Security covers a wide-ranging set of topics including Users, Permissions, Authentication, Authorisation, Upgrades, Firewalling, Hardening, etc.

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12
votes
2answers
1k views

Do I need to install Security updates for Ubuntu base?

I installed Lubuntu 14.04 LTS from a disc and have added updates.System info shows 14.04.2 LTS. Software updater >security updates offers Ubuntu base 103MB. Do I need to install this?
2
votes
1answer
14 views

How do I know if the programs used in PlayOnLinux can be safely installed?

I'm seeing this large list of mostly commercial programs there and I'm wondering where they came from, if I run the risk of compromising my system by installing any of them.
1
vote
1answer
21 views

Security - Apache's websites folder inside Home folder

Is it secure to change DocumentRoot path to some folder in user's Home directory? Or it's better to leave it be and using a shared group between your user and Apache server as you can see it in the ...
5
votes
3answers
6k views

GUI program to shred or wipe files with options to make sure they are unrecoverable?

I have a quick question about file shredding. Is there any application with graphical interface capable of shredding files and folders? I know bleachbit has that feature but there are no options or ...
0
votes
0answers
12 views

Encryption enabled on Ubuntu Snappy Core

Is there any kind of encryption enabled by default in the latest Ubuntu Snappy Core release? Is the home dir encrypted? or other locations?
1
vote
0answers
24 views

Why doesn't the admin always run an admin terminal? [duplicate]

If I'm the admin, is there a benefit to using sudo in front of every command that requires it instead of just turning on root access with sudo -i and not worrying about it?
0
votes
0answers
17 views

Running user code in extremely restricted folder

I am trying to set up a web server for students. Students will upload a cpp file, which will then be compiled and tested. I need to do this through a web interface, so students won't have their own ...
0
votes
0answers
25 views

PCI compliance/scan company that supports Ubuntu? [on hold]

We are starting a project in which we will need to scan and get PCI compliance certification for 4 nearly identical Ubuntu servers. I did some preliminary work on this last fall using Trustwave and ...
4
votes
1answer
51 views

What is the danger of running untrusted softwares as a normal user

Sometimes I have to use some propriety softwares which I don't trust in them and in their behavior. Lets say we installed a propriety software in /opt/software, then we run it as a normal user (...
0
votes
1answer
24 views

Best backup approach for a USB drive [on hold]

I'm currently using the grandfather, father, son approach to create backups of my everyday usb drive which I always carry around with me. The full drive is encrypted using dm-crypt and I use dd to ...
0
votes
1answer
30 views

How safe is luks?

I constantly think about encryption, and how safe it might be. The general information I have tends to be secured by passwords that range in the hundreds with random key combinations in between random ...
0
votes
0answers
8 views

access and security keypair download

is there a way to download/export a keypair (not import) that is showing in the security section, or at least a way to access it? We need it to ssh into the boxes. Thanks,
0
votes
0answers
95 views

How to Set-Up WOL with Intel 82574L?

I am setting up a Ubuntu PC which I only need to do Matlab computation efficiently through VPN connection. My network card should be ok (Intel 9301CT where processor Intel 82574L) which Ubuntu ...
0
votes
1answer
41 views

PSS software for Linux? [closed]

In order to control a CCTV camera, I have to install a software some recommended me PSS, Pro Surveillance System (Surveillance CMS software), which supports both analog and digital recorders. Dahua ...
-3
votes
0answers
30 views

Can malware (virus, trojans, etc.) operate within Ubuntu which is not connected to Internet? [closed]

Pretty much sums the question. I have newest Ubuntu installed on a laptop which has a network problem, so can't install scanner either. Can malware (virus, trojans, etc.) operate within Ubuntu which ...
1
vote
0answers
20 views

How are snap applications being protected?

How are snap applications being protected when we look at different aspects? Runtime protections? Memory protections? Differences to ordinary processes? Differences to VMs? Storage protections? ...
1
vote
2answers
57 views

Can you empty cached items from memory without needing to close Firefox?

