Ubuntu Security :: Unable To Login Using Su Or Sudo?

Oct 18, 2010

At the terminal prompt, I can't login using su nor sudo. I can only login as root at the dialog level. How do I correct this?

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Ubuntu Security :: Unable To Deny Sudo Access To Regular User Account.

Dec 19, 2010

I made a Desktop User account. When I went on that account, it allowed me to execute sudo as if I was an administrator. I don't know what might be causing this. I do have ufw set up and blocking incoming connections. Do you guys know what might be at the root of this?Also, when I used sudo from the user account (which I shouldn't have been able to do), I provided the password for my admin account.

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Fedora Security :: Cannot Open /var/db/sudo After Sudo Package Upgrade?

Sep 16, 2010

A day ago I finally got around to upgrading the PackageKit installation that had been sitting for a week and a half, so I found a new upgrade for sudo available - the one that gives the sudoreplay command, I forget which version number it is exactly. When I try to use the sudo command I get this notice in my terminal:Code:Can't open /var/db/sudo/me/1: Permission deniedI didn't get it before. What do I have to do to make it open? I'm using SELinux in enforcing mode if that helps.

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Security :: LADP User Unable To Login Via SSH?

Sep 15, 2010

My case is that, the LADP user connected could not login via SSH. This user could login in the system console. And all the other users could login within ssh. And I was wondering whether any one could suggest which place to check next. And here is the detail: I was using SUSE 11.3 when I met this error. PAM module is used, and the corresponding files in /etc/pam.d/ have all been updated. Here is what I've added:

Code:
yl-1:/etc/pam.d # fgrep ldap *pc
common-account-pc:account [default=bad success=ok user_unknown=ignore] pam_ldap.so

[code]....

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Fedora Security :: Terminal Equivalent Of "sudo" Is It Still Sudo/KDEsudo

May 29, 2010

I am new to fedora (been using debian based distro's for the longest time). With the new release I decided to give FC13 (The kde 64 bit spin) a try. I told it to wipe my entire hdd and encrypt the partitions. The partition manager made a few LVM partitions which I assume are encrypted.

The problem I am having is that if I attempt to use an application that would normally need root access to run, I am not prompted to enter my root password. Instead, I am required to logout and log back in as root. Is there a way to make it so that FC13 will prompt me to enter in my root password so I do not need to log in and out? Or is there something Different I should have done during the install process? Also, what is the terminal equivalent of "sudo" in fedora, or is it still sudo/KDEsudo

I also have not used SE Linux before. Do I need to manually enforce the permissions for my applications and generate my own profiles for it, or is that done automatically?

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Ubuntu Security :: Login Panel Is Worse From Security View Point

Jan 19, 2010

ubuntu 9.10 login panel is worse with respect to ubuntu 8 since now all the users with names are shown without a way to hide them!Why don't keep the old way at least as an option?

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Ubuntu :: Use Sudo Without A Password For Non Interactive Login Using Plink ?

Jun 2, 2010

Before you say you shouldn't do that bla bla bla. I know why i shouldn't.

However i have a problem with running sudo commands from a non interactive command line script run using plink.

The automated script needs to use chown and give the current user ownership of some files and folders created by another user.

I can't use things like sudo -s etc as it requires that i enter a password.

I have setup public key authorization in order to login. Do i have to give the root user a password and log in as that. I would prefer not doing this but if that is the only solution i guess i'll have too.

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Ubuntu Security :: Unflattering Things About Use Of Sudo?

Apr 9, 2010

I just read an article saying some unflattering things about Ubuntu's use of sudo. My question is this true?[URL]..

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Ubuntu Security :: Allow Program To Be Run As Administrator Without Sudo?

Jun 7, 2010

Certain commands like:
fdisk -l
nmap -sT 192.168.0.1/24
iftop

require administrator privileges to run. A while ago i read a post(forgot where i read it) about being able to let a user run these commands in a script (that contains the desired command) created by the administrator/root without the user having to do a sudo and entering a password. Does anyone know how i can go about doing this?

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Ubuntu Security :: How To Change Sudo Behaviour

Jun 14, 2010

I've enabled root under Ubuntu (i know frowned upon), I'd like to change the default behaviour of sudo so that rather than requesting my password (the password I logon with), it requires the root password.

Have searched the forums but can't find the answer.

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Ubuntu Security :: Sudo Su. No Password Needed

Mar 22, 2011

why when I type sudo su in a terminal there's no need to enter my password, I just go straight into root

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Ubuntu Security :: Sudo Permission Not Being Revoked?

Apr 1, 2011

I am using Ubuntu 10.04-alternate-amd64 for full disk encryption. After getting my updates which i get as soon as they are released. I am getting the issue temp root (sudo) password is not being revoked. After using any app that requires the use of sudo the permission for it does not get removed like it normally does.

