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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1answer
105 views

Possible ways to test security for Windows Phone 7 or iOS devices [closed]

I'm trying to test the security features of different types of OSs available, and I decided to narrow this down to the Windows Phone 7 and iOS operating systems. I will be testing both my Nokia 800 ...
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3answers
1k views

Are file permissions set in Unix/Linux effective in Windows or Any other OS?

Consider some files and folder in Unix/Linux OS which are configured for only read access by root, if the hard drive stolen, and used in Windows Environment, are these permissions are still effective? ...
4
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4answers
1k views

Is online banking more secure on iOS than a desktop computer?

Does Apple's iOS provide a more secure environment for online commerce (banking or shopping) than Windows or Mac OS X? Since the only software that can run on iOS must be vetted by Apple, the ...
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3answers
428 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 ...
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2answers
522 views

ASLR and how a program can actually call its functions

I'm studying protection techniques and I've got a doubt about how ASLR works for a program in a Windows environment. As far as I know ASLR works by randomizing part of the imagebase address when ...
4
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2answers
547 views

How is hibernation supported, on machines with UEFI Secure Boot?

I've been learning about UEFI Secure Boot, which attempts to prevent "bootkits" by locking down the boot process so that only signed bootloaders and kernels can be loaded. Hibernation seems like a ...
4
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1answer
479 views

How does UEFI Secure Boot prevent “evil twin” spoofing attacks?

I've been learning about UEFI Secure Boot. It is designed to prevent malware from infecting the boot process and overwriting the bootloader. It has hardware-level protections to ensure that only a ...
257
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13answers
52k views

Are passwords stored in memory safe?

I just realized that, in any language, when you save a password in a variable, it is stored as plain text in the memory. I think the OS does its job and forbids processes from accessing each other's ...
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3answers
76 views

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 ...
5
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6answers
203 views

Is it useful to determine the name of the server software while doing a penetration test?

Getting the name of the server software through netcat or curl or any other method, is really useful? I mean, OS fingerprinting is useful in order to tailor an attack. For example with regard to OS ...
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2answers
236 views

What technologies are recommended for E-banking? [closed]

If a Linux user need use his bank account from Internet, then what technologies and procedures should use? Is better to use the Guest Account (if exist) of the OS, or an Administrator Account? What ...
4
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1answer
193 views

iPad as a secure access terminal

I administer a number of linux servers (hosted on EC2 and linode) which provide VPN termination for thirty-odd users. I'm considering ditching my Macbook running OSX / Ubuntu in favour of setting up a ...
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3answers
1k views

Can you extract memory contents from a hibernated Windows machine?

In a recent discussion about hardware hacks, attacks surrounding Windows hibernate popped up. I am not entirely convinced that it would be viable to get stuff out of the memory saved to disk. When ...
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1answer
572 views

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 ...
84
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13answers
7k views

Why do we lock our computers?

It's common knowledge that if somebody has physical access to your machine they can do whatever they want with it1. So why do we always lock our computers? If somebody has physical access to my ...
5
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1answer
109 views

OpenBSD, fbtab and X Window [closed]

The afterboot(8) man page of OpenBSD advises "You might wish to tighten up security more by editing /etc/fbtab as when installing X. " I would like to know what entries in /etc/fbtab would make sense ...
3
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1answer
402 views

Does setting a firmware password add security if FileVault 2 is enabled?

On an up-to-date OS X computer with FileVault 2 (whole-disk encryption, minus the recovery partition), is any security gained by setting a firmware password, as well?
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1answer
504 views

What kind of hashing is generally used in log-in modules?

Do operating systems hash the log-in password? What hash function is used in Windows XP, 7, 8,Linux Ubuntu, Debian, MAC Lion OS X ,...? Where should I look to know these security considerations of an ...
2
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2answers
231 views

Security model for datacenters

I have several datacentres and now I want to plan security for it, so it's resilient to external attacks. I need to make a security model which will cover my web servers, auth servers, log servers, ...
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2answers
1k views

SUN Remote Procedure Call Port 111 [closed]

I have found on my machine port 111 is open. This is listed as RPC. I understand there are possible attacks on this port. How can my machine be attacked if port 111 is open? How can I secure this ...
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5answers
4k views

Why does the government/military not use special operating systems?

Why does military and government not use special operating systems? I mean, if they do not use generic operating system based on Windows, Linux and Mac and create their own operating system, they will ...
3
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4answers
2k views

Is dual-booting an OS more or less secure than running a virtual machine?

I run two operating systems on two separate disk partitions on the same physical machine (a modern MacBook Pro). In order to isolate them from each other, I've taken the following steps: Configured ...
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1answer
387 views

Top Ten Security Weaknesses of a Networked Computer [closed]

I'm looking for a list of what you would consider to be the Top Ten Security Weaknesses of a Networked Computer, can be Windows or Linux specific but ones that apply to both are better. I'm not as ...
47
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9answers
7k views

Risks of giving developers admin rights to their own PCs

I need to convince my internal IT department to give my new team of developers admin rights to our own PCs. They seem to think this will create some security risk to the network. Can anyone explain ...
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5answers
8k views

Is my computer at risk of being hacked when using public Wi-Fi?

I'm sitting at a cafe, using their public Wi-Fi. I don't go on sensitive sites; I basically go to a music site and listen to a live stream, for which there's no login. I don't check my email or visit ...
16
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1answer
4k views

Mac OS X from an IT Security Practitioners' Perspective?

