localhost. Is it possible to execute a man in the middle attack on the loopback between the client and server?
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1answer
100 views

What Are Good Code Signing Environment Guidelines? [closed]

Take this scenario as an example: An organization has a few build servers that periodically check out source from a repository and builds everything. When a build finishes the binaries are code signed ...
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1answer
135 views

Is it okay to have a blank root password for MySQL if port 3306 is not forwarded?

I'm running a PHP server that will use the root account to access the database. However, the server is behind a router and port 3306 is not port forwarded. Is it okay to have a blank password for the ...
4
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1answer
59 views

How do I protect the stored clients' public keys on a server?

I'm learning about security at the moment, and I want to store my clients' public keys on the server to facilitate distributing and managing those keys, my question is what are the possible ways to ...
3
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1answer
45 views

Prevent snapshots of VPS

Pretend I have a server. Is there anyway to prevent (or make more difficult) the administrator from taking snapshots? Feel free to give me a software way, or suggest if I should change server types; ...
5
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1answer
122 views

Browsers and HTTP Public Key Pinning

The strength of HTTP Public Key Pinning (HPKP) is that the browsers are saving the keys from the HTTP header and can check in the future if the certificate from the website is valid. I have two ...
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1answer
61 views

How to prevent a hacker from accessing other user's web dir

My website got hacked today :) The hacker accessed a website hosted by another user on the same server, then he got access to my /home/website-dir/ ! it's my server and I use it to host some websites ...
4
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1answer
120 views

Investigating a possible rogue DNS Server (maybe DNSChanger)

One of the users of our RouterCheck tool was complaining about random popups containing ads in Spanish and Russian. Upon investigation, we found that the DNS settings on his router were changed to ...
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1answer
121 views

Proxied server requests + forwarding authentication info in a secure fashion

We are using PassportJS with a couple of Node.js servers - Passport is just a library that is popular for Node.js server authentication - but we have some questions about how to use Passport with ...
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2answers
99 views

Secure Software: How to ensure caller is authentic?

For multiplayer (competitive) games, there is often the issue of needing to detect illegitimate players so they can be denied service. On the other hand, legitimate players should of course be ...
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3answers
3k views

Could a VPS provider have access to the content of their users?

Could a VPS provider like DigitalOcean have access to the content of their users? In their terms of service they do not mention anything related to this question, but could they theoretically have ...
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1answer
169 views

Client/server communication keystore and tls

I want to establish a client-server communication using TLS protocol. The point is I dont understand a few things since I don't know many oner security. I have created certificates for my server and a ...
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1answer
94 views

How do hackers get into servers? [closed]

I am a web developer. I've checked How does hacking work? and I know all of the things described in the most upvoted post. However, I can't understand how do hackers get into servers when the website ...
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2answers
121 views

TLS or IPsec protocol for client-server communication? [duplicate]

What is the best protocol for client-server communication? TLS or IPsec? I have a public channel where users communicate with each other using a digital certificate like X.509.
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3answers
148 views

Has my server been compromised? [duplicate]

--thanks everyone this has been resolved, see my answer below-- I created an Debian/OpenVPN server several months ago for private use but in the last two days I've noticed something extremely ...
7
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1answer
215 views

“Fix” man in the middle

I've just tried to ssh connect to a server (auth via ssh key), and get the well-known message WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!. I'm the server administrator (but I'm not really a good ...
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0answers
49 views

How to keep home hosted webserver safe [closed]

I've got a raspberry pi I used as a web server. It's not for any sort of commercial traffic I just have it as a machine on my network so I can SSH/FTP in. I recently setup a page linked to a domain ...
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2answers
183 views

Mobile Phone Client -> Server Authentication based on device

I have a mobile application (Android, iOS) and a server, which handles requests from the application. It is easy to perform standard authentication using SSL, password and random token to ...
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2answers
110 views

Is using a sqlite with random name file secure?

As you know, SQLite have no security mechanism. My question is if i change the database file into some random name like '22OYIz23tmpyesTcMVFmw1tquFxzCIQD.sqlite' can someone exploit my database and ...
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2answers
53 views

Secure protocol for a backup server? [closed]

I want to make a back up system in my home, but I don't know I should use a FTP server or a TPC-based cloud server or a SSH-based server. Which method is best in security? I just want to upload and ...
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1answer
71 views

Server is Sending Spam

I have determined that my server is compromised because it is sending spam (from one of my legitimate addresses). How can I determine what's compromised? Does the attacker know my SSH password? ...
2
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1answer
135 views

Can clients visit my site, and spam socket.emit(something); to my server, or is there some security behind socket.io?

I'm using Socket.IO and the client side looks like this. <script src="/socket.io/socket.io.js"></script> <script> var socket = io(); socket.emit("sendData", "hello!"); ...
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2answers
115 views

Physical protection of your servers?

Here is a scenario. You are a small startup company that makes a video game. In your video game, you can exchange money for items. You are not dealing with the credit card/debit card directly but ...
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1answer
149 views

Security Setting up personal web server [closed]

I'm sure something like this has been asked many many times over the Internet. I'm asking again because I need situation-specific response. I've already set up a home web server. My setup is like ...
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1answer
128 views

Preventing outgoing Portscan/SYN/UDP Floods in the datacenter

We are a VPS hosting company that have servers housed in a datacenter in Germany. Currently we are receiving multiple take-down requests because customers are ports scanning or attacking servers ...
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13answers
8k views

Is a server infrastructure fundamentally possible which the smartest person can't breach?