I currently have Firefox set up so that a persistent cache is not stored after closing Firefox. I only have the memory cache enabled which it empties when Firefox is closed. Sometimes I need for ...
23
votes
4answers
70k views

How to disable IPv6 permanently?

How can we disable IPv6 system wide via terminal commands? I've read editing /etc/modprobe.d/aliases and replacing: alias net-pf-10 ipv6 with: alias net-pf-10 off alias ipv6 off Is this safe ...
0
votes
0answers
14 views

Prevent Outbound IP Address spoof

We have multiple computers running Ubuntu Desktop, all connected to same Router. Using UFW firewall, all inbound and outbound ports are blocked on these Desktops, except for only one outbound port (...
0
votes
0answers
25 views

Add a repository for security testing

I want to use some security tools because I study security (A total beginner). I tried adding the repos of kali, and install some security tools from there, the security tools works great but I had ...
2
votes
1answer
2k views

How to show all files created on a specific date?

On 16/05/2015 at 17:18 I visited a malicious website. And I suspect a drive-by-download, so I want to check my machine to see since that time in order of creation which files have been created or ...
0
votes
0answers
41 views

How to use iptables to prevent repeated attacks on port 80?

There a is massive attack on port 80 on my Server i try to use iptable This way to banned attackers iptables -A INPUT -s 212.252.96.128 -j DROP but there are too many IPs attacking how to prevent ...
21
votes
2answers
26k views

chkrootkit says /sbin/init is infected, what does that mean?

I recently ran chkrootkit and got the following line: Searching for Suckit rootkit... Warning: /sbin/init INFECTED What does this mean exactly? I heard this was a false positive, ...
0
votes
0answers
46 views

username/password. [duplicate]

I just updated ubuntu from 14.04 to 15.10. Now when I boot up ubuntu asks for username/password. I entered what I thought was correct, but the system says it is incorrect. I can't get past this - is ...
20
votes
5answers
32k views

GUI for iptables?

I would like to secure my server and it seems that IPtables is one of the first steps. Unfortunately editing the rules in a terminal is a bit complicated and dangerous (those who ever did an iptables -...
81
votes
12answers
82k views

How to harden an SSH server?

What measures can/should I take to make sure that security around my SSH server is absolutely impermeable? This will be community wiki from the start, so lets see what people do to secure their ...
0
votes
0answers
27 views

ubuntu feature?

I started receiving discourse on my display re: icc profile file updates relating to the display. I was nowhere near the software update manager, just doing some general surfing. I started getting ...
0
votes
1answer
147 views

Why I can't login without a password in my encrypted account?

I have an encrypted disk, and I get asked for a password before reaching the login prompt, then again to log in. As I have only a single user account, the password to which is the same as my disk ...
1
vote
2answers
49 views

What are the dangers of using an unsupported Ubuntu version? [closed]

Non-LTS versions of Ubuntu only receive security updates for up to 9 months after their release (for Ubuntu 15.10, until 07/2016) and are not recommended for use after the expiration of the support. ...
0
votes
3answers
2k views

Are there any good antivirus for Kubuntu/Ubuntu as of 2015? [closed]

OK, I do have to admit I am somewhat new to Linux,(I'm used to Windows), and that's why I'm asking all of these questions about Kubuntu. As of 2015, are there any good, FREE anti-virus programs for ...
3
votes
1answer
121 views

How to use SSL and SASL with irssi under Xenial Xerus?

I would like to connect to Freenode with irssi using both SSL and SASL. Instructions for using the script cap_sasl.pl that worked for older versions of irssi now show the following error under Xenial ...
4
votes
1answer
98 views

How is the guest account prevented from using su and sudo?

It's already known that the guest account can't use su or sudo: Why is su disabled from guest sessions? Sudo not available in guest login How is this done? My guess would be apparmor. However, ...
10
votes
3answers
2k views

How to secure grub recovery mode

When I boot system in to recovery mode from GRUB menu, I can get in to all powerful root without entering any password, thus insecure. How I can secure this and ensure that a password is asked every ...
5
votes
6answers
6k views

How can I encrypt my internet traffic so I can use public wifi securely?

