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

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4
votes
2answers
616 views

Attack vectors in POSTing variables from one php script to the next?

I have an application which is structured in the following way for its signup page. After this signup, the user is directly granted access into the system - there is no email verification (as ...
15
votes
4answers
5k views

How to implement non-password authentication in a web site

In an answer to this question about pw reset, D.W. says: Lastly, consider non-password authentication. Passwords have many problems as an authentication mechanism, and you might consider other ...
13
votes
4answers
632 views

How to protect off-the-shelf web applications?

As an exercise, please consider the following: If you are faced with having to deploy off-the-shelf web applications that you are unsure about the vendors security coding practices, which techniques ...
92
votes
3answers
16k views

Is a rand from /dev/urandom secure for a login key?

Lets say I want to create a cookie for a user. Would simply generating a 1024 bit string by using /dev/urandom, and checking if it already exists (looping until I get a unique one) suffice? Or should ...
25
votes
9answers
2k views

Why do some people really hate security via client-side?

For instance, lets look at a common login system for a website HTTPS connection is made User submits credentials via POST Server-side code hashes the password and looks if it matches the user name ...
5
votes
6answers
1k views

How to defend vs. Image Remote File Inclusion, e.g. RFI using a .gif file (Apache/PHP)?

To defend versus Remote File Inclusion where attackers try to abuse image files, I usually recommend to never use include to include image files into PHP code. Sometimes though, the avoidance of ...
4
votes
2answers
2k views

How to protect from new Javascript Injection technique that doesn't use eval()?

There is a new Javascript injection technique that is generating chatter on the forums mentioned here Here is the code sample: String.prototype.code = function(){ return (new Function('with(this) { ...
6
votes
4answers
564 views

What abuses can an infected webpage do to me if I'm using Chrome and Flash is disabled

as a follow-up to this question Can you get virus just by visiting a website in chrome., I've read these pages: http://www.straightsectalk.com/?p=47 ...
9
votes
2answers
649 views

Recent Facebook XSS exploit details

There was a recent XSS exploit on Facebook that posted a vulgar message and got users to click on a link to spread the payload. What vulnerability was exploited, and what can other sites do to avoid a ...
5
votes
2answers
167 views

Protection against synthetic queries

Note: One, I am not sure if synthetic queries is right word for the risk I am talking about. Second, though I am considering 3-tier model of web-applications general answers are welcome in ...
57
votes
7answers
20k views

SQL injection — why isn't escape quotes safe anymore?

Raw SQL When you're writing SQL -- for anything that takes human input really, a lot of things have been done to avoid the injection. Everyone that's heard of SQL injection knows that (I'm going to ...
3
votes
1answer
2k views

Are there any tools for automated penetration testing of Silverlight applications? [closed]

I'd like to find a tool to assist with automated penetration testing of Silverlight applications, in a similar vein to AppScan for webapps. Specifically, I'm looking for a tool that can cope with ...
3
votes
3answers
153 views

Encrypting a fixed format message with commands and transmitting over the internet

Linked to: Encrypting a fixed format message? I need to communicate from Site A, a set of information that will be presented to users of Site A, which when they choose to submit, should travel to my ...
4
votes
3answers
491 views

It is safe to buy a domain if I get this message in Firefox?

Greetings, I want to buy a domain name from a big registar(well known on the internet) but when I go to checkout I see that my link is going from full encrypted to “Connection Partially Encrypted” ...
3
votes
3answers
343 views

How do you make sure a pdf is deleted after being viewed in the browser?

For things like images or html documents, cache headers make sure that the data is deleted when the browser is closed. However as PDFs are opened in a plugin, the cache headers do not seem to have the ...
3
votes
2answers
215 views

Encrypting a fixed format message?

I'm planning to send across TWO pieces of information over the internet from machine A A site identifier which will be like: $SiteName = "EXAMPLE" (in plaintext) Encoded text which will be like: ...
1
vote
2answers
1k views

Thoughts on Tiny Encryption Algorithm (TEA, anyone)?

