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

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Guidance concerning Comprehensive SSH Secure Server setup [on hold]

Alright, I am essentially seeking to obtain a few good leads concerning which sources to capitalize on concerning setting up a Secure SSH Ubuntu server. This would be my first serious build (without a ...
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22 views

Create x11vnc password file with both admin and viewonly password on 12.0.4LTS

Using Ubuntu 12.0.4 LTS and need to enable x11vnc access with admin and viewonly access based on which vnc password is supplied. The x11vnc server gets started out of /etc/lightdm/start via: ...
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1answer
25 views

Kernel security settings

What is the right security setting for the net.ipv4.conf.all.secure_redirects option in sysctl.conf? Here it sets to 1 and Here sets to 0. Is net.ipv4.conf.default.secure_redirects related to ...
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8 views

Juju security model issues

What plans are there to extend the security model in Juju? We see two significant issues with the current model - no internal firewalling within an environment, and the inability to expose ports to ...
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0answers
24 views

Ubuntu Repository Security [duplicate]

I notice that Ubuntu repositories is not HTTPS, all links in /etc/apt/source.list in http links. This is a peace of my repository links: deb http://archive.ubuntu.com/ubuntu saucy main restricted ...
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1answer
18 views

Can I secure a webpage with something other than username/password

I want to secure a webpage, but I want something better than username and password. Is there any public key style authentication for a webpage? I'm not concerned with the usability / convenience of a ...
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1answer
12 views

LOIC to work in ubuntu

i have been wondering on using LOIC(Low Orbit Ion Cannon) in ubuntu,but the problem is will it work in ubuntu 13.10 because LOIC is developed in .Net. how to get LOIC working in ubuntu?
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1answer
16 views

Remove SUID/GUID bits

SUID and SGID files on system are a potential security risk, and should be monitored closely. Is there any file in ubuntu server that recommended to remove SUID/GUID bits from it?
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1answer
53 views

basic security tools and packages that should be installed on a public facing web server

I'm a newbie in this world and I do not have a lot of knowledge about how security works on Linux systems. I recently created a droplet on DigitalOcean with Ubuntu 13 and I've been setting it up by ...
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2answers
38 views

Security Objectives [closed]

New to Linux New to Ubuntu Objective: Better understanding security Ubuntu 12.04 LTS Hello, I am going through the security guide on Ubuntu documentation, and I am getting demotivated fast. I ...
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129 views

What does the Heartbleed bug mean for Ubuntu? Is Ubuntu not as secure as I thought? [duplicate]

I hope this question isn't closed for being subjective because I think there is a correct answer somewhere, even if it's a wiki-style explanation answer. One reason for using open source software for ...
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0answers
25 views

SELlinux security domains

I am studying SELinux, but I can't find any clear definition for security domains. What is a security domain and what is its difference with security context?
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1answer
80 views

Ubuntu security: “antivirus” in official statement?

I use current (and vanilla) Ubuntu in a work environment. (It is, in the main, a Windows-orientated outfit.) A question has come up about antivirus, and I see this on the official Ubuntu website: ...
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How to auto restart services when you get security updates?

That's related to the heartbleed bug. While my server (12.04 LTS) was configured to perform unattended install of all security updates, it seems that nginx was not restarted so it was still affected ...
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2answers
9k views

Patch OpenSSL CVE-2014-0160 on ubuntu 12.04?

NO, this is not a duplicate of How to patch the Heartbleed bug (CVE-2014-0160) in OpenSSL?. So, read on. I am seeing conflicting information with respect to Ubuntu 12.04: The Heartbleed page claims ...
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1answer
2k views

Problem updating OpenSSL in 13.10 - How to diagnose or work around?

