Internet Information Services (IIS) is a web server application and set of feature extension modules created by Microsoft for use with Microsoft Windows.

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27
votes
3answers
34k views

How to fix SSL 2.0 and BEAST on IIS

As you can see on this post TeamMentor.net vulnerable to BEAST and SSL 2.0, now what? the app I'm currently development got flagged for SSL 2.0 and BEAST by SSL Labs. I'm using IIS 7.0 with the ...
11
votes
6answers
6k 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 ...
11
votes
6answers
2k views

weird visitors to my website

For the last three months I have thousands of real visitors to a single page on my website. Those visits are recorded in Google Analytics and count as page views in adsense reports, but they are fake: ...
10
votes
3answers
14k views

SSL handshake failure modes

In SSL if the handshake is not succesful, does it always end with a handshake alert? Or are there other ways to finish the SSL connection (acceptable by standard). I am asking this, because in an ...
10
votes
3answers
505 views

External websites in logs [duplicate]

I have a website, let's call it www.good.com. I've been getting a lot of requests to www.good.com under completely different URLs than www.good.com. I suspect this traffic is also causing some site ...
10
votes
2answers
699 views

How insecure is PowerShell Web Access?

Windows Server 2012 comes with a new feature that allows you to administrate the server via a PowerShell command line in any modern browser including Smartphones. This sounds cool and scary at the ...
9
votes
3answers
2k views

What is the next step of this file upload attack?

Yesterday I discovered somebody had uploaded this PHP code to my server as a .jpg file via my asp.net MVC application's "Upload your profile picture" form. I believe the attack was unsuccessful for a ...
8
votes
3answers
357 views

Verify a website user is behind corporate firewall?

We have a public ecommerce website hosted at our datacenter onsite. For people who are within the corporate firewall hitting the website I want to display profiling information about the request of ...
7
votes
7answers
6k views

What is the danger of hosting your SSL certificate yourself?

I have Active Directory Certificate Services on my server, which makes it possible for me to deliver an SSL certificate for the websites hosted on the same server. I know that normally, I need to ...
7
votes
2answers
1k views

IIS IP Address Restriction - can I rely on it online?

I've been told that I might have more luck posting here than on Stack Exchange, so here goes: I'm looking for a way to lock down a 3rd party application in IIS. It's a web service, so there's no ...
7
votes
1answer
2k views

What are the security concerns with turning off Extended protection for authentication in IIS7 on ADFS?

In setting up SSO for Office 365, in order to make Chrome and Firefox access services on the Intranet, Extended Protection for Authentication must be disabled on the ADFS sever. As the ADFS server is ...
6
votes
3answers
1k views

IIS and SQLServer Hardening

long story short: I'm an engineer doing development, not administration. I have no direct access to the production server, so I can only tell the administration team the best configurations for ...
6
votes
2answers
58 views

Could an attacker prevent IIS from logging requests

I've had an attacker try to gain access to one of my websites through a form using what looks like a blind SQL inject. It is a huge form, and every possible permutation of values has been tried - in ...
5
votes
1answer
3k views

Does WebDAV pose an unreasonable risk in IIS7.5?

I'm looking for a bit of feedback on WebDAV, in this case running on IIS7.5. I've had an IBM Rational AppScan report come to me with a medium severity finding as a result of DAV entries in the ...
5
votes
1answer
460 views

Hardening SSL/TLS on Azure Cloud Service for A+ on Qualys SSL Labs?

We're using this powershell script as our Azure Cloud Service (PaaS) startup script and we're at an A- on the Qualys SSL Labs test Specifically we're losing points for the following reasons: Forward ...
5
votes
1answer
303 views

What is the security impact of changing PowerShell's PSLanguageMode?

A vendor is asking me to change the PSLanguageMode from within IIS on my Exchange server(s). What potential vulnerabilities am I opening myself up to? I'm surprised to see this option present within ...
4
votes
3answers
408 views

Locking down web-based admin areas with personal SSL certificates

I've been tasked to setup a secure platform, where I've been asked to assign personal SSL certificates to administrators, and have the server only allow persons into the administration areas that have ...
4
votes
3answers
394 views

How can IT audit for installation of IIS Express?

