Ubuntu Security :: Remove All Privileges From CWD?

Jan 21, 2010

I am on the admin account of my computer and am trying to remove all privileges from CWD i have tried

chmod go-rwx ~
sudo chmod go-rwx ~

but when i pull up

ls -l ~

It is still showing permission in the g and o column.

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Ubuntu Security :: Wireshark Security Root Privileges?

Mar 25, 2010

Having read on the forums about some of the dangers of running Wireshark as root, I would like to know if anyone can suggest some alternative packet sniffers/network analyzers which will offer similar results but without the security issues. I am using Karmic Koala on a Fujitsu Siemens laptop with wireless router (firewall enabled)

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General :: Remove All Privileges From A Particular User?

Aug 5, 2011

I need to create a user in Fedora Linux(15) which only has privileges to print documents.Our college issues a printer to each lab and I need to create a new user on my Fedora which only has privileges to print.Network sharing is not an option, so is there any way by which I can a restrict a user from executing any commands except the necessary printing commands?

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Ubuntu :: Completely Remove MySQL - Root User Loosing Privileges

Jul 20, 2010

I Installed the maintained package, Day one everything worked fine, I set a dummy database and work on it from VM windows. Day two weird errors, I searched around couldn't find the problem, the error was related to The root user losing privileges. I don't remember the exact error. So I decided to Completely remove the DB with apt-get remove mysql-Server-5.1. It gets stuck during the uninstall, I left the machine for a day and a half to uninstall mysql. I realized it was no use, I tried to Restart and try again, but I am getting the same thing.

Code:
finito@finito-desktop:~$ sudo apt-get remove mysql-server-5.1
Reading package lists... Done
Building dependency tree
Reading state information... Done

The following packages were automatically installed and are no longer required:
dbconfig-common libhtml-template-perl mysql-server-core-5.1 libaprutil1-ldap
apache2-mpm-prefork apache2-utils libmcrypt4 apache2.2-common libt1-5
libaprutil1-dbd-sqlite3 apache2.2-bin wwwconfig-common php5-common
javascript-common libjs-mootools
Use 'apt-get autoremove' to remove them.

The following packages will be removed:
mysql-server-5.1
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 15.7MB disk space will be freed.
Do you want to continue [Y/n]? y
(Reading database ... 231901 files and directories currently installed.)
Removing mysql-server-5.1 ...
it stays stuck at Removing mysql-server-5.1 ...

I can't progress I am at the brink now, my only option right now is format, but I don't wanna do that. This setup is almost 5 years old and I have gone with many ups and downs with it. From Windows to 8.04 to 8.10 to 9.04 to 9.10 to now 10.04 each year loving the resilience of Ubuntu and the Linux architecture. I don't want to believe that this has killed my spree.

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Ubuntu Security :: Restricting User Privileges

Apr 11, 2010

I have searched somewhat this forum but haven't yet found a similar post using the keywords I entered but perhaps there is already a similar post then please refer me to it.I am trying to add a user account "Guest" to allow people on my laptop without giving them access to vital parts of the computer. Basically, I want them to only be able to view their own home directory and access internet. Nothing more.I have set the group to "guest" and changed the other home directories of other users to owner access only.

Guest still has access to root and is still allowed to perform actions in various critical areas (deleting files from for example my Windows 7 partition). This I also want to prevent. I was thinking to set each directory's permissions to Owner and Group only and remove Others access.My questions:

1. Will this have any undesirable impact (programs of main user accounts not able to access certain directories)? For guest user I don't care as long as internet works.
2. When I start User Manager and disable for Guest all options except "access internet" (so I also disable access to CDROM), the guest can still access the CDROM. Does this mean the User Settings menu has no effect or is overruled by something?

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Ubuntu Security :: Drop Elevated Privileges Through Terminal

May 2, 2011

How to Drop all elevated privileges through terminal?

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Ubuntu Security :: Any Way To Change Password For Root Privileges?

