Security :: Viruses And The Master Boot Record?
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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Jul 1, 2010
Windows' Master Boot Record seems to be damaged on my dual-boot.Here are the details.
Boot Info Script 0.55 dated February 15th, 2010
============================= Boot Info Summary: ==============================
=> HP/Gateway is installed in the MBR of /dev/sda
[code].....
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Nov 27, 2010
I think I managed to corrupt my master boot record, or have a very intractable problem with Grub.
I'm not sure how I did this, but my desktop will boot Ubuntu fine from a USB, but every time I try to install it, the install seems to go fine, but when I finish the install and the machine tries to boot the OS from it's hard drive, it does not work. The monitor does not get a signal and it just goes to sleep.
I tried posting here to resolve the problem before, tried everything on this thread: [URL]
But nothing worked.
I have even tried running the system from a USB, running a "shred" command for the hard drive and then reinstalling - my theory was that the shred command would destroy all the data on the hard drive anyway, and allow a "clean" install from whatever was corrupt on it, but no luck - when I installed Ubuntu on the hard drive, same problem.
I'm not clear where the problem lies now, I'm assuming there is something up with it's master boot record, but there are no partitions on it's hard drive and I started with a completely blank, unformatted drive.
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Dec 15, 2009
I just installed SuSE 11.2 on top of where 11.1 used to be on my hard drive. Acronis Operating System Manager will let me boot into XP Pro but it tells me it cannot find SuSE in the master boot record. If I repair the master boot record in SuSE, XP Pro disappears. What do I do?
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Jun 7, 2010
I have a Windows XP/Windows 7 dual boot system. My problem: [URL]. I follow these instructions to the letter, the live "CD" works fine - using a USB stick, I do not have a DVD drive, in- or external -. When I try to install Ubuntu from the live system, it corrupts my master boot record, I get the Error: No Such Device #####################. After I fixed this I tried to install Ubuntu under windows, using the same usb's wubi installer. The install completes, I reboot, and after selecting Ubuntu in my boot menu, I get that likewise well known error with wubildr.mbr [URL]
Rebuilding the USB stick doesn't make any difference, it behaves the same way. The wubi installer has the very annoying habit of downloading the iso during the installation procedure every time, I don't know why I can't just select the iso downloaded in the first step of the above link. This way I cannot check any md5 because I have no idea where it downloads the iso. What should I do to get Ubuntu working? Reinstalling any of my Windows systems is not an option, it is every time like gambling, I am using the same installation files, but sometimes the result is just not the same.
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Mar 9, 2011
I have a 1TB hard drive which is formatted with FAT32. Attempting to make a new partition I clicked the format drive button in Disc Utility. I chose Master Boot Record and something was written to the drive. So now I can't mount the drive and Disc Utility says that there aren't any partitions. I don't think this can be true because I had 200 GB of data on the drive and it would have taken longer to delete all that. At least I think...
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Nov 29, 2010
Is there a way to re-install grub on the master boot record of a hard disk using a live cd?If so will i have to configure it?I'm trying to install a linux distro on my ao751h(with poulsbo ) but i after installing it i can't boot.I get an error 15 or a flashing underscore.I have already tried ubuntu,debian,mint and slackware(LILO isn't compatible with poulsbo).Also,does anybody experience problems with the ubuntu 10.04 and 10.10 installers or is it only me?when i choose the language and keyboard settings the installation stop as it is and i get a crash report.
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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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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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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 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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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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Sep 17, 2010
Can I set a master password for the system and I am the main user and have my password and then set password for all the other user
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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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Dec 5, 2010
My master password is not saving any passwords in Firefox. I use this also in Windows XP, and all my passwords get saved. Furthermore, is this even a good idea to begin with? Can the passwords be stolen easily?
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Jan 21, 2010
I just tried out setting a master password for Firefox saved passwords and compared the old and new (before and after setting the master password) signons.sqlite files. Although passwords were not stored in plain text in either of the files, I did notice that the files were exactly the same. Am I wrong in assuming that setting the master password did not encrypt anything at all, or am I simply looking at the wrong file?
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Nov 13, 2009
I'm managing a residential network. Each flat is its own subnet, and can only communicate with the other flats through a router (i.e. no broadcast). 95% of these 300 subnets only contains windows computers (from lambda users).
My final goal is to be able to browse the entire network from any computer.
I set up a samba server acting as a wins server, and every computer is aware of it because it is registered in the dhcp. So name resolution is working fine for everyone.
The same samba server is set to be the "Domain master browser":
workgroup = WORKGROUP
wins support = yes
prefered master = yes
local master = yes
domain master = yes
os level = 65
When I browse the network (using "net view" or "browstat view"), I can only see the servers which are in the same subnet as the domain master browser.
Now, when in a subnet the computers arrange themselves to find a "local master browser", the only visible computers are the one in that subnet.
What I don't understand is why all the local masters don't synchronize their lists with the domain master.
So, to sum up, every subnet get the following behaviour:
-if a local master is elected, the only visible computers are the one in the same subnet.
-if no local master is elected, the only visible computers are the one in the subnet of the domain master.
-if I add another samba, configured as a local master winning all elections, then the magic is working and the lists are synchronized.
What is expected:
-every computer can see all the computer from all the subnets.
