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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What does a MCSE need to learn to be proficient regarding *nix security?

I have a top notch Windows MCSE/MCSD (developer) who wants to broaden his skills with Linux security... but needs to update his skills from the Ultrix / Yellowpages days of 40 years ago. What ...
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1answer
478 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 ...
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2answers
542 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 ...
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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 ...
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2answers
413 views

How to improve VPS security?

I’m using Linux based VPS hosting, and a firewall and mod_sec help to keep most hackers out. However, over the last couple of weeks I noticed several entries in mod_sec showing that an unknown domain ...
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2answers
372 views

How to hack a Win95 machine?

While playing with old operating systems, I came across that there are no remote code execution exploits available for Win95 machines, running just file share (no IIS or anything else). Win95 neither ...
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1answer
287 views

Attacks against HIDS software running on the same machine

I am interested in the attacks that could be used to compromise or disable HIDS software such as Tripwire or Samhain. I understand that ideally checks should be run periodically and the database ...
4
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1answer
503 views

Security Risk of Disabling forceguest in non-AD Environment

Our application group is looking to deploy a product which requires that we disable forceguest in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa. We are running on a Novell network (I know, I ...
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3answers
854 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
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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2answers
784 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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5answers
1k 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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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.
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1answer
728 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 ...
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2answers
585 views

Security logs on Linux, Solaris and Windows

As the company's security department, our system administrators ask us what they need to log for SIEM (Security Incident and Event Management). We don't have any prepared documents and are seeking ...
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2answers
519 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 ...
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1answer
703 views

How secure is the Windows 8 “Reset your PC” function?

Windows 8 has a feature to "Reset your PC" so that if someone needs to give their computer away, the recipient won't be able to recover data. How secure is it?
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1answer
103 views

How can one gain additional privileges from being able to read kernel memory?

Given the ability to read (but not write) arbitrary kernel memory as an unprivileged user, what approaches might one take to gain additional privileges on the system? Ignoring the 'trivial' method of ...
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3answers
298 views

Is Chrome in Windows 8 Metro Mode more secure?

With Windows 8 and 8.1 Microsoft brings the Metro Apps, which are more secure, according to Wikipedia they are sandboxes. So I would be interested to know is it safer to run Chrome in a Metro Mode or ...
3
votes
1answer
399 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
279 views

OpenBSD-based LiveCD/LiveDVD - is it secure? is it offical?

Does the OpenBSD LiveCD/LiveDVD get deeply audited like the original OpenBSD? Is it an official "port"? Experiences with it?
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4answers
189 views

Tails like OS for Smartphones

In Jacob Applebaum's latest talk at the 30c3 conference, he advised all journalists to use Tails or similar OS for their laptops. Does anyone know of a similar OS or functionality for Smartphones? ...
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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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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
4k views

How can I recover encrypted files after system reinstallation

I had a file which contains images and videos, I was using the windows 7 ultimate and I had encrypted the file. Now I have copied that file to my hard disk and format that operating system and again. ...
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2answers
335 views

Security Risks Involved in Deploying Win Server 2008 on a Linux host

The Question: Are there any major security risks I should be concerned about, caused by installing Windows Server 2008 R2 onto a Linux Host in VirtualBox? I run an Ubuntu box, with a fully-secured ...
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1answer
139 views

Whitelisting applications in Windows7

Windows 7 and Server 2008 R2 come with a security tool called Applocker. This allows admins to restrict applications to a specific white list which can be as granular as the individual application ...
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5answers
2k views

How secure are iPhone/Android/Windows 8 “PIN”/Pattern Lock features?

Most modern (and tablet-oriented) operating systems now offer alternative ways of logging on other than a strong password. For example, iPhones offer a 4-digit PIN, Android devices offer this and a ...
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2answers
131 views

Is bugged CPU mean “gameover” for whole Computer? [closed]

I'm looking for answer on such question. Imagine that CPU bugged on the factory simply like Blue Pill, but for the network's interconnections. How exactly firewall of OS could protect station ...
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4answers
637 views

If someone steals my laptop while I'm logged in, how can I protect my browser?

My question has its roots in an xkcd from this week: http://xkcd.com/1200/ Isn't this true and ironic? We place so much emphasis on browser security and OS security -- and rightly so -- yet if I ...
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1answer
191 views

OBSD X11 as non-root?

If running X11 as root is not a very good idea, then can anyone mention a method/solution, how to still use a GUI, and not having X11 as root?
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1answer
32 views

After restoring from a (valid) full disk backup can malware still persit?

In the comments to this question it is mentioned that even after a backup recovery malware still can persist. Do I understand that correctly? How is this possible? If Acronis True Image is used to ...
2
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2answers
230 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
232 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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2answers
365 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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1answer
314 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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2answers
553 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 ...
2
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2answers
57 views

One computer with multiple OSs in different drives

I use my personal computer for both programming work and gaming at my free time(and sometimes penetration testing) all these in different operating systems each. The problem is that I dont really ...
2
votes
1answer
362 views

Where does Active Directory store user hashes?

During a penetration test for a client, having an infrastructure with multiple (5) Active Directory Servers (Win Serv 2008 R2)... I found a nice exploit to drop a system shell in one of the servers, ...
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1answer
435 views

Is 2008 Server Core installation the most secure deployment?

In a Windows environment where security is more important than flexibility is Windows 2008 R2 Core Server installation the best option? How much more difficult is it to setup an environment with ...
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0answers
37 views

Are files created in Chrome OS developer mode tracked by Google?

If I enable developer mode, then open a shell and create /some/directory/temp.txt, it is invisible to me through the Chrome Filesystem API. But does this mean that it's also invisible to Chrome OS ...
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0answers
49 views

Creating New Acc in Mac Mail 1st Connect to Server not SSL is uname & pw tx secure?

It appears that whenever you set up a new mail account on Mac Mail on OS X (or iPhone, iPad etc), that as soon as you enter the server and the mail account user name and password, Mac Apple-Mail tries ...
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0answers
97 views

BSD encryption advantages

If someone who knows about the BSD project has a moment to answer this, I'm wondering a few things about the encryption used. It's more than what I'm finding in the docs and on Wiki/Google (even the ...
2
votes
1answer
124 views

Force all user processes to be ptraced

I'm implementing a ptrace based tool for logging system call use. It is much more simple than strace, but I'm doing this so I can learn how these tools work. I'd like to trace all user processes since ...
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3answers
739 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 ...
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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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1answer
449 views

Firefox Desktop Shortcut Being Renamed

On my Vista PC the Firefox shortcut icon is being randomly renamed. The name changes to some variation of a recently visited URL. This unwanted action has survived several version updates. Of course I ...
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1answer
291 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 ...
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1answer
183 views

OS fingerprinting protection - why not by default?

This article describes how to fool nmap in it's OS fingerprinting detection. In short, nmap sends malformed packets to open and closed ports and listens to the responses. Because every OS implements ...
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1answer
500 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 ...