Management of semi-permanent interactive information interchange between two or more communicating devices, or between a computer and user

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1
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2answers
120 views

Storing encryption key in a cookie?

I have a website issue that I am addressing by storing an encryption key in a cookie. I want to describe my issue and my solution, and see if someone smarter about such things than I thinks this is a ...
28
votes
5answers
1k views

Why do you need to close your browser window after logging out of a website?

I might be wrong, but I believe the request to close the browser window after logging out is common, though it's completely unclear what the risks might be of failing to close a browser window ...
3
votes
1answer
175 views

Session Management for Private Key Passphrases in a Web Application

Use Case I would like to encrypt data in a database for a Web Application. The following requirements exist: Decryption should only be possible when a user provides a passphrase Encryption should ...
1
vote
1answer
67 views

Is HTML5 sessionStorage secure for temporarily storing a cryptographic key?

Assume I am building a local web application (e.g. browser extension) in HTML5 to encrypt a database locally. Access to the database is controlled by a password and a cryptographic master key is ...
3
votes
1answer
45 views

Is it safer to store valuable information on a unsecure client or send the data through the internet?

Background: I'm creating a secure web app with the purpose to act as a no-knowledge storage for small data (we're talking a few bytes). Since all the encryption and decryption happens client-side, ...
0
votes
1answer
32 views

How to manage a custom session in a webapp?

I was reading through the OWASP Cheat Sheet and something mentioned in the "Weak Authentication and Session Management" row did not make sense to me. It is recommended in the Design Column, that ...
0
votes
1answer
28 views

Signing (HMAC) cookie identifier

Related to this other question about sharing the secret to sign the cookies, my question is more trivial: how really secure is to sign a simple cookie identifier? In example, expressjs#session ...
8
votes
2answers
807 views

How is the session ID sent securely?

I'm learning session management and I have two questions for which I could not find answers on the web. Once the user is authenticated, the server creates the Session ID and sends it to the client ...
4
votes
3answers
172 views

Letting users pick up where they left off…without logging in (is this bad form?)

I have a Grails app I'm working on that allows users to fill out a fairly lengthy application form. One of the requirements I've been given is to NOT require users to log in or create any sort of ...
2
votes
0answers
51 views

Securing a JavaScript app with RESTful backend

I went through the question Securing a JavaScript Single Page App with RESTful backend that has discussions / options around securing a Javascript client side app that invokes RESTful APIs. However, ...
0
votes
0answers
59 views

Web app crypto scheme

For learning purposes I am trying to build a web application (Symfony2, PHP) that allows users to post content and have their own password vault, everything encrypted. Since I want to users to be able ...
2
votes
2answers
302 views

Exploiting a potential ASP.NET web app Session Fixation vulnerability

I am pen-testing an ASP.NET application that is exhibiting Session Fixation behavior. The application is using cookie based sessions. Basically: When you land on the page no Session cookie is ...
3
votes
1answer
56 views

At what level does session key entropy become a real-world issue?

Say we have a session key of between 0000000000-9999999999, providing 33.2bits of entropy. This is far short of the 128bits recommended by most. Of course, it is normally trivial to change session ...
3
votes
2answers
78 views

Should a session ID ever be sent over an unencrypted connection?

I'm teaching myself a touch of the most basic information security while toying with web dev, so that I can get a better understanding of the whole picture. Let's assume my website has user accounts ...
3
votes
1answer
853 views

Session Authentication vs Token Authentication

I am trying to get a handle on some terms and mechanisms and find out how they relate to each other or how they overlap. Authenticating a theoretical web application and mobile application is the ...
2
votes
0answers
39 views

SAML Without Session

Is there a way to implement SAML-based authentication to an IdP where the client keeps the session information? The idea is that a load-balanced server farm for the SP would be able to remain ...
3
votes
1answer
347 views

Session fixation in Java

In the process of developing a vulnerable jsp/servlet based application I made an attempt to introduce the session fixation vulnerability. Referring to the documentation I came up with the following ...
3
votes
2answers
117 views

How does a browser manage secure sessions and store session keys?

I am interested in how a browser manages secure sessions. As I understand it this is the scenario when logging into a google account: 1) Browser (B) and google Server (S) perform a handshake to ...
19
votes
4answers
5k views

Why users want to disable cookies?

I just started to create a new web application. In the documentation, it is written that I have to prepare for the situation where users have disabled cookies. This is not the first time I have read ...
0
votes
0answers
274 views

session management and login php scripts

I want to to write login scripts for clients websites to make them more secure. I want to know what best practices I can implement into this. There are password protected control panels in abundance, ...
4
votes
3answers
827 views

Deciding whether user has left the site without logging out or has simply left the site open for notifications without actually doing any work?

I am developing my site using server side sessions using redis as backend for saving the session. Now the issue which is bothering me is of user leaving the website without logging out. I mean user ...
3
votes
3answers
530 views

Passing session id in query string to maintain state in third party iframe - good practice?

I would like to allow the user to be "logged in" and maintain state / logged in status between pages within an iframe. The iframe content is ours, and will be hosted on various clients' websites. ...
0
votes
0answers
28 views

Securing php session using extra settings [duplicate]

I have googling on securing php session and came across this link http://www.wikihow.com/Create-a-Secure-Login-Script-in-PHP-and-MySQL where they suggest to start like this as below. $session_name ...
7
votes
3answers
303 views

What is the state of the art for forcing logout on browser quit?

Background: Most browsers have implemented some form of "Session Restore" functionality as a convenience to users where, if enabled, session cookies will be persisted across browser restarts. ...
1
vote
1answer
885 views

Using Random Numbers As Session variables

I am using randomly generated numbers as session variables to identify the sessions in a PHP application. To make further security proof what ways should I follow?
8
votes
5answers
2k views

What do the various browser “private modes” do?