Jul 10, 2011

I've been using Ubuntu for like a year now. Whenever I want root privileges I just type sudo and enter my User password. I wanna know if there's a way to change this, in a way that My User password is: "ABC" and the password needed to have root privileges is: "ABC123". I have no problem using the terminal, I actually prefer it to any GUI, it just seems easier to me.

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Ubuntu Security :: Sudo Versus SU And Superuser Privileges

Jul 19, 2011

So, I'm not quite sure what the difference is? Is it that sudo allows you to "borrow" superuser privileges, whilst su allows you to actually log in as superuser? Also, when I sudo [command] and get prompted for a password, after I input it, things work just fine, but if I su, and then get prompted for a password, I can't log in as superuser... Why is this?

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Ubuntu Security :: Group Permission - Access Privileges On Several Folders

Jul 9, 2010

I have a problem access privileges on several folders like this one

Code:

It clearly says that I have owner and group read write and search (it's a directory) privileges.

I login as user master part of group events

Code:

But I can't access the folder (Permission denied).

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Ubuntu Security :: Keys In Notification Area Prompting Change To Privileges

Mar 28, 2010

Since reinstalling Ubuntu 9.10 and learning how to get the Notification Area working properly:

I've noticed an bunch-of-keys icon appearing intermittently in my notification area.

It appeared about 20 mins ago. I hovered the mouse over it and it generated the following text:

"Click on the icon to drop all elevated privileges"

I right-clicked on the icon, thinking I might learn something more about it. But it disappeared. No other messages were given.

It appeared again about five or ten minutes ago. I did not click on it. But it disappeared of its own accord after a minute or two.

What is this? Should I have clicked on it? What have I done? How can I get this bunch of keys under my control?

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Ubuntu Security :: Lost User Privileges To Mount Volumes From Naultilus?

Sep 13, 2010

I'm running 10.04 running daily updates. A couple days back, I saw an update related to mounting volumes. Not sure if this is what broke my system, but might be. When attempting to mount a partition from nautilus, I get a message saying I do not have authorization. It does not even ask for my password, just fails. I tried running updates and this asks for my password and accepts it fine. I opened disk utility from the menus and tried to mount the volume from there but also got the same permission denied, not authorized without even being asked for my password.

I then ran gksu palimpsest. I was asked for my password and was able to mount and unmount partitions from there. However, when mounted, my applications and nautilus cannot access the data in the partitions mounted using gksu palimpsest. In nautilus, I can navigate to /media/Data (the partition in question) but I get "THE FOLDER CONTENTS CANNOT BE DISPLAYED You do not have the permissions necessary to view the contents of "Data"." When I open nautilus via gksu in the terminal, I do have full access to the partitions.

How do I get my privileges back for my user account. I am the only user on the computer, and I have never set up a root account since my upgrade to 10.04 months ago. I tried of course the Administration->Users and Groups menu, but I am not permitted to change the account type or open advanced settings. I click the button, but nothing happens, not even a password request. Running gksu admin-settings on the terminal allows me access. My current settings are attached.

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Fedora Security :: Any Way To User Can Increase Or Lower Privileges?

Nov 6, 2010

Is there any way to user can increase or lower his privileges? I tried by "semanage login" but it works only for admin i think. I would like for example change range form s0:c0 to s0:c0.c10 and vice versa.

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Security :: Escalated Privileges - Determine/change Duration?

Jul 18, 2010

Ubuntu 10.04

When I execute a sudo or gksu evolution (e.g. synaptic package manager) I find that the escalated privileges remain in effect for a period of time. Sometimes, not often, the notifier applet shows an icon indicating that escalated privileges are in effect.

What I would like to know:

What is the default amount of time which escalated privileges remain in effect on my system?

Is it possible, if so how, to change this amount of time?

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Security :: Ubuntu 10.10 Is Not Allowing Amin Privileges To Admin User, Even Tho Sudo Works?

