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

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Will Editing HOSTS file in Ubuntu Improve my Network Security?

I have recently learnt about 2 different ways of editing the hosts file in Ubuntu for the purpose of blocking webpages and domains tracking my computer (protecting myself from tracking cookies), and I ...
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15 views

What dangers have the Apt bugs security holes (USN-2348-1) caused?

Just recently 4 bugs in the Packet Manager Apt (the main in Ubuntu) has been discovered. Especially bad for 12.04 LTS as 4 security holes have been found there. My question is to what dangers have ...
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4answers
5k 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 ...
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2answers
50 views

What's the status of encfs?

Is the encfs project no longer maintained? It seems the last update 1.7.4 was released on November 18 2010. In a security audit several weaknesses have been identified, but no updates have since been ...
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How to avoid chrome store password in seahorse?

I am very concerned about the unencrypted passwords saved by chrome in seahorse. This equipment is shared and used by several people, so any user with the root password can change my user password ...
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19 views

Which security and antivirus programs do you recommend?

As the question leads, is there A program that verifies secure settings are on for Linux, and/or if there are signals of security problems? Is there a solid anti-virus that can perform one-time ...
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2answers
30k views

How to create a restricted SSH user for port forwarding?

ændrük suggested a reverse connection for getting an easy SSH connection with someone else (for remote help). For that to work, an additional user is needed to accept the connection. This user needs ...
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1answer
25 views

how to verify that sbin/init isn't infected?

for sometime chkrootkit has been showing sbin/init as being infected with SuckIt rootkit. early this year when the warning first appeared a quick google search indicated that it was most likely a ...
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10answers
25k 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 does to secure their ...
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2answers
86 views

How to access locked hard drive?

I have a hard drive with an old 12.04 server install and a data partition on it. I have the hard drive hooked up to my current desktop using a usb to sata adapter with external power supply. I am on ...
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19 views

How do I report an Ubuntu Software Center “Listing” problem?

How do you report a possible security risk to users in Ubuntu Software Center? There is two game apps in the Ubuntu Software Center called "Karts" and "Kart 1000..." Both: - Listed as free - But the ...
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Setup Webgoat on ubuntu 14.04 with lamp server

Can any one give me the breif instructions for how to install Webgoat on Ubuntu 14.04 (not a server) step wise I am facing problem with setting java_home variable to java 1.5 jdk
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Ubuntu 14.04 installation permission denied from HDD & external HDD

Title is self explanatory sadly; had no luck after getting past the security (for now) and the same from my Samsung external HDD Desperate trying to get this to work but no luck except on a virtual ...
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What kind of access flash has to our systems?

It seems like there is major security issue found in flash every other week or so. There was another one just yesterday. This and being closed source, I can't help but wonder, what kind of access it ...
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7answers
8k views

Access Prompt keeps asking for GMail password

A pop up keeping appearing in Ubuntu (running 12.10), asking for the password to my gmail account. The icon has a silver shield, and it is labeled Access Prompt. The actual window has an image of ...
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19 views

Allow one process access to /dev/uninput without completely compromising security

Steam In-Home-Streaming was turned back on the other day. This allows you to play games being rendered on one computer on another computer (commonly playing games on a TV/Media Centre that are being ...
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can the webcam be restricted by a password?

Is it possible to to make using the webcam by applications restricted to the root? i mean like how one can change permissions for files using chmod. Or how you are asked for the password every time ...
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Questions about how malwares might operate under wine [duplicate]

a recent scan by clamav found that a few exe files in the WINE directory are infected with a trojan (called Ratnim?). A have a few specific questions on what a windows malware can do under linux. 1) ...
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2answers
45k views

How do I keep track of failed SSH log-in attempts?

I'd like to see if somebody has been trying to log-in by brute-force into my Ubuntu 12.04 server over SSH. How can I see if such activities have been taking place?
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Blocking HTTP requests without Host header using mod_security2

In my Apache configuration, I want to allow only Host header based vhosts. That is, I'd like to block any traffic by IP address only. I have mod_security2 installed, but I am only using the default ...
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1answer
26 views

Allow www-data to create directories

How would I, with security in mind, allow www-data to create directories within /var/www/html/assets/img and its sub-directories? I have a PHP script that automatically creates directories with 777 ...
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0answers
16 views

Ubuntu servers protection

Here is my needs : i need to protect data from being stolen on servers and Those servers are not physically secured. First i just wanted to base security solution on root password protection but ...
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1answer
59 views

PHP script unable to create directory with 777 permissions

I have a script that automatically creates a directory if it doesn't exist and sets permissions to 777. The problem is, it's only setting permissions to 755: if ...
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1answer
21 views

make services request permission to open ports?

Is there a way to make services request permission to open ports? Basically to start up with all ports closed, as root so services will have to request permission to open them?, and you can decide to ...
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1answer
43 views

OpenSSH: hacked before set up?

Today I tried setting up OpenSSH on my computer with the hope of being able to connect to it from a different computer at work. This was my first time attempting to use open-ssh. I did the following ...
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0answers
25 views

RomPager HTTP server is affected by a cross-site scripting vulnerability

After auditing my ubuntu 14.04 machine with Nessus scanner I received the following message: RomPager HTTP Referer Header XSS Description The remote RomPager HTTP server is affected by a ...
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4answers
228 views

Using NX Server Securely?

Recently, I built a computer running Ubuntu and gave it away to a relative. I'm willing to give them IT support for free, but they live 50 miles away. The Solution? A NX Server. I setup the Node, ...
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327 views

What security context software does Ubuntu use?

