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 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 ...
3
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1answer
34 views

OS fingerprinting [on hold]

I have been asked to write a small tool that detects the running OS on a victim device. The tool should be able to fingerprint Linux versus Android versus iOS. Extra credit for version info. It needs ...
3
votes
1answer
119 views

OS login password: How does it work?

I am making an application to create a password for a user. I am a bit baffled over how it all works though. Namely I want to be sure that my application will store the correct hash so the user can ...
3
votes
1answer
264 views

Is there a GNU/Linux or BSD distribution dedicated to air-gapped computer?

I am currently in the process of setting up an air-gapped computer which will be dedicated to managing cryptographic key (including: generation of GPG key/subkey, management of a small CA, generation ...
3
votes
1answer
384 views

What do Msgsrvr and Scientia-ssdb do?

I'm having a task in a computer security class in school where I'm supposed to scan a host for open ports in order to find out what services are being run there. I have found out (among other things) ...
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5answers
1k 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 ...
3
votes
1answer
678 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?
3
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1answer
272 views

How does binary code execution vulnerability work on a modern OS?

In a modern OS I think that: the .text section where binary assembled CPU instructions are stored cannot be modified the .data/.bss section is marked as no-execute so that the information there will ...
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0answers
145 views

BSD encryption advantages [closed]

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 ...
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3answers
4k 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? ...
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2answers
3k 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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4answers
2k 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
302 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 ...
2
votes
1answer
142 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
533 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 ...
2
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1answer
172 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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3answers
1k views

Security in Windows 7 vs Ubuntu

I have two semi-related questions about the security-related reasons I hear for switching to Ubuntu over Windows 7 (or from other Windows OSs to other Linux distributions). Someone people say that ...
2
votes
2answers
214 views

Is it possible to defeat the OS detection capabilities of network scanning tools?

Network scanning tools such as nmap have the capability to infer operating system version based upon lower-level system details. EG: TCP/IP stack behavior, etc. Are there any known methods to trick ...
2
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2answers
501 views

How is it possible that a text message can reboot an Apple device?

I was reading through my infosec newsfeed and found this article: http://www.theguardian.com/technology/2015/may/27/iphone-crash-bug-text-imessage-ios It basically talks about a bug iOS has while ...
2
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2answers
158 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 ...
2
votes
1answer
776 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
votes
2answers
612 views

Sun ILOM / Out of band management security concerns

I would like to get some outside opinion on this if possible, although I do not know what to ask. Sun ILOM is an Out-of-band management system. I understand it is a separate OS on the box that is ...
2
votes
2answers
56 views

Is it fundamentally possible to develop a (provenly) transparent computing system?

I recently asked a question regarding security obstacles of online voting via a web service, and one of the primary obstacles to doing this is the difficulty of proving that the program processing ...
2
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2answers
210 views

exploiting setuid and setgid bit

I was reading material on secure coding and at many places it is mentioned not to use setuid and setgid bits for privilege escalation. These a vulnerable and can lead to security issues. Instead we ...
2
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1answer
52 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 ...
2
votes
1answer
114 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
487 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.
2
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1answer
184 views

What is susceptible to Kon Boot hack tool?

I just learned about Kon Boot (from this YouTube video) and am wondering, how is such a hack tool guarded against? In the video the presenter claimed he had full disk encryption but was still able to ...
2
votes
1answer
156 views

Resources to learn about Windows systems exploitation [closed]

I'm a beginner in penetration testing, and I'm struggling with finding decent material to learn. I used book about nmap, Metasploit, exploit writing etc..., but they contained too much information ...
2
votes
1answer
222 views

ARM TrustZone with Normal and Secure World

I am new to Security testing and I am working on a 64-bit ARM server. We are using ARM TrustZone technology. Is it possible for me to check if I am in the Secure world or the Normal world? How do I ...
2
votes
1answer
6k 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, ...
2
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1answer
530 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 ...
2
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0answers
41 views

userWorkstations attribute in AD preventing users from logging into WebApp

For some of our users in AD, we have set userWorkstations attribute to restrict access to other machines. But this is preventing those users from logging into WebApplications (around 50+) protected ...
2
votes
0answers
102 views

What protections are put in place to prevent rootkits from getting ring 0 access?

I've been learning about What is a rootkit? As well as rootkit building and general system architecture. I have read that there are "User mode" rootkits that run in ring 3. But these aren't the ...
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0answers
69 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 ...
2
votes
1answer
199 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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vote
3answers
1k 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
91 views

Trust a possibly compromised system for iso downloads

My only operational computer has shown some wierd signs like disapearing logs, rotated logs gone random files getting updated and so on. Tho this is my only operational computer and I have decided to ...
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1answer
600 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
496 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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2answers
93 views

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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2answers
188 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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2answers
342 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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1answer
76 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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1answer
244 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
87 views

NMAP Scan Returns Odd OS Detection [closed]

I am new to NMAP but I was using it to troubleshoot some issues I have been having. I ran a scan on a device and I know the device runs some sort of Linux or Ubuntu OS and I was attempting to figure ...
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1answer
638 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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2answers
191 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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2answers
125 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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2answers
257 views

Intrusion Detected - OS Attack

I have recently gotten a prompt from my anti virus stating that there was an intrusion with an OS attack as describe in the link below: ...