Questions tagged [ubuntu]

Ubuntu is a Linux version derived from Debian. For questions about Ubuntu that are not about security, please post on [AskUbuntu.SE].

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36 views

Laravel | Why create a public_html folder and link/move it?

I am using laravel on shared hosting. Under my domain in my folder is the laravel app. Now I see online that many people do weird stuff with the laravel public folder, they either move it to a ...
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2answers
89 views

How safe is dm-crypt/LUKS? Would TPM make me more secure in this case?

I’ve been looking to purchase a new laptop and I need to have security in mind. I’ve specifically been looking for laptops with discrete or integrated TPM because it’s been my understanding that TPM ...
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5answers
4k views

What are the potential vulnerabilities of allowing non-root users to run apt-get?

There are two ways I can think of doing this: On a system with sudo, by modifying /etc/sudoers. On a system without sudo (such as a Docker environment), by writing a program similar to the below and ...
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2answers
652 views

Constant POST request spam to /cgi-bin/ViewLog.asp endpoint

I've got a DigitalOcean server that I use for different temporary servers. Lately I've found that sometimes I get a constant spam of the following requests: POST http://127.0.0.1/cgi-bin/ViewLog.asp ...
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1answer
107 views

If someone steals my unencrypted, password protected laptop, would they be able to get into my Google account?

I have a laptop with Ubuntu 20.04 operating system. I am logged into my Chrome browser using my Google account. This means, every time I open my browser, I am already logged into all the Google ...
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2answers
78 views

Encrypt backup files and send them to AWS S3

I have a backup routine via crontab on Ubuntu. This routine generates a compressed tar.gz file and sends it to AWS S3. But I want to encrypt these files and be able to decrypt them when necessary on ...
46
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4answers
13k views

Aren't keyfiles defeating the purpose of encryption?

I just added a drive to my system which is basically a partition mounted for extra storage. I'd like to encrypt it to protect my data in case of god knows what, and by doing that I'd need to enter the ...
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2answers
51 views

How to detect malicious files or web shell on a vps web server

How is it possible to detect malicious files or web shell on a vps web server? I used to use a shared hosting, and when I tried to upload any malicious code for testing it got deleted automatically. ...
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1answer
74 views

How to secure an IoT device

Which is the proper way to prevent users to read sensible information stored inside an IoT device (e.g. source code / private keys...)? Fully disk encryption is of course an option, but is it ...
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1answer
52 views

Loopholes in secured file server

My system to share private data works like this: I rent a virtual server at a hosting company. There I have a self-signed certificate installed. The folder with the files inside is password ...
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1answer
52 views

VPN as a firewall in a public network

My configuration is: allow only OpenVpn traffic and block any other (income/outcome) traffic with UFW on my ubuntu laptop. unreal scenario: let’s say i have ubuntu with chrome version 50 [2016] on ...
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8answers
4k views

Is a firewall enough of a security measure for an Ubuntu server that hosts a website?

I recently got a VPS with Ubuntu on it, and I'd like to start creating a very basic website. However, I don't know what steps I should take to secure this server. I'm new with Ubuntu, new with ...
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1answer
54 views

Are security scrutinies conducted by independent agencies on open source software like Ubuntu or Mozilla Firefox?

Any intentional malware injected into open source software by the same people who are developing them may eventually get known as the source code is open to the public. However, if the code base is ...
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2answers
112 views

How to protect my ubuntu linux computer from screen capture programs or keystroke loggers?

I have a Ubuntu home PC. I often use this system to enter passwords to various websites. Some sites also offer a graphical on screen keyboard to protect from keyloggers. However, I suspect that even ...
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3answers
241 views

Have I been pwned? Public SSH with key

I have a dedicated server with public IP address, opened port 22 and fail2ban running. I am using root account (I know it is wrong but I have to) and I have disabled logins with password. I am using ...
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0answers
35 views

Updating Ubuntu [duplicate]

How can I make sure in the terminal that my Ubuntu updates are from the real source? I am asking because I know that one download was fake. It was rkhunter. The update was malware. Done from Bangkok....
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0answers
46 views

Bypassing non-writeable permissions on Ubuntu server

Say I have gained RCE on a server which has a firewall blocking all egress traffic: Linux cmweb6 4.15.0-1040-azure #44-Ubuntu SMP Thu Feb 21 14:24:01 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux But I am ...
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1answer
119 views

Fully-secured screen lock in Ubuntu with encryption

I have Ubuntu 19.10 with full disk encryption. The encryption is effective as long as the system is turned off or restarted. Otherwise the data is unencrypted behind a locked screen which may not be ...
3
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1answer
103 views

How to keep backup servers safe?

