The operating system is the software component that provides abstraction of physical hardware, and provides a generalized model for application software to execute without the need for specific hardware knowledge. Questions on the topic of operating system security should use this tag; you may also ...

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Can a detached hard disk reveal the system information of machine from which the hard disk is detached?

Can an internal hard disk (on which Ubuntu or any other OS is installed) that I detached from the PC or laptop (Keeping the OS as it is) and connected to some other PC or machine reveal the info of ...
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387 views

Preventing exploits like ROP and Return-to-libc in modern Operating systems

As I was reading about the advanced exploits such as Return Oriented Programming (ROP), Retun-to-libc, etc., I came across many defenses to these attacks including techniques like ASLR, kBouncer, ROP ...
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62 views

Is there a way to create separate environments on your computer with no way of detection?

I would like to know if there is a way to create two different systems/environments on your PC (Windows OS) that you will enter each by different username and password. When someone enters your ...
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112 views

Where does the list of trusted content authorities come from when using a web browser?

I was asked "how do browsers know whether or not to trust the certificate from the server it's connecting to" and thought it was a pretty good question. After doing some googling I found two answers: ...
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265 views

Minimize risk with Windows 2003 end of life

The company I’m at currently has over 500 Windows 2003 servers remaining globally in production and even though they have a refresh plan they are working through, they are not going to be done anytime ...
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1answer
53 views

Could see image of previous session after restarting and switching OS

(I have GNU/Linux and Microsoft Windows installed.) I played a game on Microsoft Windows, quit the game, restarted the PC, and selected GNU/Linux. On the login screen, the background image was ...
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77 views

Is Qubes OS more secure than running a set of activity related VMs?

I'd like to skip the argument about Linux being more secure than Windows, and purely focus on the security boundaries between Host OS and VMs. Is Qubes OS theoretically more secure than say - Windows ...
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281 views

What negotiates SSL ciphers? [duplicate]

In light of the recent FREAK vulnerability I am trying to get a hold on what ciphers are being used by inbound connections. I have FTP tracing on which is giving me which ciphers are being negotiated ...
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137 views

Is it safe to create live usb on an infected system?

I am using Ubuntu 13.10. If my laptop is infected with malware, can I get rid of it by creating a live usb on it and using that live usb format and re-install the ubuntu ? I mean is it possible that ...
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2k views

Basic Security Knowledge [closed]

Perhaps I am being both naive and overly ambitious in my first post but I have a huge interest in learning about network and system security and am at a loss as to where to begin. I realize that stack ...
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3answers
1k views

Debugging and DLL-Injection

Hi, I am currently reading Gray Hat Python to learn about Debugging and various interesting techniques for binary analysis. So far I have learned an amazing amount of stuff (just read about DLL-...
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Different Security Issues Depending on OS? [closed]

I'm interested in learning more about OS specific security issues if there are any. I'm very new to this topic but I want to learn more about if there are specific security vulnerabilities associated ...
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1answer
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Are there any mechanisms to verify the correctness of a burned disc?

I was recently recommended a specific smartcard over on HardwareRecs.SE. As part of this, the answerer (our ursine overlord) stated that the cards in question don't offer a means to securely backup ...
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Does OpenBSD's security protect against identical vulns in other OSs?

I have been reading about OpenBSD and its more secure design. I was wondering therefore about the difference this makes to applications which can run on any number of OS. Lets take the example of a ...
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1answer
97 views

Why doesn't the OS authenticate itself to me?

Sometimes it occurs to me, when doing something like a brew install, or really anything on a CLI (though I suppose this is also true of GUIs to a marginally lesser extent) that prompts me for a ...
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1answer
516 views

What's the difference between Systems security and Information Security? [closed]

I'm trying to differentiate between the the three. What is Systems Security? What is Information Security? What's the difference between Systems Security and Information Security? I'm trying to ...
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2answers
520 views

How to hide or obfuscate the type of OS?

I get the OS type of a remote host by: connecting to an open port (telnet <host> 22); using Nmap (nmap -A <host>). What are techniques and how to hide or change the information about ...
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93 views

Automatic vs Manual

When it comes to technologies that directly affect information security, how do you determine when it is better to use an automatic option instead of a manual option, and vice versa? I already feel ...
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1answer
1k views

Spoofing OS during browsing

I am using http://www.mybrowserinfo.com/ to gather some info about me while browsing. I want to change my OS to appear that its a Windows Xp machine.(No VM solutions please:D) If you have any ...
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Pentesting an ATM OS upgraded from Windows XP to Windows 7

How to approach penetration testing of a ATM OS that was upgraded from Windows XP to Windows 7? From what I gather, the testing flow should be as follows: Architectural Review Pentesting OS and ...
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75 views

Multiple Independent level of security vs Multi-level security

I am looking for a way to isolate two different networks from each other. Suppose we have 2 different network (public and private). I am looking for a way to connect to these two network via single ...
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91 views

DLL preloading attack - are IAT libraries affected too?

I'm about to distribute a dll library (there's also a linux version) to my users but I'm afraid of dll preloading attacks (i.e. someone substituting its malicious dll to get called by mine and gain ...
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3answers
58 views

Securing online SQL database and server [closed]

I am trying to build a big project but lack the knowledge of security of servers and SQL. So, please help me by telling what necessary steps should i take. Block all remote access :- I have heard ...
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How could one say that older operating systems are more vulnerable?

