Tagged Questions

A security mechanism which enforces policy describing which requesters may perform operations on specified objects. There are typically multiple types of operations. Common operations include: read, write, execute, append, create, and delete.

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2
votes
2answers
19 views

What port services can hackers use to break into a server?

I am getting ready to run my first server. I will use ufw to disable every port except port 22 for ssh and port 80 for http. I am curious though. Suppose theoretically I left every port open except ...
0
votes
2answers
25 views

Access token vs. UserID + access token

My goal is to associate (authenticate) hardware devices to users in the database. The access token is generated via webinterface. It is then entered into the hardware device by the user, and the ...
-1
votes
1answer
50 views

how to gain root access to linux machine? [on hold]

I am a security auditor and I have faced the following situation: A development company that has a group of Linux machines gives limited access to their users. They asked me to find out all the ...
1
vote
0answers
15 views

Safety in Access Control Matrix and Take-Grant Model

I'm learning about the Take-Grant Model and Access Control Matrix, and I have a couple of questions regarding leaking and the safety question. Definitions These are the definitions I am using (see ...
1
vote
0answers
15 views

Access Control that are used on Ubuntu? [closed]

I want to ask about access control that are used on Ubuntu. I already read Ubuntu Access Control List but I'm still confused. Is there someone can explain about access control on Ubuntu? Because ...
1
vote
5answers
127 views

Is there a term for Authorizing before Authenticating? Is it even common?

In most scenarios a person identifies who they are (authentication/AuthN) via something like a username and password. Afterwards a system would likely evaluate what that validated identity can perform ...
1
vote
1answer
54 views

Is it safe to store important data in an encrypted access token?

Is it safe to store important data in an encrypted access token? For example, instead of storing access tokens in a database, not storing them at all and putting their associated data into them before ...
3
votes
1answer
37 views

Enabling Unsigned ActiveX

A third-party wants to provide a web app which they say only works if we enable unsigned ActiveX (unfortunately users are required to use IE). I understand what 'signing' is, as well as the basic ...
2
votes
2answers
91 views

How risky is having sensitive files on webroot?

I understand that having anything sensitive under webroot is not smart; someone may be able to access it via url. However, I do not have a choice with my web host (iPage) as they limit my server space ...
1
vote
2answers
124 views

Contactless session on ATM?

I'm currently reading about an access control and saw something interesting about smartcard contact & contactless. From what I understood from the book, smartcard contact is like an ATM Card. ...
0
votes
1answer
25 views

Directory Listing on WordPress

If a WorPress application that uses the Akismet wordpress plugin has certain directory listing exposed publicly, like, akismet-en_AU.po and the other .po files, and directories like plugins, themes, ...
1
vote
2answers
134 views

Teamviewer Security Question

Currently we are using Teamviewer 9. We have a couple of desktop machines that are locked down in the following manner: 1). The shell is no longer explorer.exe, it is a custom program we have ...
2
votes
2answers
72 views

Should I use a separate SQL Server instance for a database with PII?

We build software which needs a SQL SERVER database. This database will hold private user information (address,bank, ...) My question is: Should I install my database in a fresh SQL Server ...
0
votes
2answers
103 views

Can I use stormpath user management service with a XACML library like BALANA?

I'm trying to implement some security access control in a software I'm building. I came across Stormpath for user management and they have somewhat an approach for RBAC yet what I was considering is ...
27
votes
5answers
4k views

Is Linux really that secure, with only root password denying external access?

While I was searching online for information about Linux security, the most typical explanation was: Linux is secure, because the root password is required to access the kernel and install new ...
3
votes
1answer
84 views

Access rights management in large companies

I'm wondering how large companies with tens / hundred of applications are handling access-rights for their users. From what I've seen, it's a nightmare that never ends, and it requires full-time ...
0
votes
0answers
44 views

Why allow access without an access token but deny access with an invalid access token?