Feb 21, 2011

i am relatively new to ubuntu. Just recenty i have not been able to access certain files(for example the history and bookmarks in the firefox folder), download files individually from the internet(music,fonts,etc), recieving an error message

Quote: Originally Posted by firefox error console

Error: [Exception... "Component returned failure code: 0x80520015 (NS_ERROR_FILE_ACCESS_DENIED) [nsIFileOutputStream.init]" nsresult: "0x80520015 (NS_ERROR_FILE_ACCESS_DENIED)" location: "JS frame :: file:///usr/lib/firefox-3.6.13/components/nsSessionStore.js :: sss_writeFile :: line 2944" data: no][code]...

i have sudo priveleges and can install via update manager. i read somewhere that compizfusion might affect access permissions and i do use compiz and emerald at the same time.

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Ubuntu Security :: Actions Requiring Root Privileges Asks For Wrong User ?

May 24, 2011

In our group we use NIS and have a group set up called netadmin which is given root privileges on each machine. Each machine also has a localuser called localuser created and used during installation. When logged in as a member of netadmin, attempting any action that requires root privileges (e.g. installing software in Ubuntu Software Center) results in a prompt asking for localuser's password, not the current user's password.

Does anyone know the cause? Configuration issue or Ubuntu issue? We can get around it.

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Fedora Security :: Limiting Sudo - Giving Full Privileges To The Wheel Group In The Sudoers File

Feb 15, 2011

I have previously set up sudo via adding my name to the wheel group and then giving full privileges to the wheel group in the sudoers file. Now I choose to learn to limit that. Had noticed the most frequent use I have of sudo is to run yum update. This got me thinking, could I remove the wheel group privileges and add the following line in sudoers to limit the privilege to simply running yum, and furthermore, make it so I could run yum without a password:

## Allow root to run any commands anywhere
rootALL=(ALL) ALL
Troy ALL= NOPASSWD: /usr/bin/yum

I think that would in fact work (if I understood one of the pages here, it will work). However, upon further thinking I realized that in such a case then anyone sitting at my computer could then use yum, without a password, to install or remove any file on my system � probably not a good idea. As a result I have to ask, can I tighten the privilege even further such that the only privilege so given was to run �yum update� and nothing else? (for example if they ran �yum install� it would fail). If you can do it, how?

Last, I was going to limit the privilege, time wise and try wise, by adding the following to the sudoers file:

# Defaults specification
Defaults:Troy timestamp_timeout=0, passwd_tries=3

Will that really work to limit the elevated privilege so I don't have elevated privileges lingering about, or is there a better way to do so?

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Fedora Security :: Remove Nagging Security Screen?

Oct 10, 2009

If I leave the computer running for a few minutes without doing anything on it, this screen appears demanding that I enter my password, otherwise I can't get back to Fedora. I understand the necessity for this security feature in a work environment, but I'm just a home user and this security screen is just a nagging problem I don't know how to get rid of.

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General :: Security - Let Any User Perform Administrative Tasks On A System Irrespective Of His / Her Privileges On That Particular System?

Sep 26, 2010

I often get responses from people who first say: "Are you sure? You want your network to be exposed to the outside world?" I am not experimenting on a Production Server of NASA or any Security Concern Department. Friends, there is no harm in experimenting on your personal computer or on a test computer which is isolated from the production environment. Look at hackers! What do they do? If they don't know how security is breached then how would they come up with security measures?

If my question reads... "How to let any user perform Administrative Tasks on a Linux System irrespective of his/her privileges on that particular system?" then I would not get the right answers in the first place. They will say... "You are letting everyone destroy your system... are you sure you want to do that?" My question is: Why should we restrict ourselves from experimenting even if it sounds weird to other people?

I give you an example where it is desirable to let an unprivileged user perform certain tasks. You want to know if there are any employees in your office who are storing videos in their home directory and filling up the disk space to a great amount. You have a department called "Command Center or Data Center Operations or Help Desk" call it whatever you would, whose work is to monitor such activities, and you create an account "monitor" for them to monitor such activities but they are not able to do them:

[Code]..

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Security :: How Secure To Grant "reload" Privileges To A Normal User In MySql

Oct 15, 2010

One user in my company wants to run some flush cache queries on a MySql database, it needs "reload" privileges of Administration, how secure is to give this rights to a normal user ?