I have tried logging out then back in, which usually removes the permission, this no longer works, also tried waiting and even after 1 hour permission still there. The only work around I have found is to use the terminal to execute the required programs then after closing terminal the temp permission is now removed like it should be. This issue has effected all of my systems and a friend of mine as well, (friend uses same distro).

To replicate issue:

1) Boot system.
2) Login.
3) Check for updates or any other app that uses root permission.
4) Logout
5) Login
6) Repeat step 3
7) App will not ask for permission it will use root permission automatically.

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Ubuntu Security :: Remote Sudo In Natty

May 30, 2011

When I access a remote Natty client using VNC I cannot use the sudo command in a terminal. In fact, the terminal closes itself as soon as I type the sequence sud. Even su d. Or su d.

Sua, su a, su c, su e do not cause the terminal to close itself.

This appears to be some sort of new security "feature".

How do I "work around" it?

[edit]
I'd better elaborate.

I have a remote Natty running 11.04 64-bit desktop version. I have installed tightvncserver on it. I log in on 5901 from a Ubuntu 10.04 64-bit desktop using vinagre. The desktop works fine except when I open a terminal in it and type sud. As soon as I type the d the terminal vanishes. This appears to be a deliberate feature. I also log in to other clients that run 10.04 and this does not happen. I have run Mint 11 in VirtualBox on my local machine and created the same remote desktop and viewed it from mint 11 itself. Same thing happens.

It seems to me that 11.04 has been modified to kill a terminal that is part of a VNC display when sud are typed.

how to remotely administer a 11.04 desktop?

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Ubuntu Security :: Updated Browsers Using Update Manager Have Lost Security Login Pages For Web Mail?

Mar 3, 2011

i updated both browsers i have and lost my secure log-in pages (no padlocks showing ) concerning different Web mail accounts.Just before i did these updates i checked an unrelated thing on-line regarding my sound card of which i kept a copy of and got this message below :

!!ALSA/HDA dmesg
!!------------------
[ 12.762633] cfg80211: Calling CRDA for country: AM

[code]....

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Ubuntu Security :: Bad Login Protocols - Graphical Login For Gnome Sizes Itself To Accommodate A User's Exact Password Length

Dec 14, 2010

I'm seeing really bad user login format under a standard installation and am wondering why ubuntu does this as default. I have noticed that the graphical login for gnome sizes itself to accommodate a user's exact password length. This indicates to me that somewhere on the unencrypted part of a standard installation with user encryption contains at least some indication of the content of the password length which seems a security flaw even if not a complete hole, it majorly reduces the number of attempts a cracker would have to cycle through.

And that's assuming that *only* the length is contained. Furthermore it seems that it would be MUCH better to simply display the number of characters entered into the pw field and allowing the gui to expand itself from an fixed size as the field is filled out so the the user still receives visual feedback for entering characters. Either a simple character count display should be entered into the field or a 10 dot to new line so that one can visually quickly count the number enter by multiplying from a 10base graphical observation.

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Ubuntu :: Sudo Or User Login Not Working - Fresh Install?

Aug 17, 2011

I have this weird problem after a fresh install of Ubuntu 11.04: I can enter desktop using autologin but if i open a terminal i cant run anything as superuser ried:

sudo -i
sudo su
sudo <command>
gksudo <command>

i get somthing like: error, invalid password etc etc 3 incorrect login attemtps Also if i ALT+F2 or close gnome session i cannot login back with my username, same error notes: 1. the password is right, i did a second install of ubuntu to make sure it was not my mistake 2. groups seems ok, user is in admin groups 3. I have a similar error, same computer but on an old installation that i ve updated since ubuntu 9.04 to 10.04, then 11.04 but. But here if i try the password a couple of times then i get it working.

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Ubuntu Security :: Sudo Chmod 777 - Segmentation Fault

Mar 7, 2010

In a rage of anger against VI I decided to open my firewall config file in gedit, made some changes and was then confronted by the fact that it was read only. I decided to change the permissions for the whole of the /etc folder with:
Code:
sudo chmod 777 /etc/*

This also changed /etc/sudoers so that now whenever I try to use sudo I get the error:
sudo: /etc/sudoers is 0777, should be 0440
segmentation fault
I cannot change it back to 440 because I need sudo to do that.

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Ubuntu Security :: Sudo User_Alias Referenced But Not Defined?

Sep 3, 2010

I'm trying to configure my SUDO entries, for this I've added the next lines:User_List ADM = usernameADM ALL=(ALL) NOPASSWD: ALLWhen I close and save the file sends me the following warning>>> /etc/sudoers: syntax error near line 12 <<<visudo: Warning: User_Alias `ADM' referenced but not definedhat now?

