An application that is accessed over a network such as the Internet or an intranet using a browser.

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1answer
1k views

How can log poisoning be successful with a Local File Inclusion attack?

I just read a paper about Local File Inclusion on exploit-db.com, it can be found here. One technique with LFI is log poisoning as you may know already. You do an HTTP GET request that contains PHP ...
6
votes
2answers
431 views

With Google's new Privacy Policies going into effect soon, how can I better protect myself using their services?

From what I can tell, the gist of the new Privacy Policy from Google is that they're making a blanket policy to allow using your data between all their services, however they see fit. So now one ...
5
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2answers
1k views

HTML 5 Security Code Scanner

Are there code scanners in the market that scan HTML 5 code? Does anyone have a list of tags of specific CORS configurations that need/can be scanned?
2
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1answer
225 views

Is 90 day expiration for unique URL too long?

A web application I've been developing has a new use case that has me searching for something easier than username/password authentication. Current users don't sign up for the service themselves ...
25
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5answers
4k views

Could mint.com be more secure, and if so, how?

After reading a bit about mint.com on the money stack exchange, I wanted to give it a try. But frankly, it scares me a little bit. The site has a bunch of links explaining how they're so secure. I ...
2
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2answers
379 views

HTTP + HTTPS + One Time Pad/stream cipher

I'm designing a web application where users will exchange short messages with the server very frequently (for instance, a few characters every second). I want the whole communication to be ...
3
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4answers
1k views

SQL query sanitation (black list)

I have a following problem/challenge: Web application (ASP.NET 3.5) installed on corporate LAN and operates on SQL Server DB needs to provide ability to generate custom reports. These reports can be ...
5
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2answers
158 views

What kind of cache-related attacks exists on the Web?

What kind of cache-related attacks exists in modern Web world? The only one I'm aware of is Cache Poisoning. Is there anything else I should be worrying about?
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3answers
3k views

Determining a reasonable session timeout limit [closed]

What's a resonable session timeout limit and how can you determine it?
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2answers
690 views

anti-CSRF tokens vs Referer and POST testing

I understand anti-CSRF tokens to be a chunk of data sent in the response that is expected to match in subsequent requests, but is not stored in cookies. For example, a form with a hidden value that ...
0
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3answers
4k views

How to exploit this SQL inection vulnerability?

I am learning SQL injection on a vulnerable Web App. I scanned it with w3af. It showed many vulnerabilities. One of them is : SQL injection in a Microsoft SQL database was found at: ...
8
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3answers
1k views

How bad is a Self Contained XSS attack?

Some of you might be familiar with this attack called Self Contained XSS. I recently stumbled upon this article about it. So how bad this kind of attack can be, even though this doesn't have access to ...
11
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1answer
2k views

Best way to secure javascript front end/REST back end architecture web site?

I would like to build the following project: public REST API back end which can be accessed by any authenticated client. front end with static files in HTML/CSS/Javascript with Backbone.js jQuery ...
4
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3answers
224 views

Should user input be validated for it's length?

Is it bad not to validate length of user input to text field at server side. May it lead to such vulnerabilities as buffer overflows and other? I think it depends on programming language of ...
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2answers
2k views

Is it safe to transfer Facebook access token via TCP?

Is it safe to transfer Facebook access token via TCP? What is the worst that can happen if someone gets the token?
6
votes
3answers
2k views

Where can I find exploit code?

I am doing VA/PT on a sample web application. I run the nessus scanner and I found some high severity problems. It is related to HP System Management Homepage. The CVE numbers are: 2010-1917, ...
3
votes
1answer
338 views

Security for a low latency online multiplayer game

I am designing an online multiplayer game and I am looking for a good tradeoff of secure communications with minimal CPU and bandwidth utilization. My ideal solution would only use UDP packets since ...
6
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6answers
1k views

Filter user input before the database or upon display?