Recently there has been some disagreement as to what "private mode" means when it comes to various browsers. Primarily I am referring to... IE's "InPrivate Browsing" Google Chrome's "Incognito ...
3
votes
1answer
821 views

Are there modules to harden Symfony 2 sessions?

We're looking at building a new app on top of Symfony 2, but security is our top priority. After digging around a bit, it seems that there are a number of built-in options for Session management (eg ...
11
votes
1answer
730 views

Webapp2 security

I am coding a REST web application that runs on Google App Engine, it authenticates API requests to privileged data using sessions by cookies provided by webapp2_extras.auth and ...
2
votes
1answer
126 views

Is this somebody trying to exploit a vulnerability?

On our website, when an invalid PHP session ID is detected, it's logged and regenerated. This invalid session has been logged: n040jl1nujch72tkrmr0uilnl1, ...
3
votes
2answers
135 views

Could HTTPS-Attacks like CRIME be mitigated by changing the session cookie regularly?

I was just reading about CRIME which is an attack to steal sensitive information by creating requests. Could this attack be mitigated, if the Server wouldn't send the client the actual session key to ...
0
votes
2answers
27k views

SSL Handshake failed

I’m working on windows desktop application which is created using C++ (IDE : Qt creator). It has login panel, where i do user validation via https connection using openssl 1.0 library. Application is ...
4
votes
1answer
164 views

How to store a group password for multi-user server-client web-application?

In a web application, accessed by browser via https, users need to be able to access data stored on a server in a MySQL database. Data has to be encrypted for several groups of users, where one group ...
2
votes
1answer
210 views

How secure are PHP sessions?

Should i worry about securing PHP sessions for my users? How do hackers steal the sessions? The information users of my site can view is not at all sensitive and if viewed or modified by a hacker ...
0
votes
2answers
291 views

How session cookies work? [closed]

I want to know the basic working of session cookies. When i tried googling, most of the results came were based on any programming language. I am not good at coding. So it will be helpful if someone ...
9
votes
2answers
4k views

Keeping user session alive - security considerations

We have recently developed some functionality for our web app to allow a user to remain logged in indefinitely, and are interested in knowing the security ramifications of doing so. The goal of this ...
5
votes
1answer
711 views

A Secure Cookie Protocol

As title says I'm trying to implement a secure cookie protocol HMAC(username|expiration name|data|session key, sk) It seams that session key is not constant during whole application session ...
6
votes
2answers
723 views

Modern, security-conscious, PHP book?

I posted this on StackOverflow and they redirected me here. Sorry if this isn't the correct area! After creating a simple login system and trying to protect it against things like SQL injection, ...
0
votes
1answer
124 views

Using encrypted data in session key instead of random

I am writing a service-oriented (REST) application that is (nearly) totally stateless: it can authenticate by API keys, but for web UI it uses the session where it stores nothing but an authenticated ...
7
votes
2answers
1k views

Are my session settings secure enough?

I'm developing a file hosting and sharing web application. Are the following PHP session settings secure enough? ini_set('session.cookie_httponly', 1); ini_set('session.cookie_lifetime', 0); ...
1
vote
0answers
105 views

Passing Encryption Key Across Session for Symmetrically-Encrypted DB

I'm building a database that symmetrically encrypts user data. Nothing super sensitive, I'd use a third-party if it was. The data is encrypted with a surrogate key; the user must enter a password to ...
0
votes
3answers
277 views

Does it have sense a One-Time Session Cookie?

Recently I have faced a site that seems to implement something that we can call "one-time cookie". This cookie is used for single-sign on among different sites. In each request the server sends a ...
0
votes
1answer
94 views

Setting a temporary cookie to an invalid value when logout improves security?

When a session is closed, for example, when a timeout triggers or when the user clicks the logout button, the session should be terminated at server side so the session cookie is invalid. I think ...
2
votes
2answers
417 views

How attacker can access victim's account without knowing its credentials?

I want to login facebook from a wifi connection and check sign-in page is over https but later when i don't pay attention to address bar (for example when playing games and click on links like a crazy ...
18
votes
5answers
1k views

Can you secure a web app from FireSheep without using SSL?

Assume that you want to give some web users privileged access to your website, but that you are unable (or unwilling) to offer SSL to all of them - at least past the initial login page. In this ...
8
votes
1answer
705 views

Understanding Session Fixation Vulnerability

What I've Read I'm read the following resources on session fixation, but I'm still having difficulty understanding some aspects of this kind of vulnerability: Ruby on Rails Security Guide § ...
1
vote
2answers
379 views

Is it safe to use Diffie-Hellman public keys as nonces to protect against replay attacks?

I have an interesting case regarding protection against replay attacks. Under the assumption that Alice and Bob have used Diffie-Hellman key exchange to establish a secure temporary session, would it ...
3
votes
1answer
673 views

HeartBleed - how do I invalidate all session cookies?

As part of the Heartbleed event, I have upgraded OpenSSL, reissued and replaced certificates and revoked the old ones and changed passwords however, I am also seeing advice to invalidate all session ...
1
vote
0answers
1k views

Do I keep my PHP simple auth session secure enough?

I'm experimenting with security, cryptography and web applications. My aim is to create simple login system that is realy secure enough. I'd like to share my approach to keep authenticated session ...
0
votes
1answer
334 views

Which approach to encrypting data on a per-user basis is more secure?

As a bit of a thought experiment, I've been thinking through how one might design a web application where a user's data (say, from a form on a webpage) is stored, encrypted, on the server, using a ...
1
vote
1answer
388 views

Increasing tomcat session id increases security

Tomcat gives a configuration sessionIdLength to be configurable, but does increasing the session id increases its security or its just security through obscurity