Ubuntu Security :: Possible Backdoor On Computer?

Apr 13, 2010

I was looking at my firewall(firestarter) logs. It shows that a program named Master's Paradise has been trying to make connections to outside from my computer on port 3129. Why would I have something like this on my machine? Is this something I need to be worried about?? Or is some legitimate program using port 3129 and the firewall log is still showing it as Master's Paradise?

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Ubuntu Security :: Data Cha0s Connect Back Backdoor

Aug 28, 2010

I believe that the attacker somehow got in through the ssh daemon(OpenSSH 5.3p1) on June 12. From here, a user account named "crond" was created(can anyone confirm weather this is normal?) and according to the log, this account was accessed several times between Jun 12 and Jun 18 from the same ip address. Also on Jun 12, the MOTD on the ssh server was messed up and remained that way until it was reinstalled. The default ssh client(OpenSSH 5.3p1) was made completely non-functional.

I became alerted to the problem when my ISP advised me to run a virus scan on the machines on my network. Not knowing of any linux based anti-virus software, I decided to check for suspicious files on my hard drive. I found one, in the /tmp directory was a subdirectory called ".popscan". Inside was a script and a list of about 40 very default sounding usernames and passwords. There was also a file called "back.txt" in the root of my filesystem. Which is a pearl script that aparently spawns a shell.

At this point I disconnected the server from the internet and mirrored the drive. I found a suspicious home directory for "crond" I'm hesitating on setting up the server again for fear that it might just get rooted again. I would also like to find out how he got in so it can be prevented for other people aswell.

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Ubuntu Security :: Hidden Backdoor In AT&T 2Wire Modem/Router?

Aug 11, 2011

My 2Wire router/modem I got from AT&T for my DSL has port 3479 TCP open and I can't figure out how to close it. It's open to the entire internet. From a quick google search it's some port AT&T can use to update the modem's firmware or something.Consider how in bed AT&T is with government agencies it seems like a easy way for the government to get into my home network just by using what seems to me a backdoor put there by AT&T. Anyway to close this or secure it. Right now I'm using the hardware as my main router for my home network. I have Linsys I modded with DD-WRT. I'm thinking of re-configuring my network to use the DD-WRT router as the main router and the 2wire just as a modem. The 2wire is a hybrid modem/router and I'm kind of lazy and don't feel like re-configuring my entire network if I can just close the port.

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Server :: Create Backdoor Account To Use To Get In If Divulge Root Password

Nov 23, 2010

I have a Debian VPS webserver running a forum, and I'm currently looking for a secondary tech-admin. Since they'll have to have the root password for the server, I'm looking for a way to create a backdoor account that I can use to get in if they divulge the root password, or go crazy and lock me out. Is there a way to do it?

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Slackware :: H Article: Vsftpd Backdoor Discovered In Source Code?

Jul 4, 2011

Before anyone panics, the source tarball for Slackware 13.37 doesn't appear to be the "bad" tarball that Chris Evans mentions here:

[URL]

Code:

$> sha256sum vsftpd-2.3.4.tar.gz
b466edf96437afa2b2bea6981d4ab8b0204b83ca0a2ac94bef6b62b42cc71a5a vsftpd-2.3.4.tar.gz

I checked str.c for the call to vsf_sysutil_extra() if the user is specified as and I also checked for the rogue shellcode in sysdeputil.c but I didn't find it, so it looks like the backdoor was uploaded recently.

[URL]

Quote:

Chris Evans, aka Scary Beasts, has confirmed that version 2.3.4 of vsftpd's downloadable source code was compromised and a backdoor added to the code. Evans, the author of vsftpd - which is described on its web site as "probably the most secure and fastest FTP server for Unix-like systems" - was alerted on Sunday to the fact that a bad tarball had been downloaded from the vsftpd master site with an invalid GPG signature. It is not known how long the bad code had been online.

The bad tarball included a backdoor in the code which would respond to a user logging in with a user name "" by listening on port 6200 for a connection and launching a shell when someone connects.Evans has now moved the source code and site to [URL] a Google App Engine hosted site. The GPL-licensed source code can be downloaded (direct download) from the same site, along with the GPG signature for validating the download, a step that Evans recommends. Evans says that the lack of obfuscation and lack of victim identification leads him to believe that "perhaps someone was just having some lulz instead of seriously trying to cause trouble".

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Ubuntu Security :: My Computer Is Being Hacked / What To Fix It?

Feb 27, 2011

I have windows computer and it is being hacked.About month ago or more some one hacked my router and install new firmware from Firmware Version: Talisman/Basic V1.2.9a

My router is linksys and SSID got changed to sveasoft.I had WPA set up and MAC filtering .

Some one hacked my router and change Firmware Version.And user name and password also got change to just admin.

