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

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2
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2answers
44 views

Where to store a Keepass password file?

Where would you recommend me to store a Keepass file? Usually I have my personal documents in my Dropbox account. Would it be safe to use Dropbox for this file?
-1
votes
0answers
6 views

Creating and Sharing an encrypted drive and be able to access it from a network

I hope that question made sense! Here is what i am trying to do. i have an Ubuntu 14.04.1 server/htpc/desktop. I use it as cloud storage and to stream to my tablets. It has two physical drives and i ...
7
votes
1answer
168 views

/var/log suspicious entries

For fun I tailed /var/log/auth.log (tail auth.log) and there were many of the following: sshd[16225]: Received disconnect from 203.100.83.32: 11: Bye Bye [preauth] The ip appears to be from ...
0
votes
1answer
13 views

How can you test for a DNS leak for an OpenVPN provider?

I'm currently using VPNBook with OpenVPN. I just recently learned about DNS leaking. Is there a way to scan for it?
0
votes
1answer
15 views

How do I unlock system tools such as users and date and time

I'm using Ubuntu Server 14.04 with Gnome and suddenly I can't unlock system settings such as Users and time & date: the unlock icon is grayed out even though I'm an administrator and terminal ...
0
votes
1answer
76 views

Package with bad signature got instlaled on second try: how?

I executed my daily sudo apt-get update && sudo apt-get upgrade command, and got a bad signature error when hitting google chrome: Fetched 2178 kB in 2s (981 kB/s) Reading package lists... ...
0
votes
1answer
30 views

Can I install all the hacking tools of KALI on Ubuntu12.04 LTS?

I want to know is there any way to install all hacking tools of kali on ubuntu 12.04 ? If yes then pls tell me how ? like sqlmap , nikto , john , aircrack-ng etc . Thanks.
0
votes
1answer
26 views

Do I stick with 12.04 lts or upgrade to 12.10 or higher?

I recently bought a laptop with ubuntu 12.04 LTS. I have only used windows so far, so I admit I'm a noob at ubuntu. Since I only need it for reading, writing papers, entertainment and communication, ...
1
vote
2answers
32 views

A Software Center review claims Ruby has a virus. Is it accurate?

I'm working on a Javascript webapp and trying to figure out how to add documentation. It seems like the only option is to install something that lives on a server. I thought maybe I'd try JSDuck. It ...
0
votes
0answers
7 views

ima-evm in 14.04 server?

I was looking for an Ubuntu-packaged ima-evm-utils for Trusty server (amd64), but no luck. (It is available in 14.10.) While I can build this from source, it would be better to have a supported ...
1
vote
0answers
11 views

How to config PORT KNOCKING on CSF ubuntu server and access it by linux?

I'm trying to run port knocking work on a CSF on a small VPS, i setup this: 1 - the result of csf first test ok 2 - TCP_IN = "53,80" TCP_OUT = "53,80,113,443" UDP_IN = "53" UDP_OUT = "53,113,123" ...
0
votes
0answers
39 views

Ubuntu and Crouton on a Chromebook security worries [on hold]

I have installed Ubuntu with crouton on my acer c720p chromebook. According to the crouton wiki, it is not safe to run but I would like to understand why it is unsafe and which measures can one take ...
0
votes
0answers
19 views

How can I use public-key encryption for luks?

I have been running luks with the following commands: $ sudo dd if=/dev/urandom of=/keyfile bs=1024 count=4 $ sudo cryptsetup luksFormat /dev/XXX keyfile $ sudo cryptsetup luksDump /dev/XXX And it ...
0
votes
1answer
17 views

Wrong timestamp in syslog

I was taking a look on my syslog, and I found this: Nov 30 22:30:01 nori-hidamari NetworkManager[963]: <info> (wlan0): canceled DHCP transaction, DHCP client pid 2580 Nov 30 22:30:01 ...
0
votes
0answers
30 views

Is bash safe yet on 10.04?

Running shellshock test from https://shellshocker.net/ on updated 10.04.4 LTS 32.bit says it is still vulnerable to CVE-2014-7186 and CVE-2014-7187 CVE-2014-6271 (original shellshock): not vulnerable ...
0
votes
2answers
32 views

Can anybody read my password protected hard drive files using my hard drive as secondary hard drive?

