A web browser is an application which uses http and related protocols to retrieve HTML and XML data from servers. As the web has become a critical source of information and communication, web browsers have become a critical component in information request, transfer, and management.

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28
votes
3answers
9k views

How can a webpage get the MAC address?

I was logged on to my router and filling out some information. I clicked a button and a field was automatically filled in with my computer's MAC address. How is this possible? Does it present a ...
8
votes
2answers
7k views

How to thwart sslstrip attack?

I need help understanding the dynamics of an sslstrip attack. I'm using it to test the security of a site that I own. I can successfully sniff the victim (in this case, myself) credentials over the ...
6
votes
3answers
18k views

Can a website still detect my real MAC address even if I use different virtual machine each time I visit the website?

Suppose I use a proxy and a different virtual machine each time I visit a particular website, will a website still be able to detect my MAC address and/or uniquely identify me? Assume that the website ...
14
votes
4answers
1k views

What is the difference between http and https with a self-signed SSL certificate?

A colleague of mine has told me he doesn't see why there is a warning when visiting a HTTPS website with a self-signed certificate saying that the security may be compromised, but there is no warning ...
11
votes
4answers
1k views

Why isn't OCSP required by default in browsers?

According to the following screenshot, taken from firefox-3.6.17-1.fc14.i686, Firefox has an option to fail closed when unable to connect to OCSP servers. Can someone please explain why this isn't ...
8
votes
3answers
872 views

Are secret URLs secure over HTTPS?

Imagine a service that makes sensitive information available under a secret URL via HTTPS only, without requiring any other authentication. In fact, these are already widespread. What level of ...
8
votes
2answers
3k views

How can end-users detect malicious attempts at SSL spoofing when the network already has an authorized SSL proxy?

I'm working on one client's network where they have enabled HTTPS authority spoofing on their proxy. This allows them to effectively perform a man-in-the-middle attack to decipher all outgoing ...
7
votes
2answers
2k views

Considering that SRP is better than SSH and Basic Auth, how can it be implemented in a website?

SRP is short for Secure Remote Password protocol, and provides a better way for passwords to be sent over the internet. I've read the information at it's Stanford University home page, the Wiki ...
3
votes
1answer
26k views

does Avast SafeZone actually make a difference?

SafeZone is a feature in Avast Anti-Virus which is like a virtual machine that only has a web broswer. The benifit of this is that it can't be infected with spyware and isn't suseptible to keylogers. ...
14
votes
4answers
3k views

TLS 1.0 JavaScript injection vulnerability (BEAST): what to do client-side?

With the alleged SSL/TLS vulnerabilities used by the BEAST exploit, there seems to be a security gap between TLS versions; TLS 1.0 being the problematic one but still the only option for many sites. ...
9
votes
2answers
589 views

RC4 bias protection with padding in TLS

On the answer to my previous question about RC4 vulnerabilities in TLS, Thomas Pornin gave a great answer, in which he said: One way to "fix" RC4, which has been suggested many times, is to drop ...
4
votes
3answers
404 views

Security of a Windows XP system after April 8th when running the latest Firefox or Chrome

As we all know, Microsoft stops developing security patches for Windows XP very soon. If a bug in the kernel was to be found that would allow an attacker to take control by, say, sending a specially ...
2
votes
2answers
379 views

Protecting websites from outdated browsers and plugins via a whitelist/blacklist combination?

Aside from using browser headers, I want to blacklist/whitelist browser and plugins from my site so that I can prevent these older unpatched systems from (1) being a general user of my site (2) ...
-5
votes
1answer
150 views

How to avoid DDoS Attack [closed]

I buy my train ticket from our railway local web site. When ticket open for sale on web site then web site original traffic remain 50 (Just an example). Our railway web site is attacked by DDoS for ...
8
votes
5answers
3k views

What do the various browser “private modes” do?

Recently there has been some disagreement as to what "private mode" means when it comes to various browsers. Primarily I am referring to... IE's "InPrivate Browsing" Google Chrome's "Incognito ...
5
votes
1answer
256 views

What issues might exist with TLS-OBC's emulation of Browser Certificates?