I have moved to a hostel and they provide WiFi network. I would like to be safe on that public WiFi network. Is there any way to encrypt my data transmission to and from the router ? I am a bit ...
29
votes
4answers
4k views

How to block input to webcam?

When I was running Windows 7 on my Lenovo machine there was a pre-installed Lenovo utility which would make it so that anyone trying to see what my webcam sees would instead see a still image of a ...
1
vote
1answer
38 views

Ubuntu Touch - Screen locking fade issue

On my Ubuntu phone, I have set my screen lock to come on after a minute of none use. This is in the Settings > Security & Privacy > Locking & Unlocking. The lock does come on as requested ...
122
votes
8answers
88k views

How to delete file(s) in secure manner?

Is there a way to make sure that a deleted file can not be recovered? As you know, deleting a file by pressing shift-del or using trash doesn't mean that file is gone forever. It resides somewhere ...
-1
votes
0answers
29 views

administrative password changed after losing but now doesn't login

I did the recovery mode then root then after receiving authentication token manipulation error I did the mount remount then chmod 640 /etc/shadow then when I tried the recovery on root passwd '...
10
votes
4answers
40k views

How can I open Java's Control Panel?

How can I open Java's Control Panel to change the security settings?
3
votes
3answers
299 views
8
votes
2answers
50k views

Can I install Kali tools on Ubuntu?

I want to know if there is any way to install Kali tools like sqlmap, nikto, john, aircrack-ng, ... on Ubuntu 12.04? If yes, then how should I proceed?
1
vote
0answers
33 views

Security of JBOD vs RAID while there is no backup

I have some large amount of data (~40 TB) consisting of small files. The data is currently stored on JBOD. Because the data is not super important and I cannot afford the needed disks there is no ...
2
votes
1answer
50 views

i3wm screen locking security issue

I am using i3-wm on Ubuntu 16.04. I am locking the screen using dm-tool lock, and it looks good, but I noticed you can circumvent the lock screen by switching a TTY (Ctrl+Alt+F1) and then switching ...
0
votes
1answer
3k views

Help connecting to my schools wireless network

My school´s hates everybody that dosen´t run Windows 7/8. Therefor, they will not give me support in connecting to my School´s wifi, which i need badly. I have a guide for Windows 7 and I hope that ...
0
votes
0answers
25 views

Harden Ubuntu Server 14.04

I have a personal server I primarily use for downloading media. Besides hardening ssh, I was wondering if there are any other preferred means to securing the rest of the server, virus', so forth and ...
0
votes
0answers
21 views

Ubuntu 14.04.4 LTS: Firewall - block countries

I'm having trouble with my VPS. IPs from both China and Russia is trying to brute-force my VPS (not like there's anything interesting), and it's annoying. I'd like to ask, if there's any way I can ...
0
votes
0answers
13 views

How to blacklist certain commands from aliasing? [duplicate]

There are certain important commands I use a lot such as sudo, cd and ls which if malicious aliases were created of could cause some major problems, especially with the first listed. And I know that ...
8
votes
2answers
92 views

Is the lock screen secure?

I have a fully encrypted drive so I know when my laptop is turned off that nobody can access my data but what about when the screen is locked with my root password? It is often impractical to turn ...
5
votes
5answers
1k views

How to ensure Wine does not auto run .exe files?

I want to install Wine only for running a program, but I don't want to open any other Windows file (for security). Is it possible to ensure Wine does not execute .exe files automatically? Thank you.
4
votes
3answers
531 views

Is the lock screen secure enough to prevent “Mallory” from accessing the encrypted drive?

I use truecrypt to encrypt one of my drives and I would want to leave the computer running processes that use information of that drive while I'm not home, I've tried suspending it but everything ...