Questions tagged [asp.net]

ASP.NET is a Web application framework developed and marketed by Microsoft to allow programmers to build dynamic Web sites, Web applications and Web services.

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20
votes
3answers
9k views

What risks do Cookieless sessions have? What are the mitigations?

I'm debating if I should support cookieless sessions in my web app. It would look something like this: http://www.example.com/(S(lit3py55t21z5v55vlm25s55))/orderform.aspx Since the URL is never ...
-3
votes
1answer
12k views

Hown I can test “Microsoft ASP.NET Forms Authentication Bypass” in ASP.Net 4.0.30319

I searched in google for "ASP.Net 4.0.30319 vulnerability " keyword. finally,I found "Microsoft ASP.NET Forms Authentication Bypass" in below link: http://dl.packetstormsecurity.net/1203-exploits/SA-...
2
votes
1answer
1k views

What happens when CA server is down?

Let's assume that I have a server which accepts requests over HTTPS. The server resides in a closed environment, and relies on a local CA server. I am not sure if this is relevant, but the server is ...
3
votes
2answers
18k views

IIS Host Header Attacks

Is IIS and ASP vulnerable to the same Host Header Attacks we have seen on Apache and Nginx? Specifically the attacks that use the HTTP Host Header to reset a password or implement web-cache poisoning. ...
2
votes
2answers
358 views

Is this ASP site vulnerable to XSS or not?

I took a scan of a ASP site and it said that request validation was off. It caught it by sending a URL of example.com/?foo=<script> and received a response URL of example.com/?foo=<script> ...
11
votes
2answers
2k views

How reliable is ASP.NET's Request Validation feature?

ASP.NET offers an extra layer to protect your application from XSS attacks and injection in general which is called Request validation. On their official topic, they mention that: Even if you're ...
4
votes
3answers
3k views

Create a page to experiment with SQL injection [closed]

This semester, I have taken a course on Information Security and my project for this course is to implement an SQL injection to obtain admin privileges. For this I first download Havij software (...
2
votes
3answers
2k views

Is there a way to steal PHP or ASP code from a web server through the HTTP(S) protocols?

I am working on a web application that would include some custom development and got a bit concerned about code theft. So the question I wanted to ask is whether it is - generally speaking - possible ...
2
votes
2answers
469 views

Can two users share the same Request.UserHostAddress?

I am working on an ASP.NET MVC-5 web application, which is available to public users (no login is required). And I need to prevent the same user from submitting more than 5 "contact us" requests ...
5
votes
1answer
21k views

How client certificate works for authentication (in Web API)

I have been working on this scenario for a week. I have implemented the code to authenticate client certificate using this link: http://www.asp.net/web-api/overview/security/working-with-ssl-in-web-...
18
votes
1answer
36k views

Where to store access and refresh tokens on ASP.NET client web app - calling a REST API

I've made a Web API in ASP.NET that acts as the entry point into a SQL Server database for report data. This service has a "token" endpoint that authenticates a user via ASP Identity and return a 20-...
1
vote
1answer
84 views

Is it worth reporting a asp.net runtime error? [closed]

I found a runtime error on united.com. Is it worth submitting? The exception doesn't seem to show any identifiable information.
3
votes
3answers
7k views

How does a website owner decrypt ASP.NET's Viewstate, and cookies

I'd like to audit my viewstate for information I don't want to be sent down to the client. What are the steps needed to decrypt this information into human readable form? How would I decrypt the ...
5
votes
1answer
561 views

How did the Code Red worm work?

So I've been reading a bit about the Code Red worm, and I get the gist but the overflow string doesn't make sense to me. From this site, it says that the overflow string the worm used was /default....
1
vote
1answer
777 views

Is it possible to execute Server Side Scripts despite Content-Type header?