Given a web application where user data must be properly escaped to avoid XSS, is it better to try to remove the "bad stuff" before it enters the database, or is it best to allow it in the database ...
4
votes
6answers
899 views

When storing private identifying information in a web application, what is “industry standard” best practices? [closed]

I am building a hosted (SaaS) web application that stores PII like name, email address, and employer of the user. As of right now, I don't intend to ever store credit card numbers or bank account ...
2
votes
4answers
1k views

Web Security Certifications

I'm looking for a certification for Web Application Security and Web Pen Testing. Via Google I found the following two: Certified Web Application Tester GIAC Web Application Penetration Tester How ...
5
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2answers
2k views

Antivirus for scanning anonymous file uploads

Since I have no experience with AV solutions on Unix-like environments, I would need help with suggestions on something that can be suitable for scanning files that are uploaded by anonymous users ...
9
votes
3answers
1k views

localStorage for apps over https. What expectations are there?

I run an online gradebook. To keep student data private, I transfer all data over https. Now, I'd like to use localStorage to avoid redundant calculations and server requests. However, according to ...
10
votes
4answers
351 views

Should a web application return true http errors?

Exception and error information can be used by a malicious user to map out the API of an web application, so it is routine to see security checklists to advise returning only a "Please contact your ...
2
votes
3answers
1k views

how an iframe can cause xsrf?

I know how a form tag is prone to CSRF which does not use any token (or any other challenge-response mechanism) but I was wondering how an iFrame can be used to cause XSRF attack and what would be the ...
2
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2answers
2k views

Secure SSL Session from losing itself into unsecure http

I've seen some implementations of HTTPS SSL and, as a visitor, forced to rely to a lot of those. What would a secure implementation look like and where can one expect problems? I expect the installer ...
9
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6answers
507 views

What are web attacks which users can run code on your servers?

I hear stories about insecure web servers and sites which people (or bots) break into and execute their own code on the server. My question is how is that possible? I heard of people putting their ...
4
votes
3answers
526 views

Secure data transmission and storage

We currently have an application that we deploy via the web, users access it by connecting to a link which opens an executable file. This file was compiled with visual foxpro. My question is - is ...
5
votes
1answer
142 views

Is it safe to allow untrusted field names in JSON?

When forming a JSON data structure, are there any security risks with allowing the field names to be chosen by an attacker? You can assume they'll be quoted properly. I'd like to know if allowing ...
6
votes
3answers
277 views

How do I secure my advertisement space against ad overlay browser attachments?

I don't really have an issue with advertisements simply being blocked by individual users who are visiting a customers site or my own site. As an individual you have the freedom to choose not to look ...
2
votes
1answer
400 views

What threats does a stateless web application have? (as opposed to a “state-full” sessions)

I'm comparing the pros and cons between having an authenticated "stateless" ASP.NET MVC session versus a ASP.NET Forms application with viewstate. Assuming that there is a webfarm of more than 1 web ...
10
votes
3answers
383 views

Should I ask a user to re-authenticate if the browser thumbprint changes? Is a server side library available?

Is there a security benefit to using the browser's thumbprint in addition to a session identifier to identify a unique session? Would it then be advisable to ask the user to reauthenticate (or simply ...
10
votes
5answers
8k views

Benefits of identifying clients based upon the “X-Forwarded-For” or similar HTTP header in addition to Client IP

The X-Forwarded-For header is used by some HTTP proxies to identify the IP address of the client. The wiki page (linked above) mentions that ISPs may use this header as well. In addition there are a ...
6
votes
4answers
2k views

CSRF protection needed for clients that don't accept cookies?

I have recently updated a website from Django 1.0 to 1.3. One of the changes introduced was automatic protection against CSRF attacks. For the most part, this works great, but I have a problem with ...
3
votes
3answers
274 views

Where's the security when a payment gateway let website handle Credit Card detail

Has anyone worked with eWay payment gateway before? Basically, there's a service endpoint where you post the customer's detail and credit card details from the web application after the browser sends ...
14
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4answers
738 views

Is it safe to store and replay user-provided mime types?

