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

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19 views

encfs reset settings to standard

I do not correctly identify the customizations when it first installs. Encrypted data is now not displayed. How to reset the settings to standard?
15
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2answers
683 views

How can I further secure my system using 2 factor authentication?

The title pretty much says it. I have been hearing more about 2 factor authentication, one-time passwords, hard-tokens, and other improved security features. With the decreasing security of using just ...
0
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4answers
57 views

What is the reasoning behind hiding characters when entering the sudo password?

When entering the sudo password, the • characters are hidden. Apparently the • are omitted for better security. They seem secure enough to me, and I don't see why they're not used. I think I'm ...
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2answers
62 views

Is firefox safe to use on Ubuntu/Linux? [closed]

While using Firefox on Ubuntu, I frequently run into warnings from various sites (recent examples: when checking gmail, www.hitrecord.org), that inform me that I am using an outdated/unsupported ...
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0answers
36 views

UFW ACCEPT Problem

I'm having problem with UFW. If i block like whole /24 network becouse lots of bruteforcing etc. coming from China / Korea or somewhere. They still get to open ports. If i have, lets say port 443 ...
-1
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1answer
40 views

Of what help is SE linux to me?

i am new to Linux. I have heard about SE linux ... how does it work with Ubuntu and what can i do with it?
14
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3answers
1k views

Unsupported Ubuntus - is it safe to continue with them?

I'll try to be as clear as I can about this, hoping to get clear answers. I have Ubuntu Studio 15.10, which is not an LTS version, and will only be supported till July 2016. Does that mean there ...
1
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2answers
96 views

Auto unlock keyring on auto login without leaving password unencrypted

So I keep getting this unlock keyring popup when I login to Ubuntu automatically. There is a fix here: How can I stop being prompted to unlock the 'default' keyring on boot? I have been googling ...
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1answer
48 views

Remove string “please enter passpharase for disk…”

I traveled to Australia it seems they didn't like my face or I looked suspicious since they made me turn on my laptop and when ubuntu encryption password popped up they asked me for it, nothing to ...
2
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0answers
19 views

How to only allow a file to be opened or executed by certain application(s)?

Let's say that I've got a security application (or something which I just don't want any old application or user to have access to because it is very important and if the wrong guys had access to it ...
0
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1answer
58 views

Automatic kernel security updates no long being installed

A while back my /boot partition filled up on my Ubuntu server 14.04 install. This caused an automatic kernel security update to fail and be in a partially installed state. To fix the problem I removed ...
16
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2answers
4k views

New Zero-day exploit reportedly found affecting Linux/Android (CVE-2016-0728)

Russia Today reports (20 January 2016) that there is a new zero-day exploit that has been discovered affecting Linux and all Linux-based OSes for computers and phones. What is the deal; how does it ...
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0answers
8 views

cureent Kerberos password specifications

Current kerberos password, there must a certain number of used charecters or length...I keep getting, that doesn't work please try again from my welcome screen, does anyone know the specifications?
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1answer
47 views

Secure browsing

I would like to hear from you suggestions, how to improve security during browsing. Let's say that I am going to use Chromium. With this extensions: Web of Thrust (to be noticed, if i visit bad ...
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0answers
29 views

NTP question on ntpdc -c peers

I just started learning networking. I recently installed ntp on Ubuntu 14.04 running in Virtualbox on OS X. I was just trying to understand how it works. so when I executed ntpdc -c peers command in ...
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0answers
19 views

Everything in syslog has been removed! Security risk?

I am new to Ubuntu. I've only been using it for a few weeks. I was wondering; does Ubuntu delete the logs after a while? My syslog was full of logged events this morning, but when I checked it now, ...
1
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1answer
98 views

Linux overwriting RAM with zeroes on free()

I was just wondering if it is possible to tell Linux/Ubuntu to overwrite freed memory with zeroes before letting the next application allocate it? If not, why isn't this possible? I know that ...
0
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1answer
52 views

Ubuntu : Disable access to file-manager, keyboard,mouse(Touch screen available) for guest account

I am looking to configure Ubuntu(Any version, new installation) for presentation in which I would like to do the following things : Automatic guest-login at startup. Completely disable ...
0
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2answers
19 views

Are ssh keys generated individually by Ubuntu Server LTS 14.04 setup?