I'm planning to implement Tiny Encryption Algorithm and exchange data between two PHP sites. Specifically, using the code presented at PHP-einfach.de Does anyone have any experiences / thoughts / ...
1
vote
1answer
985 views

Securing clients side scripts [duplicate]

Most browsers allow users to view the source of a web-page quite easily and modern even provided detailed analysis. Often this code includes critical client side scripts in the form of JS/jQuery, ...
6
votes
3answers
213 views

What indicators did OWASP use to end up with OWASP Top 10?

I was asked by a student how OWASP Top 10 are ranked, based on which indicators: is it severity? ease of exploit? ease of implementing their countermeasures? ... Knowing that each of these ...
8
votes
2answers
1k views

MIME sniffing protection

As it is known, older versions of MSIE (before 8) have a nasty habit of treating images as HTML if they "look like" HTML, which can lead to nasty vulnerabilities for sites that allow people to upload ...
5
votes
2answers
919 views

What is more secure: Many subdirectories, or many subdomains?

I have 3 websites that could be configured as a "VirtualApplication" in servicedefinition.csdef: www.mydomain.net/enroll www.mydomain.net/admin www.mydomain.net/ ... or I can configure them as a ...
15
votes
4answers
1k views

Web Security Cheatsheet / ToDo list

Can anyone suggest a cheatsheet or ToDo list of web site and application security? A local small business owner prompted a question about web security, basically her company website just got XSS ...
5
votes
2answers
1k views

Generating one-time tokens from API-key?

I have a web-site for which I'm building a Drupal module that allows the users of that Drupal site to navigate to my web-site directly from the Drupal site. I intend to distribute secret API-keys to ...
4
votes
2answers
190 views

What is the benefit of combining different web log files with different formats?

What is the benefit of combining different web log files with different formats in terms of web application security? In other words, how does combining iis log file with apache log file help in ...
5
votes
3answers
613 views

Web server file sniffing

What is it called when a user tries several attempts to figure out the files and folder structure on a web server? For example, the attacker will run http://example.com/test.jpg to determine if ...
5
votes
3answers
445 views

Is Content Security Policy an approach that is worth to support?

Mozilla Firefox 4.0 supports something called Content Security Policy that disables the interpretation of embedded Java Script. Only external Java Script files that are referenced using a script tag ...
5
votes
7answers
439 views

Malicious Websites

Just wanted to get everyone's opinion on this. In Information Security, you get various alerts about particular machines on your network going to sites and/or IPs that have been flagged as ...
0
votes
2answers
563 views

AntiXSS for ASP.NET 1.1

Unfortunately, a client of mine still has an application based on ASP.NET 1.1. Yes yes, I know - horribly insecure, support ending, and on and on... I've already been through that with them. ...
4
votes
2answers
990 views

P3P HTTP Headers and Session ID's

Is there any chance that Session ID's can be shared between different websites (one in other IFRAME of others) through P3P Headers?
9
votes
3answers
9k views

What SSL key should I make for IIS: RSA or DH? What bit length is appropriate?

I'm creating an SSL cert for my IIS server and need to know when I should choose the Microsoft RSA SChannel Cryptographic Provider or the Microsoft DH SChannel Cryptographic Provider. Question 1 Why ...
5
votes
2answers
2k views

When should I not use CSRF protection for a form?

By default, I have CSRF protection for all my forms using a token. However I noticed another web application that has a similar function to one of my forms. ANd they did not use CSRF token. So I ...
14
votes
4answers
4k views

Is AJAX fundamentally insecure?

Possible Duplicate: How to do Ajax securely? At my workplace many people believe that AJAX is fundamentally insecure. I am under the impression that AJAX is exactly as secure as any other ...
9
votes
3answers
1k views

How do I secure my SaaS startup?

I came across this question I like to offer my startup also for security advice. Objective: building a SaaS web application that allows businesses to quickly open up online stores akin to Yahoo! ...
0
votes
4answers
184 views

Safely changing text links to HTML anchors

I'm trying to change text links to real anchors. So for example I want to change http://example.com to <a href="http://example.com">http://example.com</a>. Since this is a user given ...
2
votes
2answers
697 views

What CSS is considered Safe or Unsafe within a multi tenant website?

