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

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4
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655 views

Is there a guide for using GRSecurity and Precisew/ PAX?

I'd like to know if there is a guide of some kind for (successfully) configuring, compiling and installing GRSecurity w/PAX etc. in Precise? I basically am trying to build my own custom release ...
3
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0answers
57 views

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 ...
3
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0answers
361 views

Mirror using apt-mirror and exclud certain sections/categories

I'm currently using apt-mirror to create a local mirror of the debian repositories. As the mirrored repositories will be used only by machines destined to be headless servers and as an effort to ...
2
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0answers
55 views

Tiger: `rtm` is listening on socket XXXX

On my Ubuntu serve 12.04 LTS, Tiger is reporting a lot of stuffs like this: OLD: --WARN-- [lin002i] The process `rtm' is listening on socket 60404 (UDP) on every interface. NEW: --WARN-- [lin002i] ...
2
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0answers
51 views

How can I use a Verbatim Secure'n'Go USB key?

I have purchased a 4Gb USB key from Verbatim. How can I use it under Ubuntu? I do not need the "secure data" feature, and have still not saved anything on it, so formatting at low level would be OK. ...
2
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0answers
218 views

Upgrade Apache 2.22 to a version that supports ECDHE

I'm trying to setup my Ubuntu 12.04 server installation to support perfect forward security. It seems that the default Apache 2.2.22 build does not support ECDHE. Any suggestions on a good way to ...
2
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0answers
46 views

Is universe checked by the Ubuntu Security team?

I have a generall question regarding the Ubuntu universe repository. Does anybody know if they are checked by Ubuntu Security Team? Will they move or delete packages if any problem is encountered ...
2
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0answers
198 views

Setting Up Users and Permissions for a Multi-purpose Home Server

I have decided to repurpose an old grey box computer to be a combination NAS/home media server, headless torrent server, and minecraft server. I am using this both as a practical piece of equipment ...
2
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0answers
405 views

Integrity check against package repository?

When there are security updates, I review and install them as soon as possible and think about using automatic updates. From time to time I want to boot from a clean boot CD and check if the system ...
2
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0answers
104 views

How can I configure sudo to prompt for password and show the executed command?

The title says it all. How can I configure sudo to prompt for password and show the executed command? Rationale: if something gets aliased in the shell or I end up executing a function sudo instead ...
2
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0answers
125 views

Prevent that TrueCrypt gets Administrator rights

If I try to open a TrueCrypt drive, TrueCrypt asks me for my administrator-password (also when I am a normal user). I know, that i can prevent this password-asking by editing the sudoers file = giving ...
2
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0answers
728 views

Unable to fork: Cannot allocate memory

frequently getting 'fork: Cannot allocate memory' when running commands over ssh. I have 64Gb of RAM and usually 1~2Gb free. swap is more than 8gb free Ubuntu version:"Ubuntu 12.04.2 LTS" Desktop ...
2
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0answers
293 views

How can I add an SSL client certificate/key globally in Ubuntu?

I have a web server which requires a client certificate to establish an SSL connection (SSLVerifyClient require in apache). In firefox or chrome, I simply import the .p12-file containing my ...
2
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0answers
219 views

How can I check the checksum of an installed deb package against the same package in the repository?

Suppose someone got root access to my machine and replaced some files, e.g. Warning: The command '/bin/which' has been replaced by a script: /bin/which: POSIX shell script text executable Warning: ...
2
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0answers
94 views

How to inject or know if my wireless card is injectable

what ways or methods exist to know if a wireless card is injectable or can be injected (Packet injection). Answers should not include recommending me to use another OS that is not the official Ubuntu ...
2
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0answers
57 views

Why do I see a screen showing all text I typed during the session on logging out?

When I log off of Ubuntu 12.10, a screen appears shortly with all the text I typed during the session, including passwords and such. Is this supposed to happen? [update] The screen is fullscreen ...
2
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0answers
587 views

Why does network manager automatically choose WEP over WPA & WPA2?