IIS Express is a developer tool for Windows XP and higher which provides the full feature set of IIS, but without needing administrator rights. I've seen discussion by some developers who are ...
4
votes
3answers
9k views

BEAST: IIS6: Failing PCI scan - are these ciphers OK?

Our PCI compliance scanner, TrustWave, have failed our Win 2003/IIS6 site on BEAST because of the following cyphers: Cipher Suite: SSLv3 : DES-CBC3-SHA Cipher Suite: SSLv3 : RC4-SHA Cipher Suite: ...
4
votes
2answers
4k views

Test website for SSL 2.0

I'm in the process of disabling SSLv2 on our IIS-based webserver and am wondering how I can test that SSLv2 is actually disabled? The website is still in development so not visible outside our ...
4
votes
1answer
261 views

Hashed passwords for NTLM authentication

I understood that Windows users' password hashes can be exported very easily. Right? So my question is: If I can have the hashes of other user accounts (e.g. local users on my Windows machine), isn't ...
4
votes
2answers
776 views

how unsafe is it for Windows webserver IIS to have domain privileges

Normally in the past, I've managed that the production server only serves http(s) to the internet, and is isolated from it's database by a firewall which only allows database queries to travel. ...
4
votes
2answers
279 views

With full access to the disk of an IIS web server, could you access the database server?

Here is a theoretical setup: You have a web server running Windows Server with IIS You have a website running here which connects to a database This website can start automatically when the server ...
4
votes
1answer
1k views

IIS 6.0 - mitigating BEAST

Recently, my PCI assessor informed me that my servers are vulnerable to BEAST and failed me. I did my homework and I want to change our webservers to prefer RC4 ciphers over CBC. I followed every ...
4
votes
2answers
4k views

How to display friendly notification about no TLS 1.0 support in browser [closed]

A browser that only has TLS 1.0 support won't be able to establish an HTTPS session with a server that has only TLS 1.1 and TLS 1.2 support. This typically results in a cryptic (to a normal user) ...
4
votes
1answer
96 views

Should I be worried about this url request I received on my site?

I was checking the weekend logs of my IIS server and noticed a strange request which was blocked: ...
3
votes
1answer
1k views

How does Windows/IIS keep a certificate protected or should I never run Apache Webserver on a Windows server?

If I follow the reasoning of a colleague it seems you should never run Apache Webserver or Tomcat on a Windows server if you want to keep the https certificate safe. Let me explain before this ...
3
votes
2answers
205 views

Multiple extension vulnerability. Is this malicious file triggered during form preview or after it has been uploaded?

I'm looking at one of our compromised web server logs and we found that an attacker has uploaded a file with multiple extension. Below is the IIS log. The log format are as below. I have removed the ...
3
votes
3answers
2k views

Need to secure (and add SSL?) RPC port 443 on Win2003 server

So I received an email from my system administrator who wants me to secure a server I own that seems to have a vulnerability in port 443 (which is Windows RPC over HTTPS). Disabling it I know causes ...
3
votes
1answer
209 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, ...
3
votes
1answer
174 views

Clarification on Digital Certificates

I used the makecert tool to create: self-signed certificate client certificate These are the commands I used: makecert -n "CN=MatthewCA" -r -sv MatthewCA.pvk MatthewCA.cer **for self signed ...
3
votes
3answers
107 views

How do I know how a file got onto my computer?