I'm reading the Azure Patterns and Practices multi-tenant guidance and in there it says Cascading style sheets Behaviors are one feature that the Surveys site will not support. What CSS ...
4
votes
2answers
205 views

What boxed solutions exist for taking care of Authentication? Mostly focused around websites

The Internet is generally plagued by websites that break basic rules of security, then there's a middle tier where website try to secure passwords... but they do it incorrectly. And finally, there's ...
11
votes
8answers
3k views

What chars should I not allow in passwords?

I am planning to develop a website that require that the users register a username and a password. When I let the user choose a password, what chars should I allow the users to have in the password? ...
18
votes
4answers
18k views

How to hijack a session?

Despite the blatant title of the question, this is actually for a genuine purpose. My site uses PHP code like this: $select="select id from tableA where user_id='".$_SESSION['sess_user_id']."'"; ...
1
vote
2answers
2k views

Should CSRF 'Double Submit Cookie' technique have a different seed value for the cookie versus the HTTP POST?

I'm reading about the OWASP double submit cookies method of protection and there it states that the cookie value between the header and form should match. That seems to be somewhat of a risk, as the ...
3
votes
3answers
2k views

Altering a $_SESSION variable in PHP via XSS?

Not sure if what I'm saying makes sense... but is it possible for me to alter a $_SESSION variable from outside the target PHP script? One of our scripts uses a $_SESSION variable and I'm not sure if ...
1
vote
1answer
235 views

Replicating javascript actions from different website (XSS?)

I've got html / javascript code on my site like this: <a ...
75
votes
8answers
9k views

Can anyone provide references for implementing web application self password reset mechanisms properly?

We are implementing self password reset on a web application, and I know how I want to do it (email time limited password reset URL to users pre-registered email address). My problem is that I ...
7
votes
4answers
917 views

Security attacks on PHP web applications

I know about following security attacks on php applications (html,php,js). XSS SQL Injection CSFR Session Hijacking /Fixation Code Injection Remote file injection Should i know about any other or ...
5
votes
1answer
717 views

Good Security tool for PHP- Suhosin vs Spike vs PHPIDS

Do I have to check/test my code beforehand, or do these tools inform me when an attempt is being made in real time? Secondly, which one should I go for -- Suhosin or Spike or PHPIDS or a combo? What ...
6
votes
2answers
671 views

What a programmer should know before their web service's client audit

Situation: I have created a WS client (.net wcf) for the customer that access a third party web service (Websphere). This WS uses HTTPS and I get a certificate from WS vendor. All works fine, I have ...
-1
votes
2answers
504 views

What can one define as quality criteria for an XML Schema?

One of the usage of Input validation, is to be protect against XSS. In case one would need to define best practice for the functions validating the input, then some (which I am calling quality ...
5
votes
1answer
303 views

How much protection does the Kill-Bit provide for ActiveX controls?

I have some ActiveX controls that are not supposed to run in the browser but only in my particular Front-End. I know that by setting the Kill-Bit I disable their execution in Internet Explorer and MS ...
20
votes
5answers
1k views

Why do some websites and programs restrict password characteristics?

There are some websites and even programs that I use that have rediculous password restrictions. Lots of forums for instance restrict passwords to ~32 characters. Others enforce a restricted charset. ...
16
votes
3answers
26k views

How to ensure that cookies are always sent via SSL when using ASP.NET on IIS 7.5?

Firesheep has brought the issue of insecure cookie exchanges to the forefront. How can you ensure that all cookie exchanges are forced to occur only via an SSL-secured connection to the server when ...
7
votes
1answer
427 views

how to configure edit-restricted mediawiki

I am planning to setup a public wiki using mediawiki, but I never used mediawiki for a public site before and I am not experienced with it, even as a user. I am planning to create a very restricted ...