So i have a laptop with ubuntu as OS. now can anyone having physical access to my hardrive ,see my data just by simply using it as secondary hard drive in another laptop or machine?
0
votes
0answers
11 views

How to set up apt-get ssh transport with chroot

I want to set up a private APT repository that is only accessible by a shared public key, via the ssh transport. The only problem is, this also gives ssh access to the machine. I would therefore like ...
1
vote
0answers
26 views

Application Whitelisting

How does an Ubuntu administrator implement application whitelisting? For example, if I create a LAMP server and I only want SSH, Apache, MySQL and PHP to be able to execute. How can I prevent any ...
0
votes
1answer
34 views

Every installation on desktop asks for passwords that I never set in the first place

Everytime I boot up and try to log in using ubuntu, it asks for a username and password: which I have never set in the first place. So I log in under guest account. But when I try to change ANYTHING ...
0
votes
1answer
22 views

Can I make Apache more secure by removing read access from the others group?

It says in the Apache documentation security tips to set your server root directory and sub-directories to be owned by root, with a group of root and to not be writeable by non-root users. However it ...
0
votes
0answers
23 views

Ipsec connection fails between two hosts

I have two systems: Host1 (IP address - 10.1.0.1) and (Host2 IP address - 10.1.0.2) I configured IPsec on both machines as below: Host 1 config (/etc/ipsec-tools.conf) #Host 1 /etc/ipsec-tools.conf ...
0
votes
1answer
18 views

Can program crashes during development affect my system's security?

I have been using Ubuntu for some time, and I loved it! I'm feeling way more safe now. But, I'm a Computer Science Student, and I have to code a lot. And I have been creating various codes, and it ...
0
votes
0answers
9 views

IPsec XFRM bridge

I am new to IPsec, am trying to learn about XFRM bridge acutely. But am not getting enough information around the internet. Can someone help me by providing informational data and links regarding XFRM ...
1
vote
1answer
27 views

Display PPA from which package will be downloaded during upgrade

I have many PPAs installed on my Trusty system. However, I feel that they might try to sneak packages into my system other than those which I include them in the first place. Technically, after adding ...
12
votes
1answer
203 views

How to block specific apps from opening in specific accounts

How to block certain applications from opening on certain accounts (eg: Stop account John from opening Firefox or Gimp). It is assumed this is for the GUI and not the terminal and would only apply to ...
10
votes
2answers
748 views

How do rootkits get installed on to a ubuntu server?

I've seen a few posts on checking for rootkits but haven't been able to find any information on how they get onto a linux system. In particular if you exploit a bug in a php web site (yes I'm talking ...
0
votes
1answer
8 views

Account Restrctions

i have tried this : ALL=/usr/bin, !/usr/bin/passwd, !/usr/bin/su but not success. is it possible user with sudoers permission cant able to change any password except his own user account ?
1
vote
1answer
32 views

Security of Ubuntu downloads

When I try to download Ubuntu Desktop and try to save, it shows different URLs. What is the difference between these different URLs. Which is the safest one? ( eg. releases.ubuntu.com ; ...
1
vote
1answer
27 views

Uninstalling Desktop sharing programs

Sine I want the most security as possible, I'm removing some programs that could give the access to remote desktop. In this case, I removed the Remmina Desktop Client (I think, if it comes with ...
0
votes
0answers
22 views

A question about logs (security)

I was taking a look on this page, about knowing if I'm being hacked, but I got a question. It says that: If large chunks of time (more than 5 minutes) are unaccounted for in a log file while the ...
1
vote
1answer
39 views

How to force SMB2 protocol in samba?

For security reasons, I'd like to disable the SMB1 protocol in samba. Is it possible? I'm running Ubuntu 14.04 LTS.
0
votes
0answers
20 views

Lock down Ubuntu Grub

I need to encrypt Grub boot loader with a password. Just for the sake of a friend not logging in sand trolling me. I have seen other instructions, but I just need Grub secured by a password, not an ...
25
votes
5answers
5k views

What's wrong with using sudo?