I would like to know if there is any way to know how a file was written onto my server (Windows server) i.e if a file X got written via http or via ftp or by simple network copy or someone manually ...
3
votes
3answers
333 views

Security issues in a Dotnet Web application

I was required to fix three low risk security issues of a Web Application on a Windows 2003 server, NetFramework 2.0, IIS/6.0. It is tracert-able. That may assist for crackers to know network ...
3
votes
2answers
148 views

Website file being altered

I have recently had random spam links inserted into 3 ASP.NET websites. The links are inserted into the physical file so it is not SQL injection attack. The websites have very little in common other ...
3
votes
1answer
291 views

Hardening ciphersuites on Windows Server 2012 R2

I'm currently in the process of compiling a Ciphersuite policy to be used on all of our new WS 12 & IIS 8.5 web servers. In the past I've always manually applied the registry keys into SChannel ...
3
votes
2answers
388 views

Securing Java web services called by web site in DMZ using web services for communication

Suppose you have an application running Java web services in Apache Axis 2. Specifically, these are JAX-WS (Java API for XML-Based Web Services). Currently these web services are on the same Windows ...
3
votes
2answers
706 views

IIS 7.5 impersonation threat?

I am using IIS 7.5 and I want to impersonate users for my different applications in an intranet environnement. To do so, I am considering using the asp.net mechanism with the user/password in the ...
3
votes
1answer
2k views

Securing WCF service with X.509 cert [duplicate]

Possible Duplicate: What is the difference between an x.509 “client certificate” and a normal SSL certificate? I'm getting really confused with WCF and certs. I have a WCF ...
3
votes
2answers
329 views

Windows Authentication to protect API

One of my colleagues has a web api call that is checking that the user is logged in and his token matches what is in session (thanks to all of you for your help). Let's say this is layer blue. After ...
2
votes
2answers
1k views

DirBuster request found in my log files

I was going through the logs of my application hosted on IIS 7.5. I found a request like the following: 2013-08-19 08:14:10 192.168.200... HEAD //DSL/ - 80 - 115.114.27... ...
2
votes
2answers
169 views

Is there any security concern to host Wordpress on the main web server?

We have been hosting our Wordpress blog on a Linux virtual box, and our main web application on an IIS server. Our website is www.mainsite.com and the wordpress is on www.blog.mainsite.com. Now there ...
2
votes
2answers
900 views

PHP on IIS 7.5 Hacked - How do I find and fix the XSS Injection?

I discovered that someone had gained access via FileZilla server software to my Windows 2012 Server. It seems like they had created extra accounts and were trying brute force attempts to get in nearly ...
2
votes
1answer
3k views

What are the consequences of disabling ssl v2 and weak ciphers?

It is my understanding that IIS has ssl v2 enabled by default. Also, TLS 1.0, if enabled, allows for at least one known major vulnerability titled "beast attack". If the weak and vulnerable ciphers ...
2
votes
1answer
502 views

IIS 7 World Wide Web Publishing Service service account

We have a security requirement for IIS 7 (Windows 2008R2) that reads as follows: The service account ID used to run the web site must have its password changed at least annually. ...
2
votes
1answer
483 views

CSR from IIS 8 and Keeping my Private Key a Secret

I've been trying to understand something. When you generate a CSR from IIS, how is the private key kept as a secret, or is it? Do CA's email you a certificate that includes your private key? Because ...
2
votes
2answers
2k views

Is it harmful to allow http requests with very long querystrings in IIS?

I am developing a website with a search feature that could generate HTTP requests that are very long (up to 15,000) characters. However, IIS has a default limit of 2048 characters for querystrings. ...
2
votes
1answer
942 views

Encrypting configuration on shared IIS7 hosting that uses load balancing

When hosting a site on a cluster (or cloud configuration) we need to specify a Machine Key in the web.config file. This is needed to keep the machines in sync (often the first encounter with this is ...
2
votes
1answer
70 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 ...
2
votes
1answer
723 views

Security implications of granting IIS user group folder modify permissions

I have an Application Pool in IIS running under the standard AppPoolIdentity as part of the IIS_IUSRS group. What are the security implications of granting AppPoolIdentity modify and create ...
2
votes
2answers
563 views

Implications of using domain\computername$ account to serve SQL data to IIS

One of our coders is trying to get Windows Authentication to work on a new web app that he's developing (.Net 4.0, MVC, via IIS 7.0/7.5). The application connects to a SQL Server database back-end ...