A cookie, also known as an HTTP cookie, web cookie, or browser cookie, is used for an origin website to send state information to a user's browser and for the browser to return the state information to the origin site. The state information can be used for authentication, identification of a user ...

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4
votes
1answer
325 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 ...
4
votes
1answer
383 views

XSS via PDF when Content-Disposition: Inline?

There are kind of two questions here: Is it possible to have XSS in a PDF file when the Content-Disposition: is "inline"? If it is possible, does the pdf get access to the cookies for that domain ...
3
votes
2answers
993 views

Reusing the same session-ID necessarily bad?

The question is related to session-ID management in a particular php-based web-app. The web-app uses the same session-ID for each session for a fixed user. So, after logging-out of the application, ...
3
votes
2answers
1k views

Is it possible to steal a non secure Cookie when the Web Server (IIS) only allows Https?

Is it possible to steal a non secure Cookie (Secure Flag is false) when the Web Server (IIS) only allows Https?
3
votes
2answers
2k views

How can Bank of America tell that I'm logging in on a computer I haven't used with them before?

When you sign into Bank of America for the first time on a computer that you haven't used with them before, they detect this and force you to answer one of your security questions. I think I've seen ...
3
votes
2answers
2k views

Is my current method of handling session cookies insecure?

I'm writing a multi-tenant application where accounts are scoped by subdomains. This adds considerable complexity and I'm starting to worry about security. Each user can have several accounts. For ...
3
votes
3answers
247 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 ...
3
votes
4answers
237 views

Improving the privacy of a casual Web user

I am interested in improving the privacy available to me as a casual internet user with a default browser. I think that Tor is too slow and that the "Privacy Mode" in browsers isn't really practical. ...
3
votes
5answers
643 views

Is it possible to see if a script on a website steals session cookies?

I'm looking as some web analytics solutions, I know it sounds paranoid. but cookie-based web analytics need for you to paste their JavaScript code on your web-site. I don't like the idea too much of ...
3
votes
1answer
248 views

Secure Flag and HSTS in HTTPS Only site

If I had a site only available in HTTPS should I still enable HSTS and Secure Flag?
3
votes
2answers
1k views

Web security - use of cookie in https

I am taking a web security class and was told by the instructor that most of the websites today use https for authentication and then use a cookie (authentication token) in plain text to keep track of ...
3
votes
2answers
4k views

Why are CSRF tokens necessary?

It seems that the entire problem could be solved very elegantly by simply adding a new flag to the HTTP cookie specification. Similarly to how cookies flagged Secure will only be submitted by the ...
3
votes
3answers
2k views

Where are the user credentials stored when remember password is selected?

Provided a user has chosen the remember me option while logged in last time into a web application,how does the web application server identifies the user next time when he logs in? The credentials ...
3
votes
2answers
386 views

Computer-level logging by financial institutions

I am looking for the best approach to recognizing a specific computer and saving that computer as a "safe" login machine. My intuition points me to using cookies, but what value do I store in there to ...
3
votes
2answers
48 views

Securely Erasing Cookies

Is there any sort of officially defined procedure (Eg from IETF) on how to correctly unset a cookie? I've always considered it best practice to unset any session cookies at logout for a web ...
3
votes
1answer
91 views

Logout tied to cookie expiry

I am looking for an event to automatically logout a user from the application. Typically I would do it when an inactive session expires. I was wondering if it is secure to do so using cookies. So here ...
3
votes
4answers
337 views

Some sites require that you accept cookies in order to use them. Does this mean that they can read/track my real IP?

The site I want to use says that it stores permanent cookies on my computer to track various things, for instance if I have two accounts with them. It says "Please note that if you set your browser to ...
3
votes
2answers
148 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 ...
3
votes
2answers
485 views

how is Google Ads managing to track me? (even if I don't keep cookies!??) [duplicate]

NOTE: in this question I am interested in discovering the actual method used by Google to track me -in my particular case- and in exploring eventual ways to circumvent it. This is completely different ...
3
votes
3answers
265 views

Why Parallels 8 installer looking into my Chrome's Cookies?

While trying to install Parallels on OS X I looked into Activity Monitor to find where is the installed Parallels located (it was weird that it stays invisible in Application folder). And than I found ...
3
votes
2answers
2k views

If a login/session cookie is stolen,does changing the password void it?

Considering the scenario where a Gmail session/login cookie is hijacked or stolen and it is discovered my means of Gmail last account activity,will changing my password immediately void the cookie or ...
3
votes
1answer
3k views

cookie issue with same domain same path but different port

I have two web app running on same host on same path but on different port http://somedomain.com/ and https://somedomain.com/ now when I visit first app it serves the cookie say with name abc, and ...
3
votes
1answer
280 views

What servers or clients are immune to related-domain cookie attacks? (*.example.com)

In this question, I want to identify browsers, servers, or implementations that are immune from related domain cookie attacks (e.g. a.example.com vs b.example.com). Lacking any tangible solution, ...
3
votes
2answers
74 views

In what case should one encrypt cookies?

I am curious how one decides whether to encrypt cookies or not? And if so when should one use public private key over symmetric encryption?
3
votes
2answers
187 views

Should I regularly erase cookies?

Cookies really do make for a better experience on the web but do they also create a vulnerability? How often should I clean them out and what benefits are gained by doing so?
3
votes
1answer
148 views

Storing personal information in cookies

I'm trying to do a simple display integration between two websites. One on: domain.com and another on: subdomain.domain.com All I want to do is show a "Hello John, Return to Client Area" ...
3
votes
2answers
244 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
1k views

How to MiTM insert an iframe using burp or another tool?