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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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Jun 20, 2010
Ive being digging around the net for some clarification about the Off-The-Record plugin for Pigdin (and other IM's). Basically i want to know if it uses the SHA-1 or SHA-2 hash function. Some might say im wearing my tin foil hat but the SHA-1 was cracked in 2005 and as far as i know SHA 2 is much more secure.
Wikipedia states it's SHA 1 and the authors of the OTR plugin mention both SHA-1 and SHA-2 in their documentation, and i couldnt find an active pidgin forum (could only find the archived pigdin forums on sourgeforge)
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Jul 29, 2010
In our organization we use Static IP addressing scheme(Some departments have DHCP which is not related to this thread). We use Squid as proxy.
We assign each machine its IP address and make entry in our TinyDNS database, and provide those details to users, which they manually enter in their config and then access the network. We assign different range of IPs to different departments. This we consider as the "proper way" for our organization.
But we have found that lot many users are simply guessing some IPs and using them without having any entry in our DNS record. Though this works for some, most of the time we end up having IP conflicts and disorganization in our organizational allocation policy.
So, my question is, How do I block the specific IPs whose entry is not explicitly defined in our DNS record. In other word if the IP 192.168.20.15(lets say he is jack.ourorganization.com) is defined in our DNS, we should allow access... where as if IP 192.168.20.16(this does not translate to any user as it is not defined in our DNS) is not defined in our DNS we should not allow it access to our network.
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Mar 23, 2010
I want to back up the master boot on my hard drive, in case something screws it up. What software do you recommend for this?
My first idea is to boot from a Linux CD and dd the first 512 bytes of /dev/sda, and dd it back to recover. Will this solution work, and is it safe?
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Nov 10, 2010
I'm posting an E-Mail I sent to Pidgin Support, which didn't get answered. I'm doing this because I believe it is a general SSL problem. I've even tried a different chat client (Instantbird) - same error message. Since a week or so I'm not able to securely login to ICQ any longer with one of my accounts. Only if I disable "Use SLL" in the advanced settings, it works. With SSL I get the error message "Unable to connect to BOS server: SSL Handshake Failed". In the debug window the reason for the failure is "A record packet with illegal version was received". If I enable the setting "Use clientLogin", I get a different error: "Received invalid data on connection with server".
I get this error for all of my ICQ accounts if I enable this, but the other ones work just fine using only "Use SLL". I can login to the ICQ website with the "bad" account too, the settings are exactly the same for all 3 accounts. I was using Pidgin 2.7.3 when this happened first, upgraded to 2.7.5, but no change. I'm running RHEL 5.5 x86_64. I've attached the Pidgin debug messages for the "bad" case of the not working account and for the "good" case of one of the working accounts. I've tried a lot of things, like deleting the account and adding it again. I deleted the cached certificates. I changed the password on the ICQ website.
From the attachment I'm only pasting the most important part - the error message:
(20:27:14) gnutls: Starting handshake with bos.oscar.aol.com
(20:27:14) gnutls: Handshake failed. Error A record packet with illegal version was received.
(20:27:14) oscar: unable to connect to FLAP server of type 0x0002
(20:27:14) connection: Connection error on 0x9bf19f0 (reason: 0 description: Unable to connect to BOS server: SSL Handshake Failed)
I doesn't get into my head why 2 accounts work perfectly, but one doesn't. The login-server is exactly the same, so also the used certificate should be the same.
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Mar 31, 2010
I have a load balancer with 2 web servers behind it. The web servers rsync with cloud storage to update their apache directories 1 time every hour. Apache is just running php pages that pull/push data to a DB so they dont need to be updated that often. However I need to figure out how to implement a Master/Master MySQL setup to have my web servers point to for the PHP stuff. I need to implement it without having a single point of failure. The Load balancers are useless for failover as they only detect availability based on Ping request. So putting a master/master setup behind a Load Balancer is out. what is the best way to setup the master/master mysql in a HA setup without the use of a load balancer provided by the host?
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Jun 2, 2010
Upgraded to 10.04 and now ubuntu will not load and we are sent to a grub shell. Tried reinstalling grub without success. can't find /boot/grub/stage1.can't reinstall system from CD.Partitioner fails with?
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Nov 17, 2010
I run a compute cluster with only a few users. Occasionally a user will accidently run a job on the master node that runs out RAM/swaps then hanges up for a while.In /etc/security/limits.conf I have set memlock to 7.5GB (master has 8GB RAM) and maybe that is what lets the machine come back rather than hanging completely? Is this the right setting to physocally limit a single user from asking for more RAM than the system has and bringing down the system? Should I set this to 2GB or so or is there something else I can do??
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Jan 5, 2010
I have been trying with several different distributions and finally tried with Ubuntu. The iso matched up with the hashes but the boot record is still not being found...are there tips other than burning slower to ensure a good burn?
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Oct 27, 2010
If I have a HDD with 3 particions, I have 1 MBR at the begining of the HDD, and 3 VBR (volume boot record). One VBR for each partition in the begining of each partition. But what I dont understund is if first VBR in the first partition (512 bytes) are the same 512 bytes in MBR?
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Mar 21, 2011
I've been using squeeze for a year or two now, on a PC dual booting with windows xp. Not long ago I thought that, as it's now become the stable release version, I'd do a fresh install, which I've been trying to do with the first two dvds. The installation proceeds as expected, up to and including setting grub. However, although grub saysthat it has detected windows xp, and I tell it to set up the dual boot, the computer on reboot goes straight into windows xp, with no on-scrteen option shown for choosing debian.
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