A file system is a way of organizing information on a storage device like a computer hard drive.

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Best way to secure file removals in Windows remotely

I have Windows 2008 R2 box on colocation. I want to remove certain files with a high degree guarantee it cannot be recovered from physical HDD access. Could someone please explain what levels of ...
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2answers
1k views

Possible implementations of networked+encrypted filesystem

Is it possible to implement scheme where remote server just share its filesystem (or resizable container file in it) and it's locally encrypted and mounted? And what is best practical method? (On ...
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5answers
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Security purpose of asking admin password to mount partition on Linux

So I divided my 250GB laptop drive into 2 partitions and some swap. On the second partition which is an ext4 60GB partition I installed Fedora 17. On the other bigger NTFS partition I've got Win XP ...
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Is the mount manpage saying nosuid *is* secure, or is *not*?

I'm a bit confused about the description of nosuid in the mount manpage on this RedHat system I'm setting up: nosuid Do not allow set-user-identifier or set-group-identifier bits to take ...
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3answers
240 views

Could browsers improve security of stored passwords by using setuid?

On Unix-esque systems, Mozilla Firefox stores a users' preferences, web history and stored passwords in a set of files that are readible and writeable by that particular user. This makes sense: when ...
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5answers
636 views

How to restrict flash drives in Local Area Network

It is prohibited to use USB drives at our office, due to security reasons. But some people still use them to steal information. It is now a great risk factor at our office. Now we need to ensure any ...
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3answers
277 views

Why should every file have a user and a group?

I've been reading in most hardening guides for linux, that you should check for files and directories without valid user or valid group. What I can't find, is how this could be used for an attack, or ...
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136 views

Would this be plausible for a metamorphic virus? Not repeatedly infecting same system

Would this be plausible for a metamorphic virus? When a new generation (for lack of better word) is created it would hard code a random file name, that would be checked to see if the system was ...
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Repairing corrupt TrueCrypt volumes/disks?

(I'm asking this for a friend of mine as I'm trying to help him with this problem over remote desktop, so if any details are needed, just ask and I will get them). Two entire hard disks were encrypted ...
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3answers
627 views

How do polymorphic/metamorphic/self-encrypting/self-changing file infectors know if they have infected a file or not?

If a virus rewrites itself for each infection how would it know if it has infected a file or not? If it keeps infecting the same file soon the whole file structure will be corrupt. For example how ...
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Raw hard disk data extraction possible?

Suppose that the administrator's account is hacked. Then, can a hacker extract hard disk raw data (by raw data, I mean every raw data, not just files that can be read by a file system.)?
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Writing file shredder

I want to write a simple file shredder in c++, i.e. a program that deletes a file so that it is not recoverable. Would the following be a secure and correct way to do that? (1) Open the file with ...
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198 views

Theft of data via live boot disk

I have been working with live boot disks recently and I know that it gives you access to the computer's processing power, internet, and various other tasks without the hassle of a username/password. ...
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2answers
2k views

How to check for null byte injection in Java webapp

Looks like Null Byte Injection is possible in Java apps. see: Is null-byte injection possible in Java filenames? So how does one protect against it? Inspect all the bytes of the filename for a 0 ...
2
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3answers
253 views

How to protect data on your hard disk if it is in an unfriendly environment?

The essence of the problem as follows: There is a server located on the side of our company. There is a hardware client module, which is in a public place, which communicates with the server via a ...
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1answer
1k views

Hadoop security, isolation, and hardening

This is a multiple part question, which all really come back to the main question: How best to protect data in a Hadoop (wikipedia) cluster. (Current version, vanilla main-branch distro - ...
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2answers
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What are the dangers of storing webserver temp files in the /tmp/ folder?

I have configured my first publicly accessible nginx server. I have configured it to use a /tmp/nginx folder to store temp files. This includes the body of http requests, proxy files etc. The /tmp ...
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5answers
3k views

Is running an erase tool after an OS install sufficient to ensure no data from the old install is recoverable?

How secure do you consider this process? A drive has data from a previous OS installation. A new OS installation is made on the drive, and Heidi Eraser is run on free space. What are the chances ...
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4answers
441 views

What role does paging play in respect to security?

What role does paging play in respect to security? By paging I mean memory management technique of splitting file memory into pages I guess the question is does it make files more secure?
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3answers
2k views

How to recover securely deleted data

Since we all know files are recoverable with programs after being deleted from the recycling bin, everyone is told to do secure wipes by putting random data over the files you're deleting on the disk ...
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3answers
827 views

How effective is something like Deep Freeze against boot sector infections?

I work for an embedded system manufacturer and on our older generation systems, which are powered by Windows Embedded, a number of customers have been experiencing virus infections. Due to the real ...
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3answers
419 views

Secure cleaning of deleted files

So I know how to secure delete files. But at our company, we have a laptop which had many important documents, which now have been deleted, but not in a secure way. We can't perform a full format of ...
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6answers
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How secure is NTFS encryption?

How secure is the data in a encrypted NTFS folder on Windows (XP, 7)? (The encryption option under file|folder -> properties -> advanced -> encrypt.) If the user uses a decent password, can this ...
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3answers
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Can someone tell if you delete deleted files?

I am aware that to delete something completely we will have to use a program that over-writes the deleted file such that it is unrecoverable. Is there anyway to tell that this has happened? Or is the ...
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1answer
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Which Domain Administrator created file X on a Windows 2008 R2-based server?

Someone created a file (web.config) in a location that basically caused IIS to not work. Is there any way I can determine who created this file? The creator/owner says "Domain Administrators". ...
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Is there any asymmetrically encrypted file system?

Is there a file system providing a directory where everybody can write, but only the directory owner can read the files? In theory it could be done by encrypting using the public key while writing, ...
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2answers
338 views

Which access rights should be chosen for doku wiki?

I'm currently making my first experiences with a CMS called "DokuWiki" (Link). This CMS needs only PHP and writes the information to files (seems to be /dokuwiki/data/pages). At the moment I gave the ...
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5answers
2k views

Secure mount options + partitioning on Ubuntu

What is the best solution for mount options/partitioning when having e.g.: an Ubuntu minimal install (11.04) for Desktop use? e.g.: put /tmp on different partition to give it mount options like: ...
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149 views

Monitoring a specific application for creation or modification of files

I don't know if I'm looking for a file integrity monitoring software here. Basically let's say we have firefox or chromium, let's say the user is watching a youtube video, then we'll find that video ...
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2answers
2k views

Best way for a hacker to hide a file on Linux?

Suppose a hacker obtains a shell on my Linux host and wants to hide a file. What's the best way for him to do this? You may assume unprivileged or root access. My thoughts are Use a .file ...
5
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1answer
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Windows mandatory access control: How to remove “mandatory level” label from the file?

1) How to remove "mandatory level" label from the file? I have two files, for first icalcs return Mandatory Label\Medium Mandatory Level:(NW) for second icalcs doesn't return anything (that means ...
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3answers
7k views

Prevent acccess to the C drive on Windows systems

Is it possible to prevent regular users from accessing the C drive via Windows Explorer? they should be allowed to execute certain programs. This is to ensure that employees cannot steal or copy out ...
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3answers
742 views

What prevents this exploit from working (unix SUID)?

If I have a user on a unix system where Im allowed to create new files, what prevents me from downloading an executable file onto that system which is already SUID'ed to root on a different system? ...
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320 views

Are NTFS Alternate File Streams considered a security risk in your organisation; how is it mitigated?

Alternate File Streams allows a user to embed hidden content within any NTFS file. That file can be a TXT file, or MOV for example. Some may consider this a form of steganography, and therefore the ...