Questions tagged [server]

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

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Verifying the authenticity of data coming to a server

I'm a newbie when it comes to information security. So pardon me if the solution can be found at page 12 of any introductory text. I have an express server and two android apps(for clients and admin)....
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1answer
52 views

The main things a cloud data center could inject into its hardware

So some cloud service providers like Amazon use custom hardware to improve different characteristics of their servers. This also means they can control the security better, because there is nothing ...
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2answers
483 views

How to Verify Integrity of Transferred Files in a Client Server Protocol

How do I implement integrity verification using the checksum of files in a client-server protocol where the client sends multiple files to the server. I am using the following steps: The client ...
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2answers
181 views

Is RIPv2 MD5 authentication insecure?

While performing a vulnerability assessment, I stumbled upon RIPv1 poisoning routing table attacks. The recommendation is to use RIPv2 with MD5 authentication. The idea is that the routes need to be ...
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77 views

How can we find server location and IPs? [closed]

Is it possible to find where some known application servers (such as whatsapp) are located and their IPs ?
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3answers
4k views

How likely is it that I was hacked by running a local server for development?

Over the last couple of days I've been learning Apache and servers in general - I installed Apache, PHP and mySQL on my Ubuntu system and accessed my website with 'localhost'. I have always thought ...
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1answer
343 views

SSH and man-in-the-middle

Assume the following scenario and please correct me if I am wrong somewhere: There is a client and there is an SSH server that the client connects to. There is also a man-in-the-middle (MIM) which is ...
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38 views

Kerberos Protocol Centralized Server

If a small company is expanding with various branches across the country, how would the kerberos centralized server be configured? Are the new users assigned new ticket granting servers or are they ...
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4answers
117 views

Prove a client sent a request - voting system

Let's say I created a voting system where each voter would use an app and vote on a candidate. The app would send the vote to a server. The server would store the vote on a DB with the request IP. Is ...
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1answer
28 views

Why do processes on servers have socket types associated to the port number? [closed]

Why do some servers have TCP/UDP alongside the port they're listening to. To my understanding TCP and UDP are socket layers, they're methods of determining how the traffic is being sent over the ...
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1answer
120 views

For servers that are not internet facing, do they need to be authenticated to each other and should their communication be over HTTPS? [duplicate]

My gut instinct is that best practice would be to ensure that all internal servers communicate over HTTPS and that all servers are authenticated to each other. That would indeed be dream case ...
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163 views

Security-wise, is an in-browser JavaScript implementation fundamentally different from a server-side language (e.g. Python) implementation?

As I understand it, JavaScript implementations running in browsers need to run untrusted code and operate on untrusted data in a secure manner. Language (e.g. Python) implementations running on a ...
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1answer
301 views

Manage Logs of Excessive Member and Server Authentication Failures

Currently, in our SIEM environment, we are attempting to reduce noise and any non-actionable items. One of the most frequent items we receive on a weekly basis is a report based on excessive member ...
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1answer
49 views

samba server exposed to wan

I recently realized that my samba server was exposed for about 3 years to the wan (ports opened and smbd was listening). I made a mistake when I configured my firewall and failed to check it. This ...
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5answers
59k views

Possible to use both private key and password authentication for ssh login?

It seems that they are mutually exclusive, as disabling one gives me the other, and vice versa. Two-factor auth for my ssh servers sounds really nice, so is there any way to accomplish this?
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1answer
177 views

How to protect data in case of an unauthorized physical access to a server

I have some VMs on a hypervisor. They run linux with full disk encryption. In case of an unauthorized physical access to a running server, I know that the attacker can extract passcode out of RAM via ...
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2answers
278 views

Testing RCE and SSRF using Python SimpleHTTPServer [closed]

Is it possible to test RCE and SSRF vulnerabilities using Python SimpleHTTPServer? Or should I use a VPS server?
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Is SQL injection still a thing? [duplicate]

I was wondering whether SQL injection is still a thing or if it is mainly extinct due to the fact that I don't hear about corporations being hit by this vulnerability, And the last time I heard an ...
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2answers
51 views

When is an email rejected?

Currently, I am working on a web application and wanted to let users send emails to others through a web form. So, they just should submit their email address and my web app would then send mails to ...
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213 views

Can NIDS alone protect the Servers in our network, or we need HIDS application as well?

I have problem with some institute server. The scenario is like below. There is an institute (Government/Corporate/Industry) that have their own dedicated server. But there is no other security ...
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2answers
849 views

how to check if my server has been hacked [closed]

I have a couple of Ubuntu 16.04 servers. I want my server to be secure and ensure they can only be accessible by me and things. I check the auth.log and last. But I heard that hackers can change the ...
5
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1answer
189 views

Working on sensitive data on the cloud

In my current project for an NGO, I have to set up a system that allows members of the organisation to perform basic analysis on highly sensitive data. The data (reports, or form submissions) is ...
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3answers
1k views

How to detect a DoS attack if today all use network address translation?

If a basic DoS attack can be handled by limiting the number of connections that occur in a interval of time with one IP and some enterprises and institutions use network address translation with many ...
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2answers
551 views

Server Side request forgery (SSRF) explanation

I am looking to gain a better understanding of the SSRF vulnerability. I have googled and watched YouTube tutorials but they all show advanced techniques that are difficult to understand. I am ...
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1answer
232 views

What can I do with physical access to a server?