I encountered a data storage service with rather weird access policies. There're "folders" with "files" and each "folder" can have either of the following permissions: anyone in the world can ...
2
votes
1answer
801 views

MAC vs DAC vs RBAC

Someone can suggest me a real situation in which is better to use MAC (Mandatory Access Control) instead of DAC (Discretionary Access Control) or RBAC (Role Based Access Control)? And in which DAC is ...
4
votes
5answers
151 views

Can someone please explain RBAC to me?

From http://msdn.microsoft.com/en-us/library/jj709705.aspx In contrast to the DAC model, which is oriented around objects, the AzMan RBAC model attempts to orient the common administrative experience ...
0
votes
3answers
140 views

Securing apache by IP with .htaccess

I have a folder that I don't want to be accessible from outside my network's LAN. It seems like all traffic from the outside world goes through my firewall (192.168.1.39). So I made my .htaccess as ...
0
votes
1answer
173 views

is UPnP / NAT-PMP really necessary today?

The possibility to enable port forwards for any hosts inside the LAN has of course security implications. The problem from my point of view is not that there are bad users, but bad hosts/programs and ...
1
vote
2answers
42 views

Should application logs be available to admins or just superuser?

I'm developing a kind of standard web-application, to be hosted internally on few customer's servers (not a public service, startup or anything like that). A kind of CMS, e-learning platform or ...
1
vote
1answer
150 views

Is a firewall an access control list?

I want to know if a firewall is considered an access control list (ACL). I know there are other types of ACLs, but am specifically interested in knowing if a firewall is an ACL. Edit: It appears ...
1
vote
1answer
60 views

Is open-to-all CORS safe for non-cookie-based authentication schemes (e.g. OAuth)

I'm building an API with both protected and public endpoints, and I'm protecting it with OAuth 2's various flows. I want this API to be open to the world - the main consumer website won't even be on ...
0
votes
0answers
44 views

Bell-LaPadula implementing by using sets of roles

I have sets of roles defined hierarchically, i.e. role anonymous is a subset of role super-user. The roles are given tu users and also used in the ACL for marking who has access to a resource. ...
0
votes
2answers
63 views

How many accounts should I have in an information system?

Is it a problem to have more than one account in an information system from security point of view? Let me clarify a bit. It is a bank system. I wonder if having a CSO (customer service officer) ...
1
vote
1answer
178 views

Physical vs Logical - Location/Address

According to the CJIS Security Policy - Access Enforcement The information system shall enforce assigned authorizations for controlling access to the system and contained information. The ...
21
votes
7answers
7k views

If a Windows laptop with an encrypted hard disk is stolen, can the contents be accessed by a professional hacker? [closed]

In other words, how easy is it to break into Windows without having the passwords for any of the users configured in the computer?
2
votes
1answer
318 views

How can the Google web crawler bypass portals?

This is a situation that I have encountered on a number of occasions. I will conduct a web search in Google, a link to a file (.pdf for example) will take you to that file on the server. It opens up ...
4
votes
1answer
123 views

Car Remote App Security

Car manufactures like BMW, Audi or Mercedes-Benz all provide mobile applications to control your car. All apps share really critical functions like remote lock/unlock or the ability to find your car ...
0
votes
3answers
150 views

What security issues will I face with outsourced VPS server?

Our small comapny wants to launch a paid service, hosted on the outsourced VPS server. The obvious risk is that the machine is physically not in our office and that possibly the database could be ...
1
vote
1answer
63 views

what are security flaws on providing access to users through a unlisted/private/token/signed URL?

Some web applications enable registered users to grant temporal application access to un-registered users sending token/private/unlisted/signed URLs (I ignore the exact terminology for this), which ...
0
votes
0answers
204 views

Since when Access-Control-Allow-Credentials is required?

About several years ago I found a website during a pentest which had the Access-Control-Allow-Origin header set to "*". I made a POC to get the response of a webpage from an untrusted domain. The goal ...
0
votes
3answers
51 views

Restrict access to admin area by checking SSH connections

Assuming that the users have dynamic IPs (so I can't whitelist) and that setting up a VPN is not an option, is it a valid approach to restrict access to an administration area by only allowing IPs ...
0
votes
2answers
54 views

How to handle data-dependent Claims?