So, I am trying to obtain a cookie without the secure flag enabled over HTTPS. After reading about it, I came across an answer: You visit https://secure.example.com/ which drops a cookie on your ...
3
votes
1answer
4k views

Should cookies that contain non sensitive information be encrypted?

I'm in the process of creating a website and uses cookies to track user login. The only bit of information I store in this cookie is the users username. Should I be encrypting the username even ...
3
votes
1answer
217 views

Session Token Embedded in Form

I have a session token that's stored in a browser cookie client side. The cookie is already available for scripting and it's used to validate XHR through Javascript. For a particular page I'm using ...
3
votes
2answers
50 views

Signing Double Submit Cookies, where the value is a pseudo random string and a signature of it. Is this more secure?

I'm not sure if I am describing something that has already been proposed. If not, I would like to coin this "Signed Double Submit Cookies" as a method to improve the Double Submit Cookies technique ...
3
votes
3answers
135 views

What CSRF attacks will 'First-Party-Only' cookies protect against?

The new 'First-Party-Only' cookie attribute: ... allows servers to assert that a cookie ought to be sent only in a "first-party" context. This assertion allows user agents to mitigate ...
3
votes
1answer
68 views

Is same origin policy for web only useful because of cookies?

There is a same origin policy in the browser to ensure that e.g. bad site won't read your data from Facebook. But it seems that the only problem that it tries to solve is that cookies are ...
3
votes
1answer
217 views

Would this work to protect a cookie with an OAuth token?

I'm currently trying to set up an OAuth 2.0 authentication scheme to protect some stateless REST webservices. These services deal with sensitive information, and the OAuth support is a requirement. ...
3
votes
1answer
115 views

Possible issues when one or more cookie not HttpOnly

I have a question related to HttpOnly cookie. Tracking other threads wasn't of much help, hence I am posting my query here to learn if you can foresee any issues with my understanding. There is a ...
3
votes
1answer
922 views

Does using token-based auth make CSRF checks on login unnecessary?

Based on my understanding, avoiding the use of cookies as an authentication mechanism prevents CSRF vulnerabilities entirely (namely token based authentication in an SPA), when authenticated. Does ...
3
votes
3answers
408 views

Are there any same origin issues (SOP) with TOR?

Are there any issues with Same Origin Policy (SOP) with TOR or *.onion addresses? I'm thinking of cookies Plugins (Silverlight, Flash, Java, etc) Javascript
3
votes
2answers
213 views

How can I tell who's using my cookie information on an open LAN?

I think someone is using my cookie info to log into my Facebook account on a public Wi-Fi network. How can I determine if this is happening and from what IP address?
3
votes
1answer
85 views

Separate third-party cookies for each website

Instead of blocking third-party cookies (which might be useful), why don't browsers allow them, but keep all cookies separate for each address-bar website? For example, if a third-party website sets ...
3
votes
1answer
137 views

API which does not allow to invalidate session on server side - how to make it more secure?

I'm writing an app around a REST API which does not allow the server to invalidate a session - i.e. there's no endpoint like logout which will make the cookie my app is using be invalid from now on. ...
3
votes
2answers
182 views

Is it normal for a payment procedure to ask for third party cookies to be turned on?

I was trying to pay for mobile phone credit online from a service provider. I selected the amount to pay and clicked next to continues. The following page asked me to turn on third party cookies if I ...
3
votes
1answer
179 views

Vulnerabilities of having one path of app accessible only via HTTPS but others via HTTP?

Imagine example.com that is accessible via HTTP and HTTPS. Most of content at site isn't secure and it won't be bad if it will be read by attacker. One of paths - example.com/secure_zone is accessible ...
3
votes
1answer
1k views

Storing users cookies in a database on a server

I want to use Apple Push Notification Service, so I need a server. This server will have to check a site every x minutes. How the site that has to be checked requires the user to login. So is it ok ...
2
votes
1answer
141 views

What's the point of rejecting a cookie?

When you access a website, lynx provide the option to reject a cookie, what's the point of doing so? All I thought about is that if you don't accept a cookie, you cookie won't be stolen during a XSS ...
2
votes
3answers
563 views

What do web trackers know about/think of me?

Many companies use HTTP cookies, flash cookies, and other analytics to track visitors on the web and classify them. How can I find out what my web profile is currently, and what these trackers are ...
2
votes
2answers
117 views

Is encrypted cookie without authentication secure enough?

I have some sensitive data in the cookie, e.g. it contains the user id that is later on used to execute the query and we trust the cookie because it is encrypted. All communication happens only on ...
2
votes
2answers
110 views

Is it any more or less secure to delete all my cookies vs. individually logging out?

So I've lost all of my Firefox bookmarks (well not since 3.0) or history (3.5?) or my current session enough times (yeah... this still happens) that I don't leave my precious Firefox profile to ...
2
votes
2answers
1k views

What if a browser does not understand the secure flag of cookie

I have two questions related to the same: 1 - As 'Httponly' attribute is understood by a set of modern browsers (https://www.owasp.org/index.php/HttpOnly#Browsers_Supporting_HttpOnly), I was ...
2
votes
1answer
48 views

Is a 'remote' cookie replay attack possible?

Once a cookie is stolen from the session of a legitimate user, can I perform a 'remote' cookie replay attack on that user? I am successfully able to perform a cookie replay attack on the same system, ...
2
votes
1answer
864 views

Mandatory to implement HTTPOnly if Java Secure Cookies are set to 'true'?

Here is a test case from a recent application security asessment which I have had experienced: cookie = new Cookie(strKey1, EncryptDecrypt.encrypt(strValue)); cookie.setMaxAge(-1); ...