Well now I got a pop up from my Kaspersky saying network attack scan.generic.TCP 74.63.245.168

only thing I can find on it http://whatismyipaddress.com/ip/74.63.245.168

It is Limestone Networks in Dallas.

Some strang things have been happing to my computer in past 4 months and is getting worse.

I have no firewall or router now.And have not gone to the store and get new router yet and I'm thinking of formatting my computer and putting linux and get good firewall like zone-alarm.

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Ubuntu Security :: Gufw - Cannot See The Other Computer Files

Jan 1, 2010

VERY GREEN to Ubuntu. My setup:

1. computer A connects to the internet through usb dial up modem
2. computer A & B are wirelessly networked through an ADHOC network.
3. computer B doesnot need to connect to the internet.

I've installed the GUFW. If I enable it I can not see the other computer files. I use static IPs for both. I tried setting a rule but I get stumped were it asks for the port. I'm not all that familiar with ports.

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Ubuntu Multimedia :: Set Up As Security Camera On Computer?

Jan 8, 2010

I have a creative pc cam 300 that i have been trying to set up as a security camera, on a computer running ubuntu 9.10. I tried installing the spca5xx driver, but i can only find it for old versions of ubuntu and it doesnt work. Does anyone know how to get the driver working?

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Ubuntu Security :: Boot Usb On Work Computer ?

Feb 11, 2010

I work in a retail store at which there is a computer set up in the corner for customers to browse the stores website on. The problem is that that is all it will let me do. I get board, and want to do other stuff. Once windows starts, it skips the logon on screen and once loaded the only thing that can be done on the computer is browse the stores website.

However, if I unplug the computer I can while its starting up get into BIOS. So here im wondering two things. 1) If I put in the USB, boot from it, and load ubuntu (even though I will only be able to use the default programs as theres no way I would want to install it on the work computer), will I get fired? In other words, is there a way if there monitoring the computers to know what im doing or because its a different OS will I be fine. 2) Alternatively, in BIOS there is an option to disable network administration.

For this my question is the same, if I disable it, do fun stuff on the computer all day, the re-enable it before I leave is there a high change of the network administration catching on to this or no.

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Ubuntu Security :: Make Computer More Secure?

Dec 9, 2010

I have very little security and networking experience. What can I do to make my computer more secure?

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Ubuntu Security :: ISP Keeps Complaining About Infected Computer

Feb 27, 2011

For a while my ISP has been sending me emails regarding an infected computer or computers on my local network. There are 4 computers running linux and 3 running windows on said network (3x ubuntu, gentoo, 2x windows server 2003 and windows 7).Now, I haven't used Windows in oh so many years and am not responsible for those computers on this network. Does it seem like this is a virus on a Windows host or should I research and adjust my iptables settings on the router? The applied anti-virus software (I don't know which one) apparently does not find any infections. On my workstation I'm using spotify and win32 office through wine, both obtained from legal and trusted sources, and would thus not consider my wine environment a threat.

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Ubuntu Security :: Computer Has Been Hacked / Monitored?

Mar 22, 2011

my computer has been surely hacked for at least more than two months; my private information are being hacked and spread around! I initally used Windows Vista and I had the firewall off and no antivirus software. When I realized that my OS had been hacked, I began turning my firewall on and installing security softwares, but nothing stopped the hack.

Yesterday, I erased all my partitions and installed Ubuntu 10.10. I installed rkhunter and a firewall. I changed my static IP adress, at least for the sake of knowledge, to another one, then I got disconnected since my router only allows my old IP.

When I'm about to write my admin password, I disconnect from the network. I've scanned my system using rkhunter, and the result is a list of 30 suspicious files!

Can I adjust my router in a way that it can allow any IP adress? If yes, can I have a non-static IP adress? How to prevent the hacking in the first place? However, I believe, I don't know yet, that my Ubuntu has also been hacked...

If I can't get rid of the hacker(s), then I should permanently disconnect from internet and find another way to receive information anonymously through the internet.

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Ubuntu Security :: Computer Shutdown During 11.04 Install?

Apr 29, 2011

My laptop randomly shuts off, at first I thought it was an issue with the laptop overheating but during the install of 11.04 I made sure the laptop had a fan blowing on it constantly and checked it and determined it couldn't have overheated. My problem now is that I was able to use a live cd to access my old files but was presented with only two files stating that my files were encrypted, I'm don't ever recall encrypting my files and so I'm without a passphrase.

What I'm wondering, is there a way to gain access without the passphrase? Or is there a way to fix the corrupt install?

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Ubuntu Security :: Install Tripwire On Computer?

May 1, 2011

I am going to try to install Tripwire on my computer. I do not know why or how to configure Tripwire policy and configuration files.