I am on Ubuntu 12.10 and for some reason my wireless connection is using WEP when it is set to use WPA/WPA2 Personal. Also I should mention that I used to be on 12.04 and was experiencing the ...
2
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0answers
140 views

Cannot login to user with encrypted directory

I unknowingly deleted the .ecrypts directory while reinstalling Ubuntu 12.04. I created a default user by the same name while installing the new version. However, I couldn't login to the user after ...
1
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0answers
13 views

Fingerprint reader malfunction HP dv7

I have an HP Pavilion dv7 with a Validity VFS301 Fingerprint reader. I have tried multiple fingerprint reading software, including Fprint, but all of them give the same problem: It registers that ...
1
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0answers
18 views

install ubuntu on a hardware AES encrypted flash drive

I couldn't find the answer to my question after hours of search. I hope someone can help me out. I would like to install ubuntu on a flash drive. I followed to standard instructions for installing ...
1
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0answers
26 views

How to prevent accidental unlocking?

I have a machine at work running tmux and xmonad that I lock with slock. I frequently need to ssh into it from a remote location, and, based on testing this in person, accidentally killing the slock ...
1
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0answers
35 views

does ubuntu 14.04 use ascii-armor and how to turn it on/off?

does ubuntu 14.04 use ascii-armor and how to turn it on/off? the purpose is to test some exploit and knowing that would help, I'm still in the learning process. I'm already aware of the stack ...
1
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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 ...
1
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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 ...
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0answers
2k views

How to setup Squid Proxy Server on ubuntu 12.04 LTS?

I had tried using the ubuntu wiki guidelines to set it up on test server, and it worked. Though I would appreciate if anyone can provide me with few other links as this time I am going to install it ...
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0answers
41 views

How to disable Pointer Obfuscation on 12.04

I am working on a security project for school and need to overflow a buffer, I therefore need to overwrite the eip, but for some reason I can't. The A's that I overwrite the buffer with are spread all ...
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0answers
32 views

Does the “security” repository provides anything not found in the “updates” repository?

For the limited number of package I looked at (e.g. apache), I found that the package version in the updates repository is always newer than or equal to the version available in the security ...
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0answers
246 views

SSL certificates issue with Ubuntu 12.04 as guest OS in a Windows7 virtual box behind strict firewall

I have set up an ubuntu guest for Rails development in a Windows7-hosted virtual box. The windows workstation is a behind an extremely strict firewall with often fluctuating rules. The ubuntu host ...
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0answers
283 views

Apache shows blank white page after 2 to 10 hours

I am using ubuntu 12.04, it has to network cards, A = internal 10.0.0.0 and B public Ip , I have only apache2 installed, after 2 to 10 hours the website shows as a blank white page on the public ...
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0answers
80 views

How to unlock multiple encrypted partitions on boot?

I have two encrypted partitions sharing the same passphrase. I would rather not enter the password twice plus the login password. How can I unlock both partitions at once? Maybe even only enter one ...
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0answers
47 views

Can a weak Ubuntu user password be a risk for ONLINE security?

Can anyone gain an unauthorized remote access to my Ubuntu machine? Does having a strong user password really helps prevent this? Or firewall just doesn't let anyone in by default, regardless of the ...
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0answers
98 views

Good security setup in a LAMP environment

I have created a script to automate setting up my LAMP environment as well as installing some other software I find very helpful in coding. The script can be found here I only have one user "root" ...
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0answers
338 views

fail2ban block retry count always changes

As title mentions clearly, fail2ban block retry count always changes. I set all retry counts to 3; but sometimes it blocks me after 6 or 7 retries. How can set its behavior a constant value? I added ...
1
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0answers
121 views

Securing Amazon EC2 Ubuntu server

I'm about to launch a product I'm working on into alpha phase but before that I'd like to ask a bit about securing my Ubuntu server 64bit which is hosted at Amazon AWS EC2. The problem is my software ...
1
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0answers
89 views

Running a VPN server off Ubuntu Desktop?

