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

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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, ...
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1answer
115 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 ...
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1answer
54 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 keyboard,...
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2answers
24 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 ones)...
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1answer
69 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
211 views

Help I can't update clamav! [duplicate]

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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1answer
44 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
90 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 | i.imgsafe.org/...
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3answers
1k 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
54 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 ...
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1answer
51 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 ...
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1answer
42 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 ...
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2answers
53 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 ...
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1answer
56 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 ...
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1answer
40 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
630 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 ...
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3answers
4k 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 DENIED*?...
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1answer
54 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 ...
4
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1answer
1k 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
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1answer
734 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 ...
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0answers
67 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 ...
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2answers
85 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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2answers
541 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 ...
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1answer
56 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” ...
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0answers
257 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 ...
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0answers
43 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 ("...
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2answers
1k 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 ...
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4answers
164 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 ...
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2answers
51 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
135 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 ...
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1answer
962 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 ...
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2answers
117 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 ...
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2answers
184 views

Kernel live-patching in kernel 4?

According to Linux 4 release documentation, live-patching of kernel code is now possible in Linux 4. Does Ubuntu 15.10 Wily support these live in-RAM patches without rebooting? Do I need to do ...
4
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1answer
61 views

Why is ssh-agent running? Should it be?

Recently I've noticed a process called 'ssh-agent' running on my computer. It's only been there for a week or so, but it's never been there before. According to system monitor, the process running is '...
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0answers
27 views

Trouble creating/using snort rules in terminal

I have some troubles with getting Snort rules to run. I'm using snort 2.6.9. When I run Snort, the following error is given; Initializing rule chains... ERROR: /etc/snort/rules/(1) Unknown rule type ...
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2answers
46 views

remote accessing linux system

I would like to access my Linux system's command shell remotely. The system runs at home behind a router which connects it to the internet. I was thinking I could forward a port on the router to the ...
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0answers
201 views

OpenVPN, IPv6 and DNS Leaks in Ubuntu 14.04

I have been trying to set up a secure connection using OpenVPN but I've been running into some issues with DNS leaks. Basically, I have no problems getting the VPN service up and running using ...
4
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3answers
846 views

Safety of Dual Boot

I have a laptop that has both windows 7 and Ubuntu with a shared drive (so I a can share files between the operating systems). I use Windows 7 when I want to use a special program. I like to keep ...
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2answers
248 views

How to trace the IP of a Tox user?

I am a user of Tox, my client is qTox (if that makes any difference), and I was just reading their FAQs section when I came across these sections: How does Tox Protect My Privacy? Tox ...
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1answer
382 views

Is Ubuntu 15.10 safe for an Ubuntu beginner? [closed]

I have been using Windows for my entire life and I have recently wanted to move to Ubuntu. Unfortunately, I have Windows 8.1 installed and I don't want to uninstall it because I still want to use it ...
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0answers
178 views

recommendation for anti-keylogger software for linux

is there a recommendation for software or a method for anti-kelogger for linux something like KeyScrambler for windows
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1answer
141 views

keyboard input meathods (ibus?) crashed, and icons randomly rearranging

Well, I got another issue, and it's this: One day, a mysterious window randomly popped up after a while after login, and after doing some basic stuff and using Kazam, I rebooted, and my icons began ...
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1answer
65 views

Hamachi is able to ignore firewall

Hello I recently installed Hamachi and Haguichi. I created a network and my friend joined. So I hosted a game and the port was 1100, I think, but the problem is that he was able to join althrough I ...
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0answers
36 views

Protection against infected ISP

Today I faced a scary situation. I visited some websites and there was many ads popping up which warned me that something is wrong. I started my investigation and find out that some javascript files ...
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0answers
13 views

Ubuntu internal IP Proxy for security testing

I'm creating an public API, but it should only listen to certain IP's. Ofcourse localhost is one of them for development purposes, but I want to write unit / integration tests that should fail if the ...
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0answers
15 views

How to upgrade rkhunter from source files? [duplicate]

Due to the fact that the maintainers of rkhunter don't want to backport important security updates in for some reason, I will need to upgrade it myself. So I need to upgrade it to this version, but as ...
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0answers
16 views

I have accidentally uninstalled Apparmor

I have accidentally uninstalled apparmor, i don't know how to reinstall it. I have made ''sudo apt-get install apparmor'' But ''update-rc.d -f apparmor'' has not been installed, Why? Could ...
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1answer
136 views

Vulnerability in Apache 2.4.12 Wiley 5.10

Security scan revealed following vulnerabilities in fully patched and updated 5.10 Wiley distro: CVE-2015-0253 CVE-2015-0228 CVE-2015-3185 Apache Security confirm 2.4.12 is vulnerable here. ...