TLS-OBC is an RFC proposal that increases SSL/TLS security by using certificates on both ends of the TLS connection. What's special here is that the client is permitted to dynamically create a local, ...
3
votes
1answer
253 views

What servers or clients are immune to related-domain cookie attacks? (*.example.com)

In this question, I want to identify browsers, servers, or implementations that are immune from related domain cookie attacks (e.g. a.example.com vs b.example.com). Lacking any tangible solution, ...
3
votes
3answers
1k views

sslstrip vs. privoxy redirect rule on clients

I watched this video: http://www.securitytube.net/video/193 Now I'm thinking about an example. Suppose I have a privoxy proxy on my PC: user.action file (just part of it): { ...
2
votes
3answers
889 views

Is it possible for a virus or unknown program to automatically start up a webcam

How can I secure my computer more, knowing these days that there are many websites, especially ones where you don't have to even click before a virus is downloaded straight to your hard-drive. I ...
1
vote
1answer
252 views

How to check whether a link is safe or not? [closed]

I've been working on a task to find threats in a social network called Skyrock. For which, I've managed to retrieve a significant amount of URLs by crawling various user profiles and parsing the data ...
1
vote
1answer
151 views

Closed Internet Explorer inprivate trace

Suppose that a user uses inprivate mode in Internet Explorer and browsed something. Now, an administrator wants to search the user's activity in Internet Explorer using the user's PC without having ...
103
votes
5answers
3k views

How can I protect myself from this kind of clipboard abuse?

Clipboard abuse from websites Many websites use JavaScript or CSS to stealthily insert or replace text in the user's clipboard whenever they copy information from the page. As far as I know this is ...
132
votes
9answers
74k views

Is Adblock (Plus) a security risk?

My email-provider's website (http://www.gmx.de) recently started linking to the (German) site http://www.browsersicherheit.info/ which basically claims that due to its capabilities to modify a site's ...
30
votes
4answers
40k views

Why is passing the session id as url parameter insecure?

I recently followed a discussion, where one person was stating that passing the session id as url parameter is insecure and that cookies should be used instead. The other person said the opposite and ...
23
votes
9answers
6k views

Is encryption in HTTPS done by the browser or by the system?

This may be a common sense question, but I am not able to find any documentation on this after searching on google for a long time When browser makes a HTTPs request, does it encrypt the data then ...
31
votes
4answers
6k views

How to fight browser fingerprinting?

https://panopticlick.eff.org/ , aka "How unique and trackable is your browser". For example it usually gives me a unique score. The biggest entropy values come from navigator.plugins and fonts via ...
42
votes
12answers
6k views

Why should I care if a site uses encryption or not if I'm not exchanging any sensitive data? [duplicate]

Lots of sites these days, that don't deal with sensitive data, enable encryption. I think it's mostly to make (paranoid?) users feel safer. In cases where there is a user's account being logged in, ...
24
votes
6answers
6k views

How can I prevent tracking by ETAGs?

An ETAG is a HTTP header that is sent-behind-the-scenes between a web browser and an web server. This value is intended to control how long a particular file is cached on the client side. There is ...
8
votes
4answers
25k views

Advanced techniques for detecting a proxy/getting original IP

In what manner can a website detect my original IP address, even though I'm using a proxy server? I've noticed this with a few sites. There are four proxy methods I've used: Firefox with a proxy ...
34
votes
4answers
12k views

Can web sites detect whether you are using private browsing mode?

Most modern browsers support "private browsing mode" (also known in Chrome as "Incognito mode"), where the browser does not save any information to disk about your browsing while in this mode. In ...
17
votes
4answers
7k views

Should sensitive data ever be passed in the query string?

Should sensitive data ever be passed via the query string as opposed to the postback? I realize that the query string will be encrypted, but are there other reasons to avoid passing data in the ...
19
votes
3answers
17k views

Why is 'avast! Web/Mail Shield Root' listed as CA for google.com?