In a comment here I've been told that unnecessarily using sudo should be avoided. While it wasn't needed in that particular case, I don't see any harm in using it. I think that when executing trivial ...
0
votes
0answers
78 views

Problem using 'ecryptfs-unwrap-passphrase'

I have 2 laptops running Ubuntu 14.04. 1> The Toshiba supplies the mount passphrase when I run 'ecryptfs-unwrap-passphrase' 2> When I run 'ecryptfs-unwrap-passphrase' the HP does not supply ...
0
votes
1answer
19 views

Why am I getting this annoying log messages.CRON[17405]: (root) CMD every minute

I have configured rsyslog.conf file to store log messages to mysql but I am getting some annoying log message in my MySql table. which looks like this. Nov 3 14:48:01 username CRON[17405]: (root) ...
2
votes
3answers
113 views

How to verify Swap area functioning?

After increasing the Swap area and RAM size, the /dev/sda2 has become the Swap area and there is change in the UUID of swap. When the Ubuntu icon appears first after booting, a long line shows some ...
0
votes
1answer
60 views

A question about the last security update for Ubuntu [duplicate]

I'm subscribed to the Ubuntu Security Notes, so everytime that I receive an e-mail, a new update is avalable. But in the last update, they wrote something in the end that I coudn't undertand much, so ...
0
votes
0answers
20 views

Is it safe to disable apparmor profile?

In this anwser I've been told I can get rid of annoying error messages by disableing AppArmor profile for telepathy-mission-control-5. However, I suspect the profile is enabled by default for a ...
0
votes
1answer
45 views

Is there a way to encrypt the entire hard drive after you have already installed Ubuntu 14.04?

How would you go about encrypting your entire system drive after you already have installed Ubuntu? I have Ubuntu version 14.04 LTS and I am using a laptop so I would like to have my data encrypted.
0
votes
1answer
25 views

A question about installing security updates

I'm always following a website to know when security updates for Ubuntu are available. But, today, I saw this update (http://www.ubuntu.com/usn/usn-2388-1/), but the website told me to update the ...
0
votes
1answer
16 views

How to make non-ascii-armored public key from ascii-armored secret key

I have old key pair (GnuPG keys), both only ascii-armored 1 fresh Ubuntu-Desktop 14.04 installation How can I make a non-ascii armored public key from the old secret key?
0
votes
0answers
36 views

What is missing in my webserver ufw firewall configuration?

sudo ufw enable sudo ufw logging on sudo ufw allow proto tcp from any to any port 9999 sudo ufw allow proto udp from any to any port 9999 sudo ufw allow 80 sudo ufw app apache sudo ufw app OpenSSH ...
1
vote
1answer
57 views

How do I block all traffic except firefox?

Lets say for example I want to block all traffic except incoming from nginx, outgoing for firefox and allow out and incoming to some torrent client. Would that be possible? I took a look at apparmor ...
0
votes
0answers
89 views

nm-applet: No Certificate Authority certificate chosen

I have access to a wireless network that uses Protected EAP (PEAP), and requires a certificate. I don't have the certificate installed, and after I enter my password for the network it complains that ...
0
votes
1answer
168 views

Does ubuntu require antivirus [duplicate]

Does ubuntu require antivirus? If yes then please tell me what's the difference between windows virus and ubuntu virus?
0
votes
0answers
26 views

Checking of Residues of Windows

Years ago I had Windows OS in my System. But I now I am using Ubuntu only. I have 3 partitions in my Hard Disc Device Boot Start End Blocks Id System /dev/sda1 * ...
1
vote
0answers
41 views

How to disable mpm-itk for a specific virtualhost?

I've a main site on a server that needs to run a sudo command which I white listed via visudo. That worked fine until I installed apache-mpm-itk and then I started getting the following error: sudo: ...
0
votes
1answer
48 views

Modern Ubuntu home media, security, and automation center [closed]

I'm looking to set up a large computer to act as a home media center, a security system, and possibly home automation. I'd like the following features 64 bit support Modern (based on a recent ...
5
votes
2answers
89 views

What are the reasons to have strong password at home?

For a typical home PC the security situation is following: No servers running, not even the SSH. Firewall is ufw running in simple mode: all outgoing allowed, all incoming denied. Torrents and DC++ ...
0
votes
0answers
42 views

ConsoleKit history log file is suddenly huge

I've had a server running (accessible on the web) for a year or so. There's a series of compressed history files in /var/log/ConsoleKit that are a few kilobytes each. However. October's is 1.2 GB, ...