TL;DR: Perhaps I've gone overboard with my question's detail, but I wanted to be sure the question was clear since the topic seems very broad. But here it is. The word "smartest" is meant ...
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1answer
36 views

Is it secure to have an iPad app run a webDAV server on localhost without authentication?

I have two iPad apps running on the same device. One is hosting a webDAV server on http://localhost:8080 without any authentication (the server is active whilst the app is foregrounded, and for a few ...
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1answer
470 views

Command & Control Server List [duplicate]

I recently got an email from my ISP saying that they'd detected traffic to a known Command & Control server from my home. Boo. I'm sure this probably means one of our computers has some awful ...
2
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1answer
86 views

Communicate through gpg

I need to frequently communicate with a server in the manner do stuff related to x or send me info of x My thoughts are to directly put the task I want to be executed into the package I want to send, ...
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3answers
198 views

Authy: Does multi-device mode imply that all keys are stored on their servers?

My understanding is that if you use Authy, without backups/multi-device options, none of your account keys are stored on their servers. It all resides on your single device. Ie, even if Authy ...
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1answer
80 views

Authentication on client server

I have following requirements for system: My admins authenticate on client servers Over http Central authorization server My solution is based on O-Auth: user is redirected to authentication ...
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0answers
27 views

Is there any risk in allowing clients to be fed opengl shaders?

I'm working on a project that may eventually involve server specified fragment and vertex shaders. What are the possible risks of allowing a third party to send fragment/vertex shaders and execute ...
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2answers
221 views

How secure is loging into internet banking via an https library?

My bank does not have an API so I want my server to log in and check incoming payments to notify me if a client has paid or not. I would like the server to log in and scrape using Beautifulsoup and ...
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2answers
282 views

Don't store passwords in database? [closed]

Where might someone keep them besides a database? By storing passwords elsewhere I mean a non-traditional database. Allow me to explain. A couple of my friends run high security websites. They ...
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5answers
415 views

Does setting a default DROP policy actually improve security?

It seems that the status quo at the moment is to configure firewalls to drop any packets that aren't destined for specifically-opened ports. Many defensive port scanners (such as ShieldsUP!) seem to ...
11
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1answer
1k views

Git server security

I want to install a Git server for my company. I'm able to get a Windows virtual machine. Now I've been asked to assess its security aspects. I'm lost on how to achieve this goal. As it is a Windows ...
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3answers
57 views

Which attacks can a malicious hosting company execute? [closed]

Which attacks can a rogue hosting company carry against the servers it hosts? Assume that the rogue hosting company also provides full access to law enforcement. I was just wondering about that. So ...
2
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1answer
382 views

Remote Administrative Access to a server, KVM over IP or HP iLo?

We have a situation. We want to grant remote administrative access to one of our servers for clients. As I know, there are two possible ways: 1- KVM-over-IP and 2-HP iLO. The most important thing for ...
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2answers
119 views

Verifying Client with Server

I'm currently designing a basic Java program that uses sockets to communicate from a server to multiple clients. I want the clients to be unmodified, however, to prevent against users trying to use ...
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0answers
46 views

Is there a pre-established method for cracking RSA SecureID codes?

I am using the most modern version of RSA SecureID's tokens with a RSA server (used with a lot of governments and larger organizations ). I was just wondering if there was a pre-established method for ...
1
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1answer
78 views

How to make sure my HTTP server on Win 7 is secure? [closed]

I'm hosting a HTTP server from home. I'm concerned about security issues since the machine has some personal files in it. I have forwarded data from external IP port 80 to my IP at port 80. The ...
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5answers
333 views

DDOS Server Attacks & Domain Names

I'm currently with a web hosting account whose servers seem to be constantly down due to DDOS attacks. I check my analytics daily and I'm seeing a major surge in fake traffic for several of my URLs ...
2
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1answer
102 views

What does this attack string do? How do I mitigate it?

Today I decided to run the apache-scalp script and it found a few issues. One was ranked as Impact 5, and I'd like to know if someone could explain what this does, and how to disable it? The request ...
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0answers
86 views

Is there a solution for On-the-fly-encryption with active directory rules & policies?

I am looking at having our servers' sql databases for a few program and documents to be always encrypted on the HDD, but available to AD users. So one or multiple users with the right AD privileges ...
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3answers
141 views

Is it possible for an attacker to redirect a packet sent by a client, modify it then sent to original server

Theoretical question: Is it possible, or will it ever be possible, for an attacker to sniff/intercept it and redirect a packet, sent from a client through wireless, modify it and then sent to the ...
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1answer
36 views

Is it possible to FDE a VPS/VMS

Is it possible to implement Full Disk Encryption on a Virtual Machine Server or a Virtual Private Server? Also, if it's possible, will the service provider (of the VPS) be able to decrypt/see my ...
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1answer
95 views

Store/retrieve users passwords on server (using password managers ?) [closed]

I am working on a project in wich a school's server will need to use students' passwords periodically to connect to another website for them. I am aware that storing users' passwords in a server ...
5
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1answer
94 views

Mail client: Public key pinning

I'm running my own mail server setup: - IMAP: Dovecot - SMTP: Postfix There are 4 clients which retrieve emails via IMAP: - iOS (Default client: Apple Mail) - Android (Default client) - Mac (Default ...
3
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1answer
118 views

Is a newly installed server with no services running (but connected to the web) at risk?

A new server has just been installed but literally has nothing else running on it, no services setup to SSH in or anything yet (it's a Linux server). However, it is hooked up to the web so I can ...