I am unfamiliar with Ubuntu and Linux in general. I bought 3 old Dell PowerEdge 2650 servers off eBay for £20. I didn't really know what I was going to do with them, but for the price, they seemed ...
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0answers
100 views

How do I edit the commands that start a service in Ubuntu 12?

So I am trying out GBrowse, as we will use this later on. But then, I'm getting this ------------------------------------------------------------------------------------------------ 256000 features ...
1
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0answers
172 views

SSL connection fails to authenticate certificates for some pages?

This time, i am going to solve some irritating things with my networking on school, using ubuntu 12.10. I am perfectly able to connect to the proxy authenticated network the school uses. But my ...
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0answers
60 views

Potential security problem of passwords and key

Is this a potential security problem for ubuntu? I can access the "passwords and key" function without key in password.
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0answers
216 views

Secure APT GPG problem with Release files

I'm experiencing a problem with apt. We're using our own repository and the users apt is configured to check the peer and host of the repository. Furthermore the Release file is verified (with the ...
0
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0answers
15 views

Apport error reporting privacy issues

As apport is enabled by default since 12.04 I thought it would be important to get some much needed clarifications on certain privacy questions that have been bugging me. How paranoid is apport ...
0
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0answers
11 views

Are Ubuntu upgrades signed or encrypted?

When you download updates from the standard Software Updater (which I'm assuming is just a graphical front-end for apt), are these updates signed or encrypted between the server and the user, or are ...
0
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0answers
16 views

Want to know how how secure my system is with current settings

My system is at kernel 3.15.2 Mainline. I have Enabled the firewall with all ports closed. I have very strong passwords set for BIOS, Drive Encryption, and login SSH is Disabled. I have installed ...
0
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0answers
54 views

Is fingerprint-gui a security hole?

I have a Thinkpad T440 on Ubuntu 14.04. I use fingerprint-gui to allow me to login and use sudo by swiping a fingerprint. The worrying part is that anyone can run the fingerprint-gui program to ...
0
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0answers
38 views

Is Enabling UPnP in Transmission Worth the Security Risk?

I'm wondering if enabling UPnP so that Transmission can select a random port on start worth the security risk. I am not asking if having a listening port is worth the risk but instead is it worth the ...
0
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0answers
34 views

I am unable to generate a gpg key through the keyring program

Whenever I try to generate a gpg key through the system's GPG program, it asks for my name, email, and password then everything except for the GPG program's main window disappears. Upon using gpg ...
0
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0answers
21 views

How to create a fake packet that can be used in Ettercap filters

I am working on Ettercap filters and came across inject(file) function provided by it. This function simply injects the contents of file specified in the current packet. We can also drop the entire ...
0
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0answers
43 views

how to disable usb storage in ubuntu 13.10?

I want to block my all my USB mas storage and allow only devices like keyboard and mouse . I'm able to do so by following the KB. But the issue is that when I connect devices like mobile phones & ...
0
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0answers
29 views

Does the network proxy run after the VPN connection, no leakage whatsoever?

I'm inside a Ubuntu 12.04 Virtualbox guest (Bridged Adapter) and by finding 'Network' in the GUI, I can access three things, a VPN which I've configured to be an OpenVPN to a VPN, a 'Wired' connection ...
0
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0answers
23 views

Most secure way to install node?

Should I install node as root and then add user permissions to run it, or add a sudo user to the sudoers file and install and run it that way? It seems to me that adding the user to sudo would be a ...
0
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0answers
17 views

Error in decrypting WEP-encrypted .pcap file

I got a pcap file containing captured WEP packets, and a WEP key to decrypt it. I tried using both Wireshark and airdecap-ng to decrypt the packet. The key is correct, so the decryption was done ...