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

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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 ...
0
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1answer
45 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 ...
2
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1answer
362 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 ...
130
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6answers
91k 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
101 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 ...
0
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1answer
90 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
38 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
17 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
48 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
42 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?
12
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1answer
465 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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0answers
28 views

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 ...
4
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1answer
294 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 ...
2
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1answer
39 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
13 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
14 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
23 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 ...
2
votes
1answer
816 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 ...
3
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3answers
309 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 ...
3
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1answer
48 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
97 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
78 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 ...
0
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1answer
101 views

How To Install Djigzo on Ubuntu?

Can any one provide step by step configuration to install Djigzo? Djigzo Website.
3
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1answer
57 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
76 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
46 views

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 ...
1
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1answer
26 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
24 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 ? ...
15
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3answers
3k 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
votes
1answer
116 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 ...
0
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1answer
339 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
62 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
738 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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0answers
67 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
81 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 ...
4
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2answers
99 views

How to prevent users from deleting files that are already in use?

Consider this scenario: User is executing a command on a file. This file becomes 'in-use' now. $ tail -f somefile.log In another shell, user deletes the file. $ rm somefile.log Now, this file ...
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0answers
12 views

Camera Monitor keeps triggering

Just installed Firefox into WINE and now webcam-monitor keeps saying something is accessing my webcam. What's going on?
2
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1answer
56 views

Are any Ubuntu (Linux) vulnerabilities in media applications?

Ubuntu (Linux) has a solid system that permits and requires root privileges to modify the system. However; if an installed application eg. VLC, audacious, some image viewer installed from the ...
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0answers
7 views

Matching vulnerabilities with upstream versions

How am I supposed to match vulnerabilities with services fingerprint with ubuntu (and debian) upstream's version? Is there a public database to match these versions with original versions? ...
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0answers
9 views

What prevents a user process from writing at random positions in memory and damage the OS or other processes?

Why can't the following code damage memory? int x; while(1) { x = rand();//assuming that the address space has the size of an int *x = 0; } I know that each process has a virtual address ...
0
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1answer
69 views

ubuntu 13.10 - not prompted for login at start up

Mostly - oddly not every time - when I reboot, or start up my laptop, I am not prompted for a password; it goes straight into my desktop. I don't like this one bit. There are other users on my laptop, ...
0
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0answers
101 views

Should I install Apache & PHP separately OR uninstall MySQL from a LAMP stack?

I'm developing a site for my customers to view their account transaction history, with the ability to make payments through a hosted pay-page. Our legacy system requires keeping our database ...
0
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0answers
16 views

How to save kftpgrabber site in kwallet

I'm researching for a more secure FTP client which is more securelely stores site details like passwords, than Filezilla and found kftpgrabber fits with my need. However for get the most out from ...
19
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3answers
1k views

What is the “Free software only” option when installing Ubuntu?

When installing Ubuntu, you get a Free software only option. Does that Free software only option mean Free as in beer or Free as in freedom? When I say free as in freedom, I mean FSF type of ...
0
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2answers
46 views

Is the latest provided php5 package in an LTS distribution secure?

I need to update php5 on a 12.04 LTS production server. The latest candidate provided is 5.3.10-1ubuntu3.9. Is that version patched to be secure for use in a production environment? PHP is up to ...
1
vote
1answer
31 views

how to limit resources to a shared ubuntu 10.04

The title might not be explanatory enough but I couldn't find any better way to formulate it. I will be running a server for office use. It will host applications on tomcat. 2 differents people would ...
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0answers
55 views

Is it safe to run Samba on a wireless network?

I have Samba server set up on my laptop so that I can share and sync files between the laptop and my Android device through a WPA-secured wireless hotspot (which is provided by laptops wireless card). ...
1
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1answer
287 views

Man in the Middle Attack warning with OpenVPN

When using openvpn --config /home/xxx/vpnbook-uk1-udp25000.ovpn I always get this warning: Sat Feb 22 11:16:04 2014 WARNING: No server certificate verification method has been enabled. See ...
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0answers
29 views

How does security differ between any two standard users?

If we take two standard users, so ignoring admin/sudos, are the security limitations between one user and another down to their respective file permissions? So what Alice can do in the system vs ...
6
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1answer
358 views

What are the risks of running Nautilus as root?

Whenever I try to access files outside my home directory I get a permission error. People keep recommending running Nautilus as root by running the following commands in a terminal: sudo -i nautilus ...