Let's assume freshly installed and updated&upgraded Ubuntu Server 14.04 LTS with ssh server. Does installation scripts generate new ssh keys for each installation (so I am safe having unique ...
0
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1answer
57 views

What to do about a false positive in clamtk

I am getting a message from clamtk antivirus after running a scan on the download folder the result said 10 viruses found how can 10 viruses be found if nothing in the download folder but some files ...
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3answers
144 views

Help I can't update clamav!

I was updating the clamav antivirus defenitons with the sudo freshclam command and the output was ERROR: /var/log/clamav/freshclam.log is locked by another process ERROR: Problem with internal ...
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2answers
145 views

What are the alternative to clamtk

I installed the antivirus clamtk/clamav, the installion went well, but I can't run the program. I tried a terminal, but that did not work. The result was if I typed sudo clamtk nothing happen, but if ...
0
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1answer
42 views

How to know that my ubuntu system is clear from bad file? [closed]

How to know that my system have been accessed through by backdoor and how to know there is rootkit, malware or trojan in my ubuntu system.
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1answer
86 views

Redirection to ad pages in browsers

I have a serious problem when visiting web pages, with anything in any moment, as you can see in the screenshots. photo1 - ubuntu-es | photo 2 - ask ubuntu | i.imgsafe.org/373b693.png | ...
18
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3answers
964 views

How can I force sudo to always ask for a password after waking from suspend?

Say I execute a command with sudo, then if I use sudo within the next 15/5 minutes (not sure how long it remembers me for) it won't prompt me for a password. It will only prompt me again if I haven't ...
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2answers
39 views

Run service with previledges of another user?

I want to host a CouchDB but heard that it might be wise not to run it as a root but create an own user for that with little privileges as possible. How can I achieve that? When I just install ...
1
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1answer
44 views

Protect Ubuntu system from MSFvenom attacks

I have been reading about MSFvenom and its usage as a tool to attack devices connected to a common network (for example, see here and here). Kali is a well-known Linux distribution that implements ...
3
votes
1answer
38 views

Any CA Cert trusted by default on ubuntu?

I understand I can copy the CA cert to certain location and run script update-ca-certificate to import CA cert to the system. But I'm curious is there a list of CAs that are trusted by default on ...
0
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2answers
44 views

Why does Ubuntu comes with two firewalls by default?

I just realised Ubuntu comes with two firewalls by default iptables and ufw. But why? I mean running more than one software firewall on one computer can be insecure, that's what they say. I don't ...
5
votes
1answer
43 views

How to make a computer running on runlevel 3 ask for password when waking up from suspend in X?

I have recently set runlevel 3 as a kernel parameter instead of runlevel 5, though this has caused a little bit of a problem... Because when I execute startx and then once the GUI has loaded, if I ...
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0answers
27 views

Secure Mode Ubuntu 15.04 [duplicate]

I'm running 15.04 ("live version" from an external SSD on a Mac Pro). When Ubuntu boots, I get a warning that it's in "insecure mode." What does this mean?
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0answers
17 views

How to insert digital signature in LibreOffice documents [duplicate]

I was trying to insert digital signature in LibreOffice writer documents. I went to file section then to digital signature. After that, I couldn't insert my sign because the option was blank. How to ...
0
votes
1answer
38 views

Problem with determining “security updates”

My test machine is running Ubuntu 14.04.1. /usr/lib/update-notifier/apt-check --human-readable says that 157 packages can be updated and 81 are security updates. apt-get -s dist-upgrade | grep ...
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2answers
622 views

Is Ubuntu vulnerable to a Grub2 authentication bug?

Does this security bug affect Ubuntu? It involves pressing backspace 28 times to break into a machine. From Lifehacker: The researchers, Hector Marco and Ismael Ripoll from the Cybersecurity ...
6
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3answers
2k views

How to fix Secure Boot error “Image failed to verify with *ACCESS DENIED*” on startup?