What does the Mac OS X offer that it has been recently attracting users with IT security focus? There are sites that specifically focus on "hacking" with OSX, such as machacking.net. Defcon has an ...
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6answers
205 views

What are possible approaches and arguments for securing corporate IT systems with most computers being portable?

I was employed as the only system administrator by a company where half of computers are portable ones being taken away for work at home, business trips, visits to clients, etc. having access to ...
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2answers
452 views

Added value of Windows Server 2008 over 2003 in terms of security

What is the added value of a Windows 2008 Server over Windows 2003 in terms of security? Does Windows Server 2008 has enhanced/new security features compared to 2003?
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1answer
294 views

If password is changed on Active Directory, can I ensure that PC must be restarted before logon with new password

Basically, if I have a Windows computer connected to a domain, how can I ensure that if the password is changed on Active Directory that the computer must be restarted before the new password takes ...
4
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1answer
787 views

Why does Windows 7 require a password hint during setup?

Correct me if I am wrong, but I think Windows 7 is the only operating system out there that requires a hint for the first user created on the system (have not had a chance to check out Windows 8 ...
3
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1answer
730 views

How does OS detection work in practice?

I was wondering how OS detection really works on Nmap. I know it is about to send different tcp probes to see how the target machine responds to them. But what kind of probes would distinguish a ...
4
votes
2answers
264 views

Securing data on laptop's hdd

I was wondering which is the best way to secure/encrypt data in the hard disk on a laptop that runs Ubuntu Oneiric? Setting LVM encryption? I am mostly concerned about having my laptop lost or what ...
7
votes
3answers
470 views

How to gain a shell?

I'm doing an exercise (exploit-exercises.com) that requires me to gain access to a shell running as another user. My question is this: I can create application that is guaranteed to be run by the ...
3
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2answers
787 views

Backtrack Footprints

I have been hired to to penetration assessment (scanning,testing and so on) ( I am new to the industry and learned through Offsec pentration training.) While training, I have been doing most of my ...
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2answers
366 views

Apple Mac Security - What do I need to know?

As I've been working on Windows machines most of my life I know most of the best practices and apps to keep them secure. When it comes to security on Apple macs I'm clueless as to where to start.
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2answers
3k views

How expensive is it to guess a 15 character password, and should I be worried?

I'm currently using AES encryption (at home) on GNU/Linux (one of LUKS AES-256 variants with xts) and on Windows 7 (Truecrypt) with a 15 characters password (alphanumeric lowercase only plus _). ...
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5answers
2k views

How can I remotely wipe the contents of a Linux Laptop if its been stolen?

I am currently investigating using Linux Laptops for my development team. We currently run Windows. The one advantage that keeps coming up for Windows over Linux from a system administration / ...
4
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2answers
591 views

Blackberry QNX / Playbook encryption details

Now that Blackberry received FIPS 140-2 certification for one of it's QNX devices, does anyone have technical specifics on how data is encrypted on both mobile phones or the Playbook tablet? I'm ...
2
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1answer
318 views

Can UNIX Domain Sockets be locked by user ID?

If I created a folder /tmp/me with permissions 700, and started a process under me that starts a listen socket under /tmp/me/socket. I currently assume that a connection to that socket originated ...
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3answers
744 views

How to find the OS of the target machine

I am new to this field. Currently I am using Linux OS and my question is how can I find the OS of another machine to which I do not have a direct access. I am interested in any possibilities which ...
2
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1answer
128 views

Are auto-mounting hard drives a security issue?

Why are hard drives mounted by default in Windows OS, while they aren't in Linux OS? Is that a security issue? If your computer was hacked, can unmounted drives be considered clean?
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2answers
3k views

Where can I download vulnerable Windows OS images to practice penetration testing?

My objective is to learn and practice all the vulnerabilities and their exploitation on vulnerable OS.
6
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3answers
618 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 ...
4
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2answers
397 views

What is the background of the Reference Counter Overflow in Microsoft TCP/IP (MS11-083)?

How unique is this bug? Is there a more sophisticated and well-studied attempt behind? Is it accidence? The article below says "continouos stream to UDP". What stream? Just an hour stream of zeros? ...
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2answers
554 views

Can a virtual machine program view a host machine's connections?

I don't really know anything about computers. I need to run a virtual Windows machine inside an Ubuntu system. My current setup uses a stripped down version of Windows XP on VirtualBox. I intend to ...
5
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4answers
5k views

Monitoring system calls (in a reliable and secure way)

It there a reliable method of “monitoring” system calls under Linux? There is strace for example to monitor system calls and signals. Is there a way for a process to dodge out of strace? If yes, is ...
4
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3answers
859 views

Wrapping system call (in reliable and secure way)

It there reliable method of "wrapping" system calls under Linux ? (Like LD_PRELOAD for wrapping shared library function calls.) Is there reliable, secure method of "wrapping" system calls (and, maybe ...
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4answers
4k views

OS with encrypted RAM?

Are there any applications, JIT frameworks or operating systems that focus on encrypted virtual memory, or perhaps virtual machines that do something similar? I know there are processors (albeit old, ...
8
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3answers
2k views

Am I protected from USB autorun malware on Windows 7?

As far as I know, the autorun.inf problem (the possibility of automatically executing code when a USB stick is plugged in) was solved through Windows Updates for XP, and on 7 it is no longer possible ...
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1answer
2k views

Where and how do operating systems save passwords for user accounts?

Where do operating systems (e.g. Windows) save their passwords? Do they store them in plain text? Do they use hardware modules such as TPM? Are these methods generally considered secure?