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Ubuntu Security :: How To Know If An Intruder Had Attacked Computer

Aug 2, 2011

How does one know if an intruder had secretly accessed one's system? Does system log help? It seems it does but I am yet to figure out how to understand those files. Can anybody please help? Or are there other ways to confirm that. It may happen that the intruder had accessed some vital information but so far had not done anything malicious.

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Ubuntu Security :: Can Flash Player Bug Take Control Of Computer

Jun 6, 2010

Reading from this article New Flash Bug Exploited By Hackers : How to avoid it? In particular the article said

Quote:

A new attack on a Flash bug has surfaced that would give attackers control of a victim�s computer after crashing it, reports PC World. Adobe put out a Security Advisory about this on June 4. It is categorized as a critical issue and all operating systems with Flash are vulnerable including Windows, Linux, and Apple and it is also found in the recent versions of Reader and Acrobat.

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Ubuntu Security :: Broke Into Computer - Verify Attack?

Dec 28, 2010

mpg123 suddenly started playing a police siren occationly. I checked the process once I heard it, and root was the process owner. How could this happen? Have someone broke into my computer? If so - how could I verify an attack? I run Ubuntu 9.10.

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Fedora Security :: How To Tell If Computer Is Being Attacked

May 16, 2010

[URL] This web page says: "The team set up weak security on four Linux computers with Internet access, then recorded what happened as the individual machines were attacked. They discovered the vast majority of attacks came from relatively unsophisticated hackers using "dictionary scripts," a type of software that runs through lists of common usernames and passwords attempting to break into a computer."

How did they "record what happened as the individual machines were attacked"? How did they figure out that "the vast majority of attacks came from relatively unsophisticated hackers using 'dictionary scripts'"? What I am really getting at is that I've searched the net and found lots of advice on how to detect if your computer has been hacked but I haven't found ways to know if your computer is being attacked. Obviously, this group did that.

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Security :: Computer Is INFECTED According To ClamAV?

Apr 11, 2010

I recently ran a virus scan on my CentOS server using ClamAV's "clamscan" command to scan my entire system for virus. After the scan was complete it says that I have 1 infected file on my computer. I COMPLETELY FREAKED OUT! Is there some kind of log that I should read to see where the infected files are? Also does ClamAV just scan your system for virus or does it scan and remove the virus on the computer.If you know of an alternative open source security software,

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Security :: Computer Has Been Infected With Trojans?

Jan 7, 2010

I'm now running Ubuntu 9.04. There are 2 accounts on this computer, one is linux, the other is ubuntu. Before New year, everything had been fine. But after new year, I came back and found that the password of this account linux has been changed. So I fixed using my rescue disk. But since that day on, it seems that this password changes everyday somehow. Everyday when I'm trying to log into my Ubuntu System using the account linux, it says login failed. However, i can still login using the account ubuntu. I'm really confused. Why is this? I checked the date of expiry. Everything seems to be fine.

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Ubuntu Security :: Access Remote Hard Drive From Another Computer

Jan 12, 2010

What I want to do is pull data from any of the hard drives attached to my Linux box from my Windows machine. I have been moving small amounts of data from the drives to my OS drive and those parts share easily, but I want to move away from that method to move large amounts of data at the same time.I have tried using Samba as it is used for file sharing between systems and that I have to give my Windows box permission through Samba.

Trick is, I'm not sure where to start, though I have an idea and wanted to know if this is the right track before I start editing my file system.

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Ubuntu Security :: Which Process Make Sudo Gconftool On Computer

Jan 29, 2010

On my HTPC/Server unbuntu box I have installed logwatch in order to get a daily look on my computer activity.

And I often have this line in the report :

Quote:

root => my_user
-------------
/usr/bin/gconftool - 3 Times.

The corresponding line in auth.log are :

Quote:

./auth.log:Jan 28 07:59:31 sweetBox sudo: root : TTY=unknown ; PWD=/ ; USER=my_user ; COMMAND=/usr/bin/gconftool --get /system/http_proxy/use_http_proxy
./auth.log:Jan 28 07:59:32 sweetBox sudo: root : TTY=unknown ; PWD=/ ;

[Code].....

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Ubuntu Security :: Innocent Website Tries To 'scan' Computer / Should I Get Protection?

May 6, 2010

So I forgot how to do something in Compiz and I quickly Googled it to find the answer. On the first or second link I clicked, a pop-up box opened from Firefox saying that I should scan my computer. Immediately, I pressed the X button, but a page started to load that tried to "scan" my computer. I closed out Firefox and re-opened it. I did the exact same search again on Google, but I clicked on the cached view of the site. It was harmless enough--a blog with some ads on the side of the page. I'm assuming that it was one of the ads that somehow must have taken over the page.