If a user uploads a file but modifies the request by setting the mime-type to something arbitrary, like "superdangerous/blackhatstuff", is it safe for me to send the same mime type back to a different ...
22
votes
4answers
6k views

https security - should password be hashed server-side or client-side?

I am building a web application which requires users to login. All communication goes through https. I am using bcrypt to hash passwords. I am facing a dilemma - I used to think it is safer to make a ...
6
votes
3answers
1k views

Why banking websites always ask me to authenticate my PC even after I'd chosen to “Remember my Computer”?

Why banking websites always ask me to authenticate my PC even after I'd chosen to Remember my PC? This is the case with all banking websites
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5answers
1k views

Websites that interactively test browser security (XSS, CSRF, Javascript, etc)

I'm looking for a comprehensive list of browser test sites so that I can visually prove that the browser is patched and configured for safe web browsing. My intent is to know what risks may exist ...
1
vote
1answer
365 views

What does a Yadis / XRDS discovery session “look like” to the end user? How does it work? Is it relevant?

I can't wrap my head around how Yadis / XRDS would be used by a typical end user, or how it works so transparently? Considering that this technology isn't adopted by mainstream IDPs that makes me ...
12
votes
6answers
1k views

Securely building a local pentest lab in a VM

I'd like to set up OWASP WebGoat or a similar vulnerable web app in a VM (probably VirtualBox on Linux). For convenience's sake, I'd like to get it running on one of the primary machines I use (say, a ...
15
votes
5answers
5k views

Preventing information disclosure from browser back button/history?

I have sensitive data that will be hosted on a website, and I would like to prevent the data from being exposed in this scenario: The primary user logs off the application, but does not close the ...
5
votes
1answer
231 views

What is the status of forced HTTPS everywhere (Strict transport security) via DNS? I only see last years draft

I'm trying to find the most recent RFC on HSTS in DNS (or rather said DNSSEC), but can only find this year old one in expired draft status Where can I find the most current guidance on STS in DNS? If ...
19
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1answer
13k views

What key exchange mechanism should be used in TLS?

There are many key exchange mechanisms that can be used in TLS. Among them are RSA, ECDH_ECDSA, ECDHE_ECDSA, ECDH_RSA, ECDHE_RSA and others. Which of these are more cryptographically secure and can be ...
1
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2answers
256 views

Is the OData Protocol susceptible to Insecure Direct Object References?

The Open Data Protocol or OData is a great protocol created on top of Web Technologies.It uses the URI convention for the data exchange using Atom, JSON and XML. You can use the URI convention ...
7
votes
3answers
916 views

How serious are XSS attacks

A website I visit allows this kind of attack, to be implemented with GET in the URL <SCRIPT SRC=http://ha.ckers.org/xss.js></SCRIPT> Along with many others on this page: ...
32
votes
3answers
9k views

Why is the same origin policy so important?

I can't really fully understand what same origin domain means. I know it means that when getting a resource from another domain (say a JS file) it will run from the context of the domain that serves ...
6
votes
7answers
967 views

Should I prevent sending of GET requests for urls that are normally operated with POST request?

There is an url that is normally operated using POST requests (i.e. POST request is sent when user submits form). But attacker can form GET request with parameters that are sent in POST request. This ...
3
votes
0answers
427 views

When to move from Container managed security to alternatives like Apache Shiro, Spring Security? [closed]

I am trying to secure my application which is built using JSF2.0. I am confused about when do people choose to go with security alternatives like Shiro, Spring Security or owasp's esapi leaving ...
9
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3answers
2k views

Is it possible to forge a post request?

Consider the following URL http://mysite.com/form?date=x. Suppose that if x is in an incorrect format, that a page is returned with <p>x is not a valid date</p>, where the page author has ...
4
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1answer
8k views

AES-256 OR RSA-2048 for web application security?

I'm developing a web application with a database backend using Django that will be accessed from the Internet. The database will contain sensitive information and I'd like some advice on the approach ...