Experiment conducted by me in Windows using Virtual Machine: I have collected all rogue security software that target a range of Windows versions and several latest malware (no older than a month) ...
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Access to system32 [closed]

Is there a way anyone can access the system32 folder on Windows without being logged in? If so, how would he do that and how to prevent it.
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218 views

Are the Microsoft Windows images found on the internet safe?

Microsoft has stopped offering the Windows images for download. It is now only possible to get the image if one has a key of a retail version of the corresponding OS. The question is now, whether the ...
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275 views

Operating system scanner

I am confused about Operating Systems scanner vs Network Scanner. Usually a network scanner such as Nessus can already check for operating systems vulnerability. So what does an operating system ...
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213 views

the dangers of internet forums - what is FUD, what is not

I just visited a forum and a member knew what OS I was running without me saying anything (a not TOO common distro of linux). Now I'm not sure how he exactly he might have done it, or what information ...
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Isolate dual system

Say I have a computer with 2 operating systems: one secure, one... not so much. Now say I want to use the insecure system to do some work I can't do on the secure one. What is the best way to isolate ...
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1answer
407 views

Have there been any instances of malware in custom ROMs for Android?

Have there been any instances of malware or spyware packaged in custom ROMs, for example a malicious email app pre-installed that records your server IMAP username and password and forwards it to a ...
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VM security, how to access main OS

Is there any way for me to access the main computer if the VM has been infected? Let's say that I am running Debian or ubuntu in a VM and the main computer uses Windows (or other way around just so ...
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3answers
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Is there a way to make changes to a virtual machine, test it out, and automatically make same changes to normal machine?

Is there a way to install programs and make changes to a virtual machine and if they work ok have them applied to the "actual" machine? For example in this question when fiasco_averted says "...only ...
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1answer
235 views

What registry windows keys malwares target often?

I wonder what are the main registry windows keys malware target often ? I would love to code a program that will check the state of those windows registry keys for eventual modifications by malware.
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918 views

How to identify a specific operating system with port scans?

According to the implementation of the TCP/IP stack an attacker is able to identify which operating system is running on a network device. Is there any paper or the like according on this topic?
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60 views

Loading of fake Library attack

Let's supose i have an executable file a.exe and it uses stdlib for some operations. Let's suppose an attacker changes the system stdlib to a "malicious" stdlib. The implications of this might be ...
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Mac OS X vulnerabilities and not having the need for an antivirus?

I have just read news about Mac OS X vulnerabilities and wondered why would people say that you don't need an antivirus if you are using a Mac? There are vulnerabilities in other operating systems ...
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157 views

Isolated safe anonymous OS

I wonder about a setup where I can have a primary OS on my Laptop, but keep a second OS that is safe, anonymous, persistent and isolated (for sensivite data that may communicate with the outside world)...
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1answer
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Do I need to change my host OS to something like Tails if I already have Tails running in a VM if I want to be protected on the interenet?

First let me say sorry if I sound like a script kitty, because I am. Now on to my question. So I want to be protected on the internet when I go on the deep web, do banking etc. I use Tails to protect ...
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1answer
52 views

Is there a solution for runing processes in encrypted mode on runtime?

Is there any solution for securely running encrypted processes on an untrusted machine over the WAN? In public clouding, you can split your processes and send process request over the WAN, but you ...
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92 views

Is there a way to prevent software from accessing hardware IDs?

I think this is related to this question, but I would like to know if there's also a way to prevent "third party" applications from seeing hardware IDs (motherboard, hard disks, and others), or giving ...
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1answer
166 views

Do the Linux binary blobs contain any intentional security holes?

This question covers the risks of accepting Binary blobs in one's distribution. This may be a very paranoid conspiracy question. But considering all the topics regarding the NSA in 2013 one cannot ...
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26 views

Privilege escalation if the privileged ID is known

If I know the ID of a group, whose privilege is higher than mine, is it possible for me to execute programs using that group ID? If so, how do I do it? If not, why not? Will appreciate all answers.
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474 views

How is Thread local storage used by malware/Virus?

I have been told that code in TLS is run before the entry point of an exe is reached ,so if one puts a breakpoint on this TLS address he/she could debug the behavior of the virus.Can Fiber local ...
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1answer
93 views

Can benign software modify Widnows DLL files?

On Windows (XP, 7, 8, NT ...): can .dll files be modified (in any manner) by benign programs/software already installed/running on the computer ?
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Can a drive-by download attack crash the OS?

Are there cases where a serious drive-by download attack could crash the operating system or the browser ?
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81 views

access control-intersection of subjects’ permissions

In the book named "operating system security", I read this paragraph: "Protection domains can also be constructed from an intersection of the associated subjects (e.g., Windows 2000 Restricted ...
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25 views

Can the instruction set be targeted directly?

Can malware directly manipulate the instruction set or is it restricted to the functions/services of the os/kernel?
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162 views

Block OS fingerprinting without using iptables?

I have a Linux machine connected to a Windows 98 PC on port 104. Now I want to block the OS fingerprinting using nmap for the windows 98 PC. I tried using iptables (blocking that particular port) but ...
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1answer
45 views

Who is the Mandatory Access Control Administrator

Would a mandatory access control implementation administered by a 'normal' user be discretionary since the user could change permissions as he sees fit? And if so, wouldn't root as a MAC admin, being ...
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Virtual Machine Introspection for VirtualBox

Is possible use Virtual Machine Introspection (VMI) for monitoring system calls and internal system operations in Oracle VirtualBox machine (if I use Linux as quest system) in this time? I have read ...