Does Ubuntu use SELinux by default and if not, how is security context managed? For example, allowing processes to run as root without security context can be a security risk. The help page about ...
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2answers
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Is this a security risk/concern?

According to: http://wiki.secondlife.com/wiki/Linux_Viewer#Installing_and_Running The Second Life Linux client entirely runs out of the directory you have unpacked it into - no installation step ...
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29 views

Nessus SNMP security warning

I ran a Nessus scan on my Ubuntu 14.04 machine. I received the following: High: SNMP Agent Default Community Name (public) Description: It is possible to obtain the default community name of the ...
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1answer
169 views

Anyway to use Skype in AppArmor?

Ubuntu 14.04 and Skype 4.2 installed. I've set up AppArmor using the Skype AppArmor profile from this wiki. When I use AppArmor with Skype, it has no audio. Is anyone using AppArmor successfully with ...
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problems gaining root access and installing software due to authentication. [duplicate]

I have a laptop that had ubuntu installed, however though many ownerships, the pass word is lost, anyway of removing this absolute shite of an install block. every time I try to do something it asks ...
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1answer
77 views

Connect to my College's WPA from Ubuntu 14.04 LTS [duplicate]

I have Ubuntu 14.04 LTS, and am running it on a Sony Vaio VGN-CR12OE. It is the only operating system. I am trying to connect to my college's WPA WiFi. My settings for this WiFi connection are as ...
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114 views

What do LISTEN and ports mean in netstat? [closed]

I have been monitoring my system lately and I have found some strange things are running on my system. Can anyone please explain what they are and why same program use several processes? Output of ...
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60 views

Do logins by the gdm (or lightdm) user in auth.log mean my system is breached?

Please look at this auth.log (from Ubuntu 14.04) I have provided and tell me who this gdm user is and why there are all these unauthenticated logins? I am freaked out; please help! Here's the ...
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4answers
3k views

Is it risky to download a script with a http://goo.gl/ link?

Following the advise of an answer in Ask Ubuntu, I downloaded and ran a script with a URL starting by http://goo.gl/ Is it risky to use such file? could it be a virus or something else? If yes, what ...
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1answer
39 views

How to prevent data from being written into a directory?

Or: How to make a directory write protected, for all users until unlocked again?
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1answer
22 views

How do you detect file changes

Since Linux is vulnerable to a number of similar vulnerabilities as windows. I'm trying to find a daemon that catalogs and alerts me/user of any and all file changes as well as file additions. Is ...
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2answers
36 views

What lines should be commented out in my sources.list file?

I have just updated from Ubuntu 12.04 to 14.04 last weekend. I haven't downloaded any extra programs as of yet. I checked my sources.list file and it has the following lines in it: deb ...
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11 views

Locking all setting

Is there a way to lock all the system setting on ubuntu so people cant change them without permission? example removing printers. I am taking care of a schools computer room and teachers/students are ...
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36 views

How can I lock Seahorse GnuPG Keys?

since not long ago I've started to use seahorse to manage my encryption keys, and at the moment I'm finding myself a bit baffled about what it appears quite a security hole of the system... In fact, ...
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1answer
22 views

is denyhost central database stored locally?

I was tasked to write a security policy to apply to any ubuntu server we deploy at a client's site. Knowing how some of the corporate are restrictive on what resource is available to what box on their ...
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0answers
11 views

Prevent Network Injection

I read this article: http://gizmodo.com/pro-hackers-could-be-spying-on-you-through-youtube-1622367382 I'm running Ubuntu 14.04. How can I prevent network injection of my internet browsing traffic? ...
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4answers
4k views

Autoexec.bat equivalents for Ubuntu that run with root privelidges?

On Ubuntu there must be several "autoexec.bat" equivalents as I can see files like rc.local which seem to do very little because the comments in the file says it doesn't work by default and I tried ...
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2answers
62 views

What should I do to avoid my roommate from changing my password through using system recovery mode .?

He did this last time when I left my laptop at room. Opened the system recovery mode from advanced Ubuntu options and changed the password using 'passwd usrname ' command.Is there anything I can do ...
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2answers
32 views

Don't remember PGP passphrase until end of session [duplicate]

To use my PGP key I always have to enter my passphrase. But as it happens, I have to unlock the key only once for every session. The desired behaviour would be, that I have to unlock the key each time ...
0
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1answer
42 views

Are there really security risk when running Wine? [duplicate]

I remember reading somewhere that since Wine's job is to pretty much emulate Windows so that you can run Windows programs, it puts a risk on your Linux machine since Windows Viruses can also run ...
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1answer
40 views

I have some questions about Firewall [closed]

So I am pretty new to Linux (With the exception of Android), and being use to the old ways of Windows pretty much all I had to do for Firewall was turn it on and forget about it. However with Ubuntu ...
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1answer
2k views

Fingerprint reader driver for Validity Sensors Fingerprint scanner

prakhar@pr3d4tOr:~$ lsusb -s 001:003 -v Bus 001 Device 003: ID 138a:0018 Validity Sensors, Inc. Fingerprint scanner Couldn't open device, some information will be missing Device Descriptor: bLength ...
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2answers
60 views

wget security.ubuntu.com not working on ubuntu

We are able to use wget for other URLs, such as google.com, but wget security.ubuntu.com not working and giving output: Resolving security.ubuntu.com (security.ubuntu.com)... 91.189.92.200, ...