Fedora Security :: How To Viruses Infect A System?
May 25, 2010
I am a very new Linux user. My first OS is Fedora 12, which I just recently installed into my laptop. So far, I am thoroughly enjoying it. I do have a question bugging my mind though. Linux systems are known to be very safe from viruses, mainly due to programmers targeting the Windows platform. In Windows, common methods for virus infections are from infected executable files, external drives autorun... ETC.
Now my question is how do viruses spread into a Linux system? And with so few viruses known to exist for Linux systems, do I really need to be aware and take precautions for viruses (For example in Windows, disabling autorun function for external drives)?
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Mar 26, 2010
I would like to use my Ubuntu 9.10 Karmic system to scan and clean viruses from Windows based HDD. I have KlamAV, AVG, and AVAST. I couldn't get F-prot to work. I don't find a debian package of it and don't know how to install tar.gz and the tutorials don't help a lot. Are there other antivirus solutions which are good for cleaning Windows OS but work on Linux/WINE? I wonder if I can install antivirus software in WINE and scan with no problem the hard disks.
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Feb 4, 2010
Let's say I have an avi file that contains a virus for ntfs windows xp sp3. I put that file on a linux ext3 partition. Then on a windows xp sp3 nfts computer, I connect to the partition over a network share via smb. I run the file within the share so the file is never physically on the windows xp sp3 computer. In this situation will the virus infect the windows xp ntfs partition?
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Sep 20, 2010
I read some articles about viruses in Linux and about some antiviruses which work in Linux and delete Windows viruses but I still don't understand: is there any antivirus which specializes in Linux viruses? Even though there are very little of Linux viruses, I know.
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Jul 15, 2010
I have a dual boot computer. The WindowsXP "side" has been infected with a rootkit virus. So far UBUNTU has not been affected to my knowledge. I have not yet been able to remove the virus from the WindowsXP "side". I am thinking of deleting the NTFS partition and have the computer fully dedicated to UBUNTU.
Now for my question. Is there a possibility that the virus resides in the MBR and that I need to "rebuild" the MBR to actually remove the virus? Even more extreme, should I totally re-install UBUNTU in the name of safety and precaution.
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Aug 2, 2010
i was thinking that is there a way to check data flow for viruses? i mean if i set up calm av in my internet sharing server could it detect anything in incoming and outgoing data ?!!
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Sep 23, 2010
I've prepared a Samba fileserver at work without much too problems and I've prepared a batch file to mount it as z: letter on windows machine at startup.As a sad result the share gets filled with many viruses and became a vehicle of infection.
folder1 ----> folder2 and many other files and folders
folder1 has a condivision access read and write for everyone so I get no problems with passwords for all those who have access but i use ntfs security to do it read only (viruses act like if a pendrive is connected and mainly put infected files just in the "root" of it, in my case in folder 1) and then give everyone full control in folder2. I've been trying to understand how to do this but I'm quite new to linux and smb.conf really scared me. I've tried samba graphical tool which was a lot easier but I'm not able to achieve this kind of result: no need of user password for users to mount the share and no write possibilities in folder 1 and full control in folder 2.
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Mar 30, 2011
I have been told that some virus scanners for linux (including but not limited to AVG, Antivira, clamAV, others) are available to ubuntu. My question is which of these still CURRENTLY support detection of WINDOWS viruses in addition to linux viruses. I would like to boot the Ubuntu live jump drive I have to scan windows machines and at least detect viruses, dont really need to repair. who knows which virus scanners compatible with ubuntu that will detect windows viruses as well
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Feb 6, 2011
I have set up a virtual machine under VMware Player 3.1.2 in Debian. Operating system of this virtual machine is a Windows Server 2003. I would like to periodically test this Windows Server 2003 installation for viruses. Obvious solution would be to install an AV software under this Windows Server 2003 installation. However, I was wondering, is this possible to use NOD32 for Linux or clamav in order to test this Windows Server 2003 installation for viruses? Is NOD32 for Linux able to detect viruses inside the .vmdk file?
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Aug 25, 2010
Just a few words in the form of introduction.I have just purchased an older server to use on my home LAN.I understand that the use of Linux or Unix as an operating system will be effective in detering the gathering of viruses from the internet.I am totally unfamiliar with either system, but if this is the case, that's about to change.
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Feb 17, 2010
I know that ubuntu is highly resistant to windows based viruses but what if I open a attachment or click on a link within a email that is infected with a linux or platform agnostic virus?
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Sep 8, 2011
Since it makes Windows apps work there is a possibility that also its viruses will work. I searched and a few sites mentioned such things, but none confirmed this issue.
In Wikipedia, it said this: "Because of Wine's ability to run Windows binary code, concerns have been raised over native Windows viruses and malware affecting Unix-like operating systems. Wine can run much malware, but programs running in Wine are confined to the current user's privileges, restricting some undesirable consequences. This is one reason Wine should never be run as the superuser."
Here is the link.
As far as I know, I cannot install unless I'm a root user, and I keep my Terminal as a root user opened for hours. Also, if I were to install windows apps under Wine, I'll have to log in as a root!
So let me line the questions here:
1- Does Wine activate Windows viruses?
2- Can viruses run on their own while I log in as root in Terminal or while installing apps (whether under Wine or not)?
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Apr 13, 2011
this is the allert i got:Code:Summary:Your system may be seriously compromised! /usr/sbin/NetworkManager tried to loada kernel module.Detailed Description:SELinux has prevented NetworkManager from loading a kernel module. All confinedprograms that need to load kernel modules should have already had policy writtenfor them. If a compromised application tries to modify the kernel this AVC willbe generated. This is a serious issue.Your system may very well be compromised.Allowing Access:Contact your security administrator and report this issue.Additional Information:
Source Context system_u:system_r:NetworkManager_t:s0
Target Context system_u:system_r:NetworkManager_t:s0
Target Objects None [ capability ]
[code]....