Anyway, I know that the discussion of anti-virus programs is not anything new, but I would like to know if this virus may have affected Ubuntu. What would you guys recommend in this case?Also, after running the update manager, I received a pop-up box asking if I would like to update Grub. Is this a normal part of the update, or could it be a virus? I'm a bit paranoid, being from the land of Windows.

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Ubuntu Security :: Scan Windows Computer From Laptop Via Network?

Aug 30, 2010

How do I scan a windows computer from my Ubuntu laptop via the network? I have Ubuntu 10.04 on my laptop. First Windows computer to scan has Windows XP Home Edition Second Windows computer to scan has Windows Vista Home Basic I have Avast 4 workstation and KlamAV insalled on it. What is the steps to make my computer scan those windows computers. And how do I set up my firewall to work with firefox and empathy?

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Ubuntu Security :: Setting Up A Public Ally Accessible Computer?

Jan 13, 2011

Our local community wants to provide broadband access for people who don't own a computer. I have been given the task of setting this up and I am going to use Ubuntu. Internet access will be via a usb dongle to a T-Mobile 3.5g network. Initially we are intending to limit access to just Internet browsing. Most users will probably be older people, rather than teenage hackers. configuring/securing a default Ubuntu install for this sort of use.

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Ubuntu Security :: Locked Out Of Desktop Computer - Password Isn't Working?

Feb 7, 2011

Some how I seem to be locked out of my desktop computer. My password isn't working. For some reason all of a sudden it seems to have stopped working. I tried to reboot and now I'm locked out, I can't login. And I'm the only sudo user. How can I fix it or even reset my password

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Security :: IRC Flood/DDoS Cause A Computer To Freeze?

Nov 10, 2010

my computer froze solid, and it would not react to anything. X didn't react to Ctrl+Alt+Backspace, not Ctrl+Alt+Del, so I had to turn it off using the power button.

This is the first time my computer freezes like this, the log files did not reveal any HW errors. Is it possible that someone in the channel did not like my level of Java skill, and flooded me to disconnect?

By the way; Im using slackware 13.1 with the default kernel (2.6.33.4) and irssi as IRC client.

I know that if you eg. ICMP-flood someone, the traffic will be denied and, but can it provoke other behavior from the computer?

So my question is; can a IRC flood/DDoS attack cause a computer to freeze sub zero?

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Security :: NSA On Computer Network Attack & Defense

May 3, 2010

Quote:

The 605-page PDF document reads like a listing of the pros and cons for a huge array of defensive and counterintelligence approaches and technologies that an entity might adopt in defending its networks. Of particular interest to me was the section on deception technologies, which discusses the use of honeynet technology to learn more about attackers� methods, as well as the potential legal and privacy aspects of using honeynets. Another section delves into the challenges of attributing the true origin(s) of a computer network attack.

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Ubuntu :: Make Computer Accessible Without Opening Gaping Security Hole?

Mar 4, 2010

my son is 15, autistic and mentally retarded. he is moderate-low functioning and loves to watch barney the dinosaur, thomas the tank engine and other young children's programming on videos on his computer. he can talk in a limited way and can read out loud at about the first-grade level, though he seems to have little or no comprehension of what he's read (hyperlexia).i'm having problems with viruses and spyware because he lacks the judgment that keeps the rest of us from clicking on every window that pops up. we've had a particularly nasty crop of ad-ware viruses lately that pops up graphic porn ads even when the browser is closed. i've had enough of this.

the computer is an ancient dell dimension 4600 desktop (circa ~2002) running windows xp. i've run ubuntu from a live cd and installed flash as a test. videos videos play fine, so that's not a problem. i don't really want to replace the computer becasue it still works and is only used by him to run firefox. i am willing to buy a new computer if that turns out to be the only option.i've been using ubuntu exclusively on my laptop for several years and i would like to remove windows from his computer and replace it with ubuntu. i'm wondering how i can make his computer as accessible as possible to him while not sacrificing too much security.my son has very poor fine motor control over his hands. he can use a mouse with some difficulty, but using a keyboard is out of the question. he can use the mouse to click on the shortcuts to his favorite videos, but i can't think of how he would be able to enter a password for his account. not only does he have the fine motor problem, but he is not able to remember any usefully secure password.

does anyone have any ideas about how to make his computer accessible to him without opening a gaping security hole? two ideas that i've kicked around are creating a user with absolutely the minimum privileges required to use firefox and no password or finding some way to enter a password that doesn't require a keyboard. i haven't come up with how to implement either of those ideas successfully.

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Fedora Security :: Programs To Protect My Computer On Internet?

Apr 29, 2009

are there any programs that will protect my computer on the Internet. Just started using fed 10 from windows so i am not sure what i need to do. I am using an acer aspire 5630 laptop.

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