This question is about Claims-Based Authorization and Windows Identity Foundation (unfortunately I lack the priviledge to create a tag for this). Consider the following simple use case: I have a ...
-3
votes
1answer
216 views

How could an attacker have gained remote access to my laptop? [closed]

I have a 15 yr old daughter who's become not only a certified Microsoft Expert, but by pure accident, it came to my attention she'd long ago created a SPLIT network connection on our internet, HIDDEN ...
-1
votes
2answers
197 views

Is there a difference between Broken Access Control and Insecure Direct Object reference? [closed]

According to me,if this difference is correct,it is that for exploiting a broken access control you don't necessarily need to be logged into the application,but for exploiting insecure direct object ...
6
votes
2answers
985 views

What are best practices for implementing ACL

I have a website that has certain menu items that need to be hidden from end users. The web site has PHP in the front-end and Java and Spring in the back-end, deployed on a Linux OS in a VM ...
4
votes
2answers
615 views

Claim Based Authorization vs Attribute Based Access Control

Is there a difference between Attribute Based Access Control which is usually associated with XACML and Claim Based Authorization which seems to be a term coined by Microsoft? Is the latter simply ...
4
votes
2answers
2k views

Securing remotely accessible IP cameras that do not support HTTPS

I have some IP cameras set up on my home network, which is WPA2 protected. These cameras are setup to be accessible from the Internet thru my router's DDNS address, and port number. So for example, ...
5
votes
3answers
126 views

Is SESAME really used in Europe?

I am looking at a text that mentions that the Secure European System for Applications in a Multi-vendor Environment (SESAME) was designed to address some of Kerberos weakness, with enhancements such ...
2
votes
0answers
756 views

Google ads and/or DoubleClick wants to access the keyboard API in Firefox? [closed]

I have started Firefox in an Ubuntu terminal, and now I see these messages during browsing: "No permission to use the keyboard API for http://googleads.g.doubleclick.net" I mean... WTF? Why does ...
2
votes
0answers
129 views

Can we create custom APDU for non-smart (memory type) contactless card?

I want to implement card-based authentication for the parking system in a university. Currently all students own a Java Card-based student ID card, if they have not broken or lost it. Can we create ...
44
votes
5answers
4k views

How does a country block its citizens from accessing a site?

Following Turkey's recent social site blocks, I am wondering how can you efficiently accomplish that as a country. Similar for a big company. Blocking IPs → easy to circumvent, (proxys, tunnels, ...
3
votes
1answer
796 views

Looking for approach to implement attribute based access control (ABAC)

We are looking to implement Attribute-Based Access Control. While we are sold on the philosophy, there are two topics that seem to crop up: Will it lead to significant performance issues? Especially ...
0
votes
2answers
79 views

Anonymizing data for applications

I try to design a system which reads events comming from devices, stores them and exposes API to various applications. Originally I wanted to introduce a module Id translator, so I would store only ...
1
vote
4answers
183 views

Comprehensive audit of firewall - is Internet truly not accessible?

We have many Linux servers in several co-locations over the world. By design, these machines generally should not be able to access the Internet. Depending on location and role, some sites may have ...
0
votes
3answers
216 views

Is a console application with NT Authority/System rights dangerous?

A developer managed to open a console application with NT Authority/System rights at the startup screen before logging in. From that command prompt it is possible to execute arbitrary programs like ...
0
votes
1answer
172 views

Employee Snooping [closed]

I just got hired at this SW tech company with a few IT gurus in it. There is a clever genius that is suspect. He obtained my personal home email address I use. It was obtained from company ...
40
votes
8answers
8k views

Why am I allowed to access protected Windows files when I boot Ubuntu from USB?

How come I'm allowed to reboot a computer that I don't own, put in a USB, boot ubuntu from it and then access all files stored on the drives available (even critical files such as system files on C ...