Following the instructions in the existing question on the OpenSSL bugs, I've run apt-get update and upgrade, and rebooted. Now when I check the version, I do not have the version mentioned in the ...
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1answer
42 views

Are pre-releases not getting security updates? [closed]

I got a new computer a couple of weeks before the expected Trusty release date, so to save my the trouble of first installing Precise and then upgrading, I installed Trusty Final Beta. Now I see that ...
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81 views

12.04.4 server can't verify common SSL certificates, usual fixes failing

The Problem I've got one server in a farm which is suddenly unable to correctly handle SSL certificates. Attempting to do a curl command like curl -v https://google.com results in: curl -v ...
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6answers
74k views

How to patch the Heartbleed bug (CVE-2014-0160) in OpenSSL?

As of today, a bug in OpenSSL has been found affecting versions 1.0.1 through 1.0.1f (inclusive) and 1.0.2-beta. Since Ubuntu 12.04, we are all vulnerable to this bug. In order to patch this ...
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0answers
50 views

Security Antivirus [duplicate]

brand new to ubuntu...I know there is way less virus problems then windows, however, is the security within the OS enough or do you suggest Antivirus program also (this is assuming the individual is ...
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1answer
50 views

Ubuntu 12.04.4 x64 - How to disable SSH daemon

I've read in this thread that running the SSH daemon with root privileges enabled by default is a potential path for malware infections: How to deal with malware on my laptop? How can I check ...
2
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1answer
25 views

Security benefits to force users to change their password at first login

When I consider chage command, I found that I can force users to change their password at first login with following command: $ sudo chage -d 0 <user-account> Has this work any security ...
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0answers
14 views

New user only RWX one directory

So, I read this: Is it possible to create users that can only use one directory? I would like to make it where my newly created user "kevin" (to keep in theme with the referenced post) cannot RWX in ...
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2answers
30 views

Reusing old passwords

pam_cracklib module is capable of consulting a user's password "history" and not allowing them to reuse old passwords. What security risk is in reusing old passwords? If this work is useful, how many ...
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2answers
34 views

unnecessary accounts in ubuntu

It is recommended in hardening process that remove unnecessary accounts. What security problem exist with unnecessary user account? Are there recommended user accounts that should be removed?
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1answer
331 views

How to deal with malware on my laptop?

I am fairly certain that my Ubuntu 13.10 laptop is infected with some sort of malware. Every once in a while, I find a process /lib/sshd (owned by root) running and consuming lots of cpu. It is not ...
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full disk asymmetric encryption

Wondering if there's a protocol and open source program for full-disk, asymmetric encryption. Something like, encrypting the keys into the start of the disk (using AES/something stronger) and then ...
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1answer
128 views

Is having Lubuntu 12.04 a security risk?

I have a computer with Lubuntu 12.04 installed. Since unlike Ubuntu 12.04 Lubuntu is not LTS, I will not get Lubuntu updates. However, I am still getting updates (I guess these are the general Ubuntu ...
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1answer
15 views

Encrypted Lock Screens?

I really like the disk encryption to secure my funds, but my problem is I practically never have my computer off. I live a very busy life and shutting it down totally every night is entirely ...
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0answers
11 views

I've lost my secuity password [duplicate]

I've lost the main password to my computer and can only boot from C.D how do I reset it to access my computer from itself?
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0answers
12 views

What auditing information is available for Universe repository software packages?

I understand that the "Masters of the Universe" (MOTUs) are responsible for packaging and reviewing/checking software that goes into the Universe repository, but there seems to be no formal process ...
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0answers
19 views

Read CPU serial, boot kernel only on match

I have been advised to come to you here. I'd like to bind a kernel to a specific CPU's serial number on a Raspberry Pi. The serial number is available at runtime to userland through /proc/cpuinfo and ...
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1answer
127 views

linux command to prevent dos attack by using netstat and iptables

I want to DROP more than 200 requests per ip to prevent ddos attack. this is command that i used to detect requests count per ip : netstat -alpn | grep :80 | awk '{print $5}' |awk -F: '{print ...
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3answers
229 views

Should Ubuntu users be concerned about “Operation Windigo”?