I use duplicity on a few Ubuntu servers to encrypt backups and send them to a backup server, which then sends another copy to rsync.net, and then, once a week, give it or take, I download these ...
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1answer
91 views

Maintaining root SSH access on Linux Ubuntu even after losing it? [closed]

Consider I have root ssh access to a Linux server (Ubuntu 18.04 LTS). What is the best way to maintain access even after losing ssh access? Are there any tools out there to help maintaining ...
20
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5answers
4k views

How to use FDE without needing to share the encryption password

We have an AI model which needs to be deployed on premise. The hardware will be provided by us, so we can do what ever we want on the device. The device is a mini PC running Ubuntu 18.04. The UI is ...
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0answers
60 views

How to do a SSL MITM for all programs trying to access the internet on my local Ubuntu

How to do an SSL MITM for all programs trying to access the internet on my local Ubuntu. When a program on my local machine tries to access the internet using https I would like to intercept and ...
6
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1answer
99 views

Printing document on usb drive with confidential information on multi user computer

I have a pdf file with confidential information on a usb flash drive. This document needs to be printed on a multi user Ubuntu system. I want to prevent other users from seeing the content of the ...
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1answer
37 views

UFW Blocks some IPs which are trying to attempt a connection to the server

UFW‌ Blocks some IPs which are trying to attempt a connection to the server. I checked most blocked IPs in abuseIPD website and all blocked IPs are reported for brute force attack and/Or ssh spamming ...
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1answer
85 views

metasploit openvas plugin not connecting to OpenVAS9-Manager

I recently installed openvas9 following this guide. I can log into the web interface on port 4000 just fine, and I ran a scan on my metasploitable VM for testing, and it seems good. Now I wanted to ...
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0answers
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
290 views

For security purposes, can I use vpn with ufw to allow traffic only from the vpn on ubuntu?

Is this possible? If not through ufw then some other software or iptables? How should I set up the ip tables? Assuming my public ip is known (and I don't want to change it), would it provide complete ...
0
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1answer
88 views

Can a malicious optical disc infect Ubuntu without user action?

Assuming that a malign user has unlimited resources at his/her disposal to infect a computer running Ubuntu, but he/she is only limited in transferring the malware through an optical disc (CD, DVD, BD ...
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0answers
34 views

Saved browser login information disappearing [duplicate]

I recently noticed that my browser (Chrome) is not saving my login state for websites anymore. The first time it happened I didn't thought much of it but it happened again and again. I also noticed ...
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0answers
84 views

Find files with autopsy [closed]

I had an Ubuntu 14 machine. A couple of days I installed Ubuntu 18 on this machine. I'm trying to recover some files from the previous installation. I'm using autopsy. I think I'm doing something ...
3
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1answer
239 views

Is suspend-to-ram really a meaningful risk for Full Disk Encryption?

Ubuntu offers full disk encryption relying on luks. An often recurring area of criticism is the fact that Ubuntu disables hibernation by default while suspend-to-ram stores the private keys in the ram ...
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2answers
109 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?
2
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1answer
706 views

Cannot exploit stack-based buffer overflow with ASLR-disabled, since RSP differs heavily between executions?

I have made a little toy program, compiled with ALSR disabled, that I want to exploit using stack-based buffer overflow: // gcc stackexec0x1.c -Wl,-z,execstack -no-pie -fno-stack-protector -o ...
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2answers
630 views

How to get result from airdump-ng on Ubuntu 18.04 LTS?