I just noticed something weird in my browser: the certificate for www.google.com has been issued by avast! Web/Mail Shield Root. Should I be worried? I am using avast! Antivirus so it's probably a ...
19
votes
4answers
3k views

Why does Facebook serve several SSL certificates?

Facebook seems to be alternately serving two SSL certificates, one from DigiCert and one from VeriSign. There are only two reasons for this that I can think of: They're in the middle of a ...
11
votes
2answers
532 views

What should I look for when auditing a Firefox extension / plugin?

I've been asked to do a security audit on a Firefox add-on developed by a third party. I am a web developer with a reasonable grasp of JavaScript but am not a browser security expert. What kinds of ...
8
votes
5answers
2k 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 ...
7
votes
3answers
3k views

SQL Injection How to inject Clean/Rest URLS

I have a question I'm hoping you could help me with? Unclean url's: http://example.com/index.php?page=foo http://example.com/products?category=2&pid=25 ...
6
votes
3answers
7k views

Force a connection via SSL3 to detect POODLE vulnerability

I have been reading up on the POODLE vulnerability. From my understanding, and correct me if I am wrong, you need to allow connections to be made via SSLv3 on the server. The server I am currently ...
24
votes
1answer
3k views

Why would the BBC web site always ask for a personal certificate, and how do I avoid giving it away?

After installing a CAcert personal certificate, every time I land on the BBC weather site it asks me to identify myself with a certificate. Why would any non-malicious web site do that unless I've ...
12
votes
5answers
2k views

Is clipboard secure?

Can a browser get the data on my clipboard? Data could be for example my temporary password? Any browser or operating system that allows this?
4
votes
2answers
3k views

Does Java applets reveal the real IP address, even when using proxy or vpn?

Can a Java applet reveal the original client IP address, when browsing through a proxy or a VPN? Why?
15
votes
1answer
655 views

Does Gibson's fingerprinting service add much additional security?

I just read this post and it proposes a method of storing SSL fingerprints online so that you can double check that your certificates have not been tampered with. But is it really relevant or useful? ...
12
votes
6answers
797 views

Can a website determine what OS or webbrowser a visitor is using if the useragent is blanked/changed?

Assume that a visitor to a website has changed his useragent to something like the following, but he's using linux: Mozilla/5.0 (Windows NT 6.2; rv:20.0) Gecko/20121202 Firefox/20.0 Assume that the ...
11
votes
6answers
10k views

Why are iframes allowed at all in modern browsers?

I read a number of IT security blogs (though I'm no security expert), and it seems a significant percentage of exploits in the wild are delivered through adding malicious iframes to a hacked website, ...
11
votes
5answers
12k 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 ...
8
votes
1answer
545 views

How safe is “trust this computer” option for websites?

Many sites have a "trust this computer" option that allows one to bypass some security measures (ex.: with Google's 2-step authentication enabled, one does not need to enter the phone's code if the ...
8
votes
1answer
9k views

Does Google Chrome protect against cross site scripting (XSS)?

In Firefox I've been using the NoScript extension to protect myself from certain kinds of malware attacks. NoScript is well known as a very powerful extension for Firefox and introduced protection ...
6
votes
3answers
186 views

Same Origin Policy - XHR response

I know that Same Origin Policy (SOP) prevents a page/script from one origin to read response from another origin, but it does not prevents the page/script from making a XMLHttpRequest (XHR) request to ...
5
votes
4answers
13k views

Security issues using iframes

We are looking to move to iframes due to technical challenges. By moving to iframes it will be easier to manage the technical issues. But we are not totally sure of security implications of iframes. ...
5
votes
4answers
4k views

Browser hijacked - how to fix and prevent?

For the second time in a month, my work PC has been infected with malware that is hijacking my Google search results in Firefox. A search for the URL hijacked searches end up at turns up nothing on ...
21
votes
4answers
2k views

Why doesn't the client's web browser need to be PCI compliant?

A hypothetical online store that accepts credit card payment will have to be PCI compliant because it receives (transmit), process and possibly store credit card numbers. But the client's web browser ...