Say, there's an upload function where users are supposed to upload images only. However, it's possible to upload arbitrary files bypassing the restriction. Say, I uploaded a shell (aspx) and ...
2
votes
0answers
484 views

Is XSP suitable for Internet facing, production hosts? (either self hosted, as an Apache plugin, or FastCGI)

XSP is portable version of ASP.NET that allows for operation on OSX, Linux, and Windows. It's an alternative to IIS, and hosts its own web server, or can plug into existing web servers such as Apache....
3
votes
1answer
791 views

Use RSA Encryption With ASP.NET

My goal is to implement asymmetric encryption in an ASP.NET website to secure user-entered Social Security Numbers. I want to encrypt the SSNs with a public key, and only display a masked version, to ...
2
votes
0answers
814 views

Is it possible to exploit an image field in which I can upload any file? [closed]

I'm pentesting this web application developed in ASP.NET. I've found that I can upload any file as profile photo. When I later visit the profile page the site tries to display it like this: <img ...
12
votes
6answers
9k views

Is this a ViewState attack?

I recently found this request in the event log: Client IP: 193.203.XX.XX Port: 53080 User-Agent: Mozilla/4.0 (compatible; Synapse) ViewState: -1' Referer: Now, the ViewState: -1' part combined with ...
1
vote
2answers
2k views

ASP.NET session id strength

After reading this and this, I am wondering if it is considered secure to use the default ASP.NET sessionID as a means to authenticate the user. I know it would be better to implement ASP.Identity, ...
2
votes
2answers
1k views

Security of an SQL database server used in web app

At my organisation we have a website survey that one of the managers here uses for equality purposes. They designed and implemented the survey in Adobe FormsCentral which is now being retired, so I ...
3
votes
2answers
551 views

Best practice for identity management methods with regards to confirming user existence

I'm working on a new site that uses asp.net identity to register users. I'm making use of email addresses as usernames and the email address has to be confirmed before the user can log in. I've been ...
1
vote
1answer
499 views

Machine certificates for accessing a web app in IIS only from an specific PC client

We have an ASP.NET web app running in IIS, with about 200 users, some are inside our LAN and other ones are outside our LAN. Every user has a userid account and a password to login. Besides those ...
1
vote
2answers
579 views

Securing user supplied files in IIS

I have an Internet website running on IIS/Windows configured as follows: The website is publicly accessible for visitors to browse. A user can login and upload files. The user will be able to see ...
0
votes
1answer
625 views

Security benefits to have IP-filter in HttpModule instead of Page-Load in asp.net pipeline?

I'm working on implementing an IP-filter which blocks all requests by machines outside our IP-range. This is for an asp.net project (written in c#). I've read on multiple forums that the safest way ...
2
votes
1answer
644 views

Client side certificates in IIS for accessing a web app only from an specific PC

We have an ASP.NET web app running in IIS, with about 200 users, some are inside our LAN and other ones are outside our LAN. Every user has a userid account and a password to login. Besides those ...
5
votes
1answer
221 views

Client Certificates

After countless hours of reading I have come to the find that mutual authentication via client certificates seemed to be a viable and appropriate solution for the following scenario. I have a ASP....
9
votes
1answer
2k views

Is it unwise to use Redis to store PII, private keys, and other secrets?

I'm reviewing a system that is using Redis to store all client secrets, private keys, and other things. The problem is that Redis loads the entire DB into RAM Since SSL's heartbleed, Rowhammer, and ...
1
vote
1answer
250 views

User Authentication for a public website in 2015 [closed]

I am creating a new website for online shopping in .net and was wondering if i have another option beside Forms authentication to validate the users in a safe and secure way (this has been around for ...
1
vote
1answer
2k views

How do I prevent tampering with form submission data, and changing the details for any account?

Although this is something that only employees can use, I'd like to prevent the tampering anyway. I don't like insecure code, and this is hideously insecure. Here's an example link: <a href="#' + ...
9
votes
4answers
954 views

Worthwhile from security standpoint to limit database server user for ASP.NET website to only EXECUTE on stored procedures?

I know that obviously we must avoid sql injection attacks through user input validation and parametrized queries. There's already a firewall in place on the database server to limit remote ...
1
vote
1answer
230 views

What is the best way to track the authenticated user on the server side? [closed]

For a web app, the client side is javascript in the browser. The server side is ASP.NET with a REST API. At present there is a single server but we plan to scale out with a server each in the US, UK, ...
7
votes
3answers
2k views

How to encrypt all existing customer passwords [closed]

I work for an online shop and since I worked here we have stored customer passwords in plaintext. I joined the company as a data inputter and when I discovered that we did this I flagged it up with ...
8
votes
1answer
1k views

CSRF in ASP.NET

There's this "change password" ASP.NET form that has both event validation and viewstate enabled. There are no specific anti-csrf tokens. From I understanding, in order to execute a successful CSRF ...
1
vote
2answers
2k views

Is string concatenation vulnerable to null character in aspx?