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Jul 4, 2011
I thought ubuntu could not get viruses? Well I scanned with ClamTK and it found a virus.
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May 8, 2009
i still can't see quite well the security reason for not allowing one logging in as root on Fedora, but anyway...how to become the root on my system, Fedora 10, please?i did open a terminal and typed s - root then my password, now im the root, but only on the terminal, as CLI, but what if i want to change the munu.lst inside grub i.e.? and some other files or settings that there's no option to just type in the root password, how to overcome that please?
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Jan 17, 2010
Is the encrypt system during the install part of the SE Linux or is a whole other thing and another question maybe a sounding a little conspiracy but SE linux is made by the NSA can I trust SE linux and it not be a backdoor to my stuff
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Oct 4, 2010
My system went for three days w/o a software update... Is this normal(anyone experiencing this?)...?
It seems like to me.. Fedora 13 has a longer update interval than Fedora 12.. I remember back in Fedora 12 I get security updates like every other 12 hrs.. (I know as with security patches the less the "better"(in some way))..
But I am still concerned.. security updates has been slow for me.
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Jan 25, 2011
The infrastructure of the Fedora Project was compromised over the weekend and an account belonging to a Fedora contributor was taken over by an attacker. However, Fedora officials said they don't believe that the attacker was able to push any changes to the Fedora package system or make any actual changes to the infrastructure.
The attack appears to have targeted one specific user account, which had some high-value privileges. The attacker was able to compromise the account externally, and then had the ability to connect remotely to some Fedora systems. The attacker also changed the account's SSH key, Fedora officials said.
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Apr 17, 2011
I'm using FC14_64
How can I check if there are intruders or hackers in my system and how to boot the hell out of my system?
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Jun 23, 2009
I am interested in making the root file system is read-only. I've moved /var and /tmp file systems to another partitions. There are two files in the /etc directory that need to be writable.
These are:
I've moved this files to /var and linked it. I've added command to the /etc/rc.d/rc.local file:
That's it. Are there other solutions to make the root file system is read-only?
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Dec 6, 2009
i am afraid that some one palying in my fedora 12 system , " hacked " first i got this message when i log to my broadband internet provider
Quote: You have asked Firefox to connect securely to ******, but we can't confirm that your connection is secure. Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be verified What Should I Do?
If you usually connect to this site without problems, this error could mean that someone is trying to impersonate the site, and you shouldn't continue.
[Code]...
then when i log to yahoo mail , my system hang for a while then continue. how do i know that my system is secure ? what are the steps i should follow to secure my system ? i am still newbie and i dont have time to spend it in search in google or reading blogs
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Feb 2, 2010
For a month or so now, I have been enabling ssh and opening port 22. I cron'ed the start and stop commands to leave them open only a few hours a day. After a bit, I checked my logs to find that some IP or another was attempting to brute force my root account.
I took little real threat by the offense.
(1) my system does not allow root to login and
(2) it would cut them off sooner than later when my system issued the stop command.
fast forward
Today I log in to find that all of my log files, as viewed from the gnome log file viewer, were empty of entries from about noon yesterday and prior.
Though I haven't noticed anything at all out of the ordinary with my system, I would like to get more opinions on the matter. Would there be any conceivable way that this was an automatic system routine, a clean up action of something? Additionally, if I was indeed the victim of a hack, what can I do to further protect my system (keeping in mind that I do want to access my system via ssh from time to time)?
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Jan 6, 2011
I want encrypt my fedora file system.
How to i can encrypt ext3 or ext4 file system.
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Jul 11, 2009
I recently installed Fedora 11 64bit and I am curious about encrypting my entire file system for security purposes. I've been on Google for a while now and I keep finding info on how to encrypt a specific folder or home directories but nothing on the entire file system (or I'm missing something big here). It's hard for me to imagine that it isn't. If so, do I need to encrypt the partition my file system is on before installing it? What software should I use? There seems to be so many, it's difficult to keep them all straight.
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Sep 1, 2009
I switched over to Fedora a couple of days ago. I'm using the built-in firewall shipped with it but I can't find out how to enable logging of dropped packets. Among others I'd like to use psad that needs firewall logging. Is there an easy way to do this? I'm not an iptables "expert".
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Aug 25, 2010
Is there a way to to check if the system has the available security updates installed? Specifically, I am looking to do this programmatically.
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Aug 14, 2010
I suspect that I have viruses in my ubuntu environment.What to do now?
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Jan 21, 2009
I need a FREE solution that can image an entire Luks system encrypted volume and the rest of the used HDD, the MBR and /boot partition. Note: MBR and /boot are not encrypted. Note 2: I want to be able to restore entire drive from image with only a couple of steps. Note 3: Destination HDD space is a factor. Image file must be compressed and the image file must be around 40 to 50 GB or less. The smaller the image the better.
I have used clonezilla live cd before but not for encrypted volumes. I know you can install it in Linux. But, I don't know how to configure it after installation. I would be very happy if someone could tell me how to configure clonezilla in Fedora. How to guides are also welcome. I have one more question. If I image the encrypted volumes and all the stuff I mentioned above while logged in to Fedora, and I restore the drive from the image, will the recovered drive still be encrypted?
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Mar 28, 2010
I have ClamTk on Ubuntu 9.10 and I wonder if it REALLY works effectively against viruses.
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Mar 5, 2011
i know linux is very unlikely to get viruses and malware, but what about trojans?
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