IT Security Stack Exchange
IT Security Stack Exchange

Questions tagged [file-system]

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

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 security (NTFS-wise) can be achieved with different…
Boppity Bop
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Unusual file permissions on WordPress websites

I've been asked by a customer of mine, to manage a few hundred WordPress sites. Doing an initial security assessment, I've found that every site (350 sites) has unusual file permissions on every php file (755) that means executable bit on all groups…
Roberto Jobet
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Drive with deniable encryption and multiple independent file systems

So I read this question about deniable encryption but it left me with a few questions. The first answer describes how you could hide one file system on a drive. The process goes like this: Fill the drive with random data Select a random offset and…
Cookie04
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Question regarding data encryption/decryption and sharing said keys with third party's

At work we have a pretty complex problem(for me at least) and I have no idea what a fitting solution would be. To give a bit of context, the company I work for is a data processor/provider for big corporations that need sensitive user data such as;…
Devchn
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Is there any security issue while two different process using different hard link of same file?

To reduce disk space I have planned to use a hard link instead of full copy, Is there any security issue while two different processes using different hard links of the same executable file as base?
Karthik Nedunchezhiyan
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How files are allocated to memory in NTFS?

If a file is deleted in memory which is using NTFS and after that, I copied a new file, then where is the new file is allocated in memory? Is the file allocated in the deleted memory space or it is allocated randomly? note: both the deleted file and…
Rohith Jukanti
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Best Practices for exporting sensitive database data and transforming it whilist keeping it encrypted?

Say one has to export database data to use in another tool, such as an Excel Spreadsheet or for use as a csv file with some other program. There's a problem with this, and that's that it ends up in an unencrypted form on the disk, where it can be…
leeand00
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Using the same passphrase for files and filenames with filesystem-level encryption such as eCryptfs

In filesystem-level encryption schemes where files are encrypted and stored individually, filenames may or may not be encrypted. eCryptfs allows to encrypt filenames with a different key than the one used to encrypt files. Are there any security…
Arcturus B
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How secure is it to store passwords in a non-accessible file?

So, I was thinking about workarounds for saving passwords in text files (just because I'm curious), and I thought, what if I saved my file somewhere that is non-accessible? My server has a public_html folder where all of the code lies, however, I…
Joshua Sparkel
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Is shred -n1 /dev/sda demonstrably worse than Bleachbit?

Given an ext4 harddrive (not SSD) with no files, is running sudo shred -n1 /dev/sda # one pass, no zeroes, over whole drive demonstrably less reliable than using Bleachbit's "Wipe free disk space" tool on the same location? (As far as I can see…
lofidevops
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How to completely remove all traces of a file on Linux? (Overriding everything if needed)

How can I delete a file and completely remove it from the system FOREVER. I does have in mind that it's needed to override it. But how can I do that?
user141427
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How can I capture files malware creates and then deletes?

Malware on Windows often creates and deletes files. How can I capture the files it creates if it deletes them too quickly to copy?
Mars
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Does aslr definitely end the possibility of code execution in the case of filesystems heap overflows?

Local only Filesystems (like ntfs or btrfs) consists of many data structures that require very complex code for parsing them. So, such filesystems if implemented in user space can suffer of buffer overflows vulnerabilities like many parser. In that…
user2284570
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How did stuxnet hid it's files after the infection?

I've noticed that when ~WTR4141.tmp is loaded, it doesn't set hidden file attributes to .lnk files and on the other .tmp rootkit file of the Stuxnet bundle. I've seen that these are all the possible file attributes on Windows: Let- Bit ter …
Zlatan Omerović
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Database was Deleted, Suspected Tampering

So basically at the beginning of the year a database of intellectual property (IP) disappeared at the close of a falling out between some upper-level employees and the executive staff at my company. Why there was no backup, or why no one suspected…
CKM
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