I just see this line of code in VB in one file .aspx FileUpload.SaveAs(sPath & "/" & FileUpload.FileName) This line save a file that an user uploaded. It use the SaveAs method. I was worried ...
4
votes
3answers
244 views

Does PHP have a XSS API?

ASP.NET has a cross site scripting API by default, however does PHP have a cross site scripting prevention API?
4
votes
2answers
595 views

Placeholders for cshtml — ASP.NET

I'm learning Application Security, and tutorials such as www.asp.net discuss updating databases with placeholders, instead of directly using user input @{ var title = ""; var genre = ""; ...
-1
votes
1answer
381 views

Measures that must be taken to protect online banking website [closed]

I building an online banking service in ASP.NET and my objective is to implement all possible security measures. Currently at database level I am using RES 2048 bit encryption to encrypt database ...
0
votes
1answer
3k views

Is the ASP.NET .ASPXAUTH cookie value always the same for a given user? [closed]

Is the ASP.NET .ASPXAUTH cookie value always the same for a given user?
-2
votes
1answer
741 views

Home PC has been compromised remotely and even after cleaning my PC repeatedly, the problem still comes back, help please? [closed]

I'm a regular guy running two small franchise businesses with a basic understanding of computers etc, (very basic really), but I am certain my home network has been hacked and I am finding lots of new ...
1
vote
1answer
164 views

How can I compute the value of the ASP.NET forms authentication cookie?

How can I compute the value of the ASP.NET forms authentication cookie?
4
votes
1answer
5k views

Calling JavaScript functions from within a Style tag XSS

I've identified an XSS in a client's application where they've failed to properly sanitize a variable. The application, however, is written in ASP.NET 2.x and they have request validation turned on. ...
2
votes
2answers
804 views

ASP.NET SqlDataSource injection risk

I have an internal website (going on the intranet) that is going to go through vigorous testing to make sure that it is secure, so I am battening down the hatches so to speak and I coded a .NET ...
6
votes
1answer
1k views

Does encrypting a setting in web.config actually provide security?

Does encrypting a value in the web.config file actually provide any real protection? It seems to me that any web app can read that setting. Yes that's more work than just reading the web.config file, ...
6
votes
1answer
4k views

How should I mitigate the XSS vulnerabilities in KnockoutJS described at mustache-security?

The site Mustache-Security describes XSS vulnerabilities in KnockoutJS... The vulnerabilities come from the use of eval (or some equivalent) to convert text in the data-bind attribute to executable ...
4
votes
2answers
2k views

Possible arbitrary file download vulnerability

I am auditing a possible vulnerable piece of ASP code on a Windows environment. The code is as follows: If InStr(strPath, "\Only\Download\From\Here\", CompareMethod.Text) = 0 Then Basicly it is ...
0
votes
1answer
108 views

Does ASP.NET guarantee the integrity of a page's controls on a post back?

Say you have an ASP.NET page that lists the prices for certain items in labels. I know it's cringe-worthy, but say you took the price of the item from the label on the page to determine what the user ...
0
votes
1answer
4k views

How do I inject JavaScript into a JPG image and execute it when uploaded?

I've recently joined a security project, and received a task to demonstrate the risk related to an end-user uploading an image containing embedded (malicious) JavaScript code. I used EXIFeditor to ...
1
vote
2answers
1k views

I can upload any file to an ASP webapp/IIS server but I do not know where (which folder), is this exploitable?

I'm able to upload any file to an ASP webapp/IIS server. My first though is to upload an ASP shell but I don't know where the file has been uploaded. I have written a Python script that beggining ...
4
votes
1answer
899 views

VB.NET stored procedure implementation?

While reviewing code for a vb.net application I have come across the following implementation of stored procedures using ExecuteDataSet Result = DBInstance.ExecuteDataSet(Name, paramArrayList....