When I started up my machine this morning (I have Secure Boot and UEFI only enabled) I got this error (sorry for low quality image): What does it mean by Image failed to verify with *ACCESS ...
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1answer
53 views

Which is the most secure way to connect to the office network from outside? [closed]

For working remotely, I am looking for the most secure way of logging-in to office network from outside. Being a data center, the minute chance of vulnerability issues cannot accepted. Is open VPN ...
5
votes
1answer
892 views

Chkrootkit says “Searching for Linux/Ebury - Operation Windigo ssh… Possible Linux/Ebury - Operation Windigo installetd”, should I be worried?

I recently ran sudo chkrootkit and this was one of the results: Searching for Linux/Ebury - Operation Windigo ssh... Possible Linux/Ebury - Operation Windigo installetd In my research on ...
3
votes
1answer
578 views

ClamTK Anti Virus will not run on Ubuntu 15.10

I have a laptop running Ubuntu 15.10. To protect myself, I have tried downloading and installing ClamTK. It does this without giving any error messages but it doesn't open. I tried on a second ...
3
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0answers
65 views

Is Hardenubuntu.com legit? [closed]

Hey all So I was looking around for methods of hardening ubuntu server and came across hardenubuntu.com. I was wondering if you the community could tell me if the advice in this site seems legit and ...
2
votes
2answers
77 views

clean install, but with boot loader installed onto USB drive

I'm starting a new job that requires full drive encryption for me to use my own computer. My new job will require telecommuting so I have to try to meet my new bosses security or I have to learn ...
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votes
2answers
376 views

I visited a hacked website! Should I be worried? What should I do now?

I am concerned about the security when I run Ubuntu without an anti-virus and visit a hacked website. I feel that this question then should be asked here and not anywhere else. I can't seem to ...
0
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1answer
47 views

What is the difference between transactional updates in Snappy and the normal Ubuntu updates?

https://developer.ubuntu.com/en/snappy/ The snappy approach is faster, more reliable, and lets us provide stronger security guarantees for apps and users — that’s why we call them “snappy” ...
4
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0answers
195 views

OpenJDK, IcedTea security settings

I am a beginner Linux user. From my knowledge the system uses OpenJDK and IcedTea only when I connect to a SAP IDES server through SAP GUI JAVA adding a string in it to connect to that server. I use ...
0
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0answers
36 views

sata,usb, ps/2 packets sniffer wanted

TL;DR. I've had a hardware virus on my Windows systems on my network. I've brought a clean computer, installed Ubuntu and plugged in infected HDD and usb keyboard. Computer refused to boot ...
1
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2answers
832 views

Can Ransomware effect the Linux OS? [closed]

Recently, The Hacker News stated the following: Ransomware threat has emerged as one of the biggest threats to internet users in recent times. Typically, a Ransomware malware encrypts all files on ...
0
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4answers
126 views

Production-ready, hardened edition of Ubuntu Server?

By default, Ubuntu Server is not very secure: Automatic security updates are not enabled The 'ufw' firewall is not enabled SSH key-based logins have to be explicitly created and so on... For my ...
0
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2answers
49 views

Is there any need of antivirous program such as microsoft windows? [duplicate]

Microsoft windows needs an anti virus program to protect system from virus and other programs which are harmful for the system. Is there any need of such type program for Ubuntu OS? If not then why?
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1answer
97 views

How to confine WINE apps using a chroot jail?

I have read the SecuringWine page on WINE official website, and one of the things it says you can do to increase security is: One can run wine inside a chroot jail. So what exactly is a "chroot ...
7
votes
1answer
860 views

Will a Virus or Malware inside a User Account or Guest Account Affect the Entire Ubuntu System?

When I started out with Linux, and while studying the file structure and access permissions of Linux systems, a thought formulated in my mind, that as long as you operate only within your less ...
0
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2answers
81 views

Passing encrypted password in mount command

I am trying to cron a simple 4 line bash script to backup a folder which requires me to mount the NAS folder for which I have to provide the password. Which is a big NO , Is there a way to pass the ...