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Security :: Secure FTP - Root Privileges After Logging In Form A Macintosh And Could Browse The Root Directory

Apr 12, 2010

I run ProFTPd with TLS authentication on my Debian Lenny server. My problem is that despite of the fact that my users connect chrooted, one of my friends had root privileges after logging in form a Macintosh and could browse the root directory, too.

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Ubuntu Security :: Remove Authentication Completely From My Pc?

Jan 7, 2010

How can I remove authentication completely from my pc?
How can I edit the files present in the patrician filesystem?

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Ubuntu Security :: Malware + MBR - How To Discover/remove

Feb 28, 2010

Can a virus survive a reformat, running bootrec /fixmbr (both from the install CD), and then installing Ubuntu? Reformat meaning from the windows disk recovery console, using the format command for all partitions. Likewise, would a virus be capable of surviving just the first two steps alone without installing Ubuntu, just re-installing windows?

If one were to have an MBR virus on Windows or Linux, how abouts would you find or remove it without doing an entire disk wipe? And before someone goes "Linux is immune" take into consideration vulnerabilities on the user end.

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Ubuntu Security :: Remove String From All Files?

Oct 12, 2010

How can I remove this string from all files. I am not sure how it did get there

PHP Code:
<?php /**/eval(base64_decode('')); ?>

I tried this but It did not work

PHP Code:

find . -iname *.php* -exec sed -i 's/<?php /**/eval(base64_decode('')); ?> //g' {} ;

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Ubuntu Security :: Remove Delete Permissions On Certain Folders?

Feb 8, 2010

I have a Ubuntu file server with a mix of 30+ users ( mix of windows and linux ).All are members of the same group. All need read write create access. I want to prevent deletion of certain key folders. How can I achieve this ? sudo chmod -R nnnn ??

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Ubuntu Security :: Found LKL And Can't Remove - Isn't Showing Up In Synaptic

Apr 7, 2010

I found LKL on my computer. I need to remove it. It isn't showing up in synaptic and i can't figure out how to remove it. SUDO apt-get remove lkl tells me this. E: Couldn't find package lkl. i can't find it with the search and with google.

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Ubuntu Security :: Remove Home Folder Encryption?

May 3, 2010

When I installed, I selected the option to encrypt my home folder. I believe this is causing constant crashes now, since error message is user id/password related. Is there a way to remove the encryption?

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Ubuntu Security :: Remove The Whole Disk Encryption Without Reinstalling?

Jul 31, 2010

Is there any way to remove the whole disk encryption without reinstalling? I'm running Ubuntu 10.04.

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Ubuntu Security :: Remove 'sudo' Via The Software Center?

Jul 10, 2011

I've installed Ubuntu via UNetbootin from USB on my child's computer. It comes by default with the sudo command which I find really annoying to work with. I'd rather have my su command.

Now, while googling for a removal instruction, I've read that the sudo command is tied to system functions on some Ubuntu live systems and can't be removed easily. Does anyone know if this applies to the 10.04 live version used by UNetbootin and how to work around this problem?

If not, is it simply enough to remove 'sudo' via the software center? I find many tutorials on how to switch from su to sudo but not much about the other way around.

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Ubuntu Networking :: Remove WPA-PSK Security In The Netgear Router Settings?

Jan 1, 2010

I installed Ubuntu 9.10 netbook remix on my Acer Aspire One D250 computer. The broadcom wireless NIC succeeds in connecting to the network but only if I remove the WPA-PSK security in the Netgear router settings. What do I need to change in order to be able to secure my network?

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Ubuntu Security :: Remove The 6600/tcp Connection Ability From XWindow?

Apr 15, 2011

I've been reading a lot of articles on Xorg XWindow System having the ability to allow 6600/tcp for remote screen connections and I've been trying to find a way to remove the functionality without having to just dump XWindow and settle for CLI on my server. I heard it was disabled by default, but I just want to get rid of that ability completely by cutting it out of it's code and yes, I'm feeling very, very paranoid.

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