Should desktop users of Ubuntu (and other Linux distros) be concerned about the malware-infection drive described as "Operation Windigo"? What threat does it pose to us immediately and are there any ...
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1answer
33 views

How to launch program on lock and close it on unlock [duplicate]

Have siblings who like to "play" with my laptop by waking it from suspension and then typing random keys on the keyboard into the password field. Afterwards, they always deny it. I plan to install ...
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0answers
83 views

Why has Ubuntu One Music Store not renewed its security certificate? [closed]

I have been trying to download music from the Music Store but Firefox tells me the security certificate expired two days ago so it won't let me. Is this something they might not realise, i.e., do ...
2
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1answer
45 views

What are the possible threats if internal IP address is publicly revealed?

In many cases, people do not take enough care to remove their IP addresses from some output before posting it to help forums and Q&A sites like askubuntu. Considering one's IP address is revealed ...
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1answer
48 views

How To Install Djigzo on Ubuntu?

Can any one provide step by step configuration to install Djigzo? Djigzo Website.
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1answer
36 views

Disable logon prompt show hostname

Per default the login prompt shows %hostname% login:. I don't want anybody with console access to see the hostname of the server that easily. How to get rid of the hostname there?
2
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1answer
49 views

Prevent www-data from running scripts and programs

I discovered this little PHP script that allows you to enter GET requests manually from the browser address bar and execute commands. I played around with it and discovered that I could do all kinds ...
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0answers
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Hide “Places” or “Username” in File Chooser Dialog

Background Making a video-capture of a website demo; part of the demo requires uploading files. Problem The username is displayed in the video, which is a security concern. Question How do you ...
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1answer
18 views

how to encapsulate HTTP in a HTTPS session

Team, hi, I'm looking for a solution that would allow me encapsulate incoming HTTP traffic, with HTTPS traffic from my application (HTTP in an iFrame), and deliver both as HTTPS. Can Squid proxy do ...
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0answers
16 views

In sysctl.conf settings, what is the difference between 'all' & 'default'?

In context of sysctl.conf settings, what is the difference between (all vs. default) like net.ipv4.conf.all.accept_source_route & net.ipv4.conf.default.accept_source_route in sysctl settings ? ...
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2answers
656 views

Package denyhosts in Ubuntu Trusty Tahr is deleted: temporary or forever?

While doing a test-upgrade of our Ubuntu server to 14.04, I found that the package DenyHosts is no longer available. Installing it gives following error: apt-get install denyhosts Reading package ...
5
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1answer
92 views

Rootkit on port 60001 !? Tiger says so - how do I verify? [closed]

My system is an up-to-date Ubuntu 13.10 I've installed Tiger and I'm getting this # Running chkrootkit (/usr/sbin/chkrootkit) to perform further checks... OLD: --ALERT-- [rootkit005a] Chkrootkit has ...
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1answer
113 views

Do modifications to sysctl.conf take effect in openVZ container?

I'm following a security guide(http://www.thefanclub.co.za/how-to/how-secure-ubuntu-1204-lts-server-part-1-basics) to strengthen my OpenVZ based VPS webserver running Ubuntu 12.04 , a part of that ...
0
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1answer
44 views

gksudo from a non sudoer?

I want to run gui applications that require admin privileges from gksudo/gksu on a non-sudoer account. Currently, I can just run sudo guiapplication from a sudoer tty, and will be able to display/use ...
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1answer
206 views

Is there a NSA backdoor in ubuntu desktop os? [closed]

I heard talk of selinux being in ubuntu and it being a nsa backdoor. Source of my worrying :( So are these guys right? Is there a backdoor in Ubuntu (I use xubuntu if that matters)? Have any of you ...
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50 views

Analyze firewall logs to track intrusion

I have just started this topic where the firewall on my router detects intrusions e.g. Mar 11 14:15:11 kernel warning kernel: [fwlog] Intrusion -> SRC=85.102.133.241 DST=109.78.126.234 ...
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3answers
78 views

Encrypted files on a server [closed]

There is a way of encrypting the data files stored on the server to harden them against direct access or hacking. The website is in /var/www as usual and uses PHP to access data on another drive ...