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Ubuntu Security :: Automatic Sudo Privilege For Lacie 4L?

Nov 16, 2010

Users of Lacie's 4L which is used to burn labels for your Lightscribe disks, are required to have the app run with sudo privileges, (the command being: gksudo 4L-gui). On an older version of an Ubuntu install, I had it set up so that it did this automatically, without it, (or me), being asked for a password. I thought it was something I added to the sudoers file, to give 4l-gui automatic authority, but I forgot how i did it.

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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 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 :: Startup Login Screen Security?

Aug 27, 2010

just migrated to Lucid from Jaunty and noticed that the login startup screen looks more like windoze (shows all authorized users).One of the endearing security checks with Unix was that if you had access to a console you had guess both userid AND password - the system wouldn't tell you which was wrong.I feel that we have lowered security by making the list of authorized users visible on a console. Is there any way to turn it off and force users to enter both userid and password?

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Ubuntu Security :: Security E-mails At Root Login?

Sep 8, 2010

Whenever I login as root, an e-mail with the subject "Security information" is sent outwhere the e-mail address for this message is configured? I need to change it (or perhaps disable it).

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Red Hat / Fedora :: Use Automatic Login With Sudo - Not Working

Apr 3, 2011

I'm trying to use automatic login with sudo like this:

But in both case I'm getting the same error:

My linux version:

My sudo version:

My terminal settings:

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Security :: Cmnd_Alias Entries In Sudo?

Jan 5, 2010

Like many (most?) home users, until now I've had my regular userid in sudoers as "ALL = (ALL) ALL". It occurs to me that, even though my machine has no open ports, this is probably not a good idea - just in case my firewall suddenly burns down. So, if my thinking is right on this, I'm wondering if there is a generally approved list of Cmnd_Alias entries? At this point, I've decided to only add entries as I use them, and to try to honestly appraise my need to do the entry as sudo, vs opening a virtual console as root. My root password is non-trivial.

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Security :: Using Sudo Instead Of Root Be Safer?

Apr 5, 2011

Consider: [URL]

In security terms, would using sudo instead of root be safer? I'd actually prefer to use this if so; I like sudo an awful lot. (It's Mark Shuttleworth's fault)

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Security :: Sudo Asking For Password When It Shouldn't?

May 9, 2011

I have a RHEL 5.5 system set up with two users in the sudoers file to run certain commands without a password prompt.I do not have "Defaults requiretty" in the sudoers file.However, for both users, when I issue: sudo -l, it prompts for a password and logs in /var/log/secure:sudo: userx: no tty present and no askpass program specified

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Security :: Sudo To Disallow Certain Commands?

Jan 10, 2011

trying to devise a new sudoers configuration while building a new SOE and would like to force everyone (including system administrators) to use rootsh in favour of doing things like sudo -s, sudo bash, sudo tcsh and so forth. Effectively, use sudo to use any shell other than rootsh. Is there a way to allow users to run anything they want except shells. I realise this is a default permit which inherently is defective, but I'm not convinced that going through the 1559 executable commands of my (as yet incomplete) built system to decided on the likely 1000+ commands I would want to be genuinely allowed. As I said this is for system administrators first, and I'd like to forcibly instil the habit of sudo <command> or using rootsh to get an audited shell. But I know people are already not doing enough sudo <command> as it stands, rather they switch to bash.

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Security :: Sudo To Root Without Password?

Jan 26, 2011

We have a couple of clusters that are running Oracle. If you're familiar with Oracle you know that it basically has to be installed as root. Something I detest. anyway, when we are building out the box, we change the root pw and give it to the DBA team to do their installs and configs. When they are done, we change the root pw (and do not give it to them), and configure sudo to allow them the rights needed to manage Oracle and their databases.

Now however, we have a different situation. The DBAs need access to uninstall and reinstall components and make modifications on an ongoing basis. Since we only support OS and hardware, not app, they are requesting permanent root access. I promptly told them no, and the politics ensued. Their manager went to their director, who went to my director, and suddenly an exception is given for his good golfing buddy. So here I am, forced to turn lose DBAs on my clusters with full root access/pw. I need a way to allow specific users (or perhaps a specific user group) the ability to become root WITHOUT sharing the root pw with them.

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Ubuntu :: Change Both Login/sudo And Default-keyring Passwords With One Operation?

Jan 24, 2010

How to change both the login/sudo and default-keyring passwords with one operation? If I recall correctly, to change one'slogin and sudo password, one must use `passwd` or System>Preferences>About Me>Change Passworddefault-keyring password, one must goto Accessories>Passwords and Encryption Keys>Passwords, rclick on keyring>Change PasswordIs there a way to do both with one operation? preferably from commandline? preferably in karmic?

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