Issue: when I run airodump-ng wlp3s0mon, no results appear. I recently installed all kali linux tools on Ubuntu 18.04 LTS from this git repo https://github.com/LionSec/katoolin My chipset is the ...
1
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1answer
134 views

Permissions for Azure OMS Agent files

I have two files that the Azure OMS agent reads/writes from that are world writable files. Our vulnerability scanner (rapid 7) is picking these up as vulnerabilities. It's also poor practice in ...
2
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2answers
261 views

Would an Ubuntu server accessible from the internet be hacked within days?

I created an Ubuntu server on Digital Ocean to deploy my app on. Less then 24 hours later, I log in to the server and see this: 18 packages can be updated. 7 updates are security updates. I install ...
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0answers
41 views

Is it possible to contract a virus on Ubuntu/Debian from an Apache Nutch web crawl?

For the fourth time now I have contracted a virus while doing a large web crawl on webmd.com. I'm not certain that this is where the virus is coming from but I don't see what else it could be. Is it ...
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0answers
41 views

There are cached icons and screenshots from another person, am I hacked? [duplicate]

I'm running Ubuntu bionic 16.04 LTS and there are being constantly added new files into the ~/.cache/gnome-software/ directory. I've uploaded all of them into this new GitLab repository, so that you ...
1
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1answer
437 views

Is it a security risk to run master process of nginx as root?

I'm using nginx (Port 8888) as a reverse proxy for my web server running over 8080. In the traditional way, nginx master process runs as root and spawns the child processes with user www-data. Is it ...
-1
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1answer
320 views

Would sniffing all network traffic from android device to check for spyware be a viable solution

I suspect that my Google pixel (Android 9) phone has some sort of a spyware installed. There are no obvious symptoms like overheating, extreme data usage, or battery draining at an unusual rate. But I ...
3
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3answers
8k views

New Linux virus “watchbog”. What could be the cause? [duplicate]

This question had already been brought up here, but was poorly answered with generic answers, like reinstall everything and no actual solution and cause. So here's my story: There is a new virus out ...
0
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2answers
284 views

Security best practises for my first ever Node, Mongodb, Nginx production app on a Ubuntu VPS

So as the title says I'm just deploying my first ever app in production. Because I don't have experience, I was told to ask someone who knows this stuff. So how should I ensure the best security for ...
0
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1answer
153 views

How can I found a source of HTTP request in Wireshark?

There are weird requests to/from the AWS: and another one to/from 177.143.198.104.bc.googleusercontent.com: ( http://whois.domaintools.com/177.143.198.104 ) I use Ubuntu 18.04 Desktop, web browsers ...
1
vote
1answer
325 views

dhclient cloud-init /var/tmp process

There's a process that's running that I'm trying to investigate why its running and what its doing. The server is a Linux Ubuntu server running on AWS. Running 16.04. The process in question is: ...
3
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1answer
181 views

Do openssl CA certificates get updated with apt-get upgrade?

I use Ubunut 18.04. I need to know if OpenSSL CA certificates that are in this file: /etc/ssl/certs/ca-certificates.crt get updated when I upgrade my system using: apt-get upgrade? I have a ...
0
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2answers
276 views

Boot from live usb to avoid being spied on

Suppose the government wants to spy on you using government-designed malware. If you then want to visit sensitive pages on the internet, would it be more secure to use Tor browser within a USB - live ...
2
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2answers
214 views

How do i know if my ubuntu apache version is secure?

I am running Ubuntu 16.04 LTS and checking dpkg -l apache2 gives me version 2.4.18-2ubuntu3.9. How do i know that 2ubuntu3.9 has the latest security patches listed here at https://httpd.apache.org/...
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1answer
2k views

How to switch from Ubuntu 18.04 to kali linux? [closed]

I am using now ubuntu 18.04.1 and i wanna make dual boot with kali linux. How to do that?
44
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5answers
18k views

Should I close port 80 forever and ever since the 2018 Google-indicated web-security initiatives?

I often establish Ubuntu-LAMP environments on which I host a few Drupal web applications that I myself own (I don't provide any hosting services and never done so in the past). Whenever I establish ...
2
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1answer
217 views

Containerization vs. Chroot in shared hosting

Forgive my rudimentary understanding of server security, but one thing I've always struggled with was understanding how to setup chroot to separate folders (which are discrete WP installations) in a /...

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