I am taking a Sec Lab class and we've been sectioned into teams and tasked with 'attacking' the other teams while 'defending' against them. Each team is set up with 4 VMs, and we have a few days to ...
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0answers
39 views

Secure Server start up [closed]

From the server implementations that I have seen, people normally use a properties file with all the passwords (that may be encrypted with hardcoded key(s)). I have therefore, created a server that ...
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1answer
1k views

Man-in-the-middle packet injection

I'm currently studying the possibility of a man-in-the-middle attack in a network consisting of a switch and 3 computers: Server/Host Client Man In The Middle The server and the client will change ...
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3answers
666 views

How to externally backup a fully encrypted disk partition

For a kind of NAS/server running Ubuntu with SAMBA to host files for several Windows computers, I would like to encrypt the files on the server. I know I could do this for the partition using ZFS or ...
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5answers
8k views

Does changing an uploaded executable's file extension to .png render it safe?

A colleague of mine has a personal website in which he allows users to upload anything within a certain size, but before the actual upload he checks to see the file extension: if ( $type == 'image/...
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2answers
93 views

Internal Server to Server Authentication Using a Single Token

One of our security mandates require authentication between servers when transmitting data. These API endpoints are only accessible within the internal network and are never exposed. Our idea is to ...
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2answers
526 views

What is this SSH attack, am I hacked?

I see this in my Ubuntu server's log file: in my ssh my user is root but i see other user Disconnected like "teamspeak", what does that mean? auth.log Jul 3 21:39:01 vmi189193 CRON[25937]: ...
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2answers
105 views

How to verify server ownership by public IP (without associated domain)?

Company A has a set of servers with public IP address but not associated with any domain. The servers contain confidential information, so company A doesn't want to give access to 3rd party. Company ...
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0answers
1k views

can ping the server but not able to access [closed]

i am able to ping the server machine named "tallyserver" which is windows server 2003 machine configured with automatically IP address setting but when i am going to Network, sometimes it shows the ...
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3answers
4k views

How to protect our server from brute force attack? [closed]

One of the most common cyber attack is Bruteforce , what are the mechanisms available to protect this attack and how industry apply these mechanisms to mitigate the attacks (best practices)?
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2answers
500 views

Use mining to prevent DDOS attacks on websocket: Is this a viable solution?

I'm thinking whether the following way is a good way to completely and totally prevent ddos on my server. My idea is to use the same mechanism of cryptocurrency mining (bitcoin, with sha256 or any ...
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2answers
2k views

How to use YubiKey through GnuPG on remote server?

I'm wondering if it is possible to use a Yubikey to unlock for example a GnuPG key on a server, so can I somehow pass the generated token from the YubiKey over SSH to the server in an easy way?
3
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3answers
853 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 ...
45
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3answers
6k views

How do hosting providers prevent the compromise of one website from causing the compromise of another one?

Could one create a vulnerable website on purpose to attack a server of a hosting provider? So in the question above which I recently asked we came to the conclusion that preventing one vulnerable ...
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2answers
519 views

Could one create a vulnerable website on purpose to attack a server of a hosting provider?

Is it possible for a vulnerability in one application to be exploited to attack another application on the same server? So according to the answer to the question above it is possible that when one ...
5
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3answers
8k views

Jump Servers for security

In my network, I have the clients directly connected to the server; but in the new PCI policies, they required to use jump servers. What is the advantage of using jump servers for security reasons? ...
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1answer
1k views

What is a decoy-server?

I see that the term "decoy-server" is often used but I am not able to find a more formal definition for it. Can someone help? E.g https://scholar.google.com.sg/scholar?hl=en&q=%22decoy+server%22&...
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1answer
403 views

Authentication process between the server and the browser [duplicate]

How the browser ensures that it is communicating to the right server?
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1answer
116 views

what type of server is best for launching a vulnerable application on an Organization network? [closed]

For a demo purpose i need to install a vulnerable application and i tried using XAMP server but it opens up many ports and not safe to use it. so please recommend a server to launch a vulnerable demo ...
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2answers
135 views

What to review for server decommission?

I’ve read that the information security teams should be involved in the decommission process for servers (for example this answer or this sample process guide). They are supposed to review and ...
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0answers
70 views

What additional protection required for authentication and messages sending in addition to TLS? [closed]

I use TLS for securing my client-server TCP communications. I have a Qt server and Android and iOS clients. For TLS connection I use only server side certificates, so only clients sure that they are ...
5
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1answer
179 views

Is it acceptable for security engineers to have admin access to production servers?

In my organization, our server infrastructure team has historically held all admin access to production servers. We're recently trying to strengthen our security posture, so we have hired several new ...
1
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1answer
52 views

Opened port leads to a collection listing

I've been doing some searching on a macOS server and have noticed that there's an open port that I am able to access outside the network. When I go to this port it will ask for a username and a ...
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1answer
113 views

Is a strange test.cake file on my server a sign of a compromise?

On a clients shared hosting I found a file called test.cake in the admin folder. It's pretty big, 353 KBytes, and contains this: execve("/usr/local/bin/php", ["php", "login.php"], ["GREP_COLOR=1;32", ...
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2answers
243 views

How secure is this communication chat?

I have created a chat between two parties (using c#), and I am wondering what kind of weaknesses have I overlooked. Description of its functionality: There are two individual applications: Client (2 ...
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2answers
835 views

HTTPS Proxy Content Inspection [closed]

Is it possible for a proxy server to do content inspection on HTTPS traffic?