Questions tagged [web-browser]

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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276
votes
3answers
22k views

How did “tech-supportcenter” phishers trick Google?

Related: Is the Web browser status bar always trustable? How can Google search change the location in a URL tooltip? I've always thought you can "hover" over a link to see where it really goes, ...
243
votes
5answers
19k views

Is the save button delay in a Firefox download dialog a security feature? What does it protect?

When I click to download a file through Firefox, a dialog window appears asking me whether I want to save the file somewhere or open it immediately once downloaded. The OK button in the dialog window ...
174
votes
7answers
11k 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 ...
166
votes
9answers
195k 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 ...
139
votes
11answers
85k views

Is visiting HTTPS websites on a public hotspot secure?

It's often said that HTTPS SSL/TLS connections are encrypted and said to be secure because the communication between the server and me is encrypted (also provides server authentication) so if someone ...
135
votes
4answers
70k views

Why is the same origin policy so important?

I can't really fully understand what same origin domain means. I know it means that when getting a resource from another domain (say a JS file) it will run from the context of the domain that serves ...
133
votes
2answers
13k views

What is 'tabnabbing'?

Wikipedia is not very explicit on this, The exploit employs scripts to rewrite a page of average interest with an impersonation of a well-known website, when left unattended for some time. What ...
105
votes
4answers
60k views

What is the website checking about my browser to protect the website from a DDoS?

Some sites I visit take me to a page that says roughly, "Checking your browser before accessing example.com. DDoS attack protection by CloudFlare". What exactly about my browser is being checked and ...
100
votes
5answers
52k views

Should websites be allowed to disable autocomplete on forms or fields?

Currently, there is an HTML form/input attribute called autocomplete, which, when set to off, disables autocomplete/autofill for that form or element. Some banks seem to use this to prevent password ...
97
votes
8answers
11k views

Do we need to logout of webapps?

A quick Google search doesn't reveal whether it is important to logout of webapps (online banking, Amazon, Facebook, etc.), or if I am safe just closing the tab or browser. I am sure I heard on some ...
90
votes
4answers
11k views

Is browser history an important factor when considering security?

I discovered something I consider a major vulnerability in a SaaS product that includes the username and password in the query string of the URL on registration and every login attempt. The technical ...
85
votes
5answers
21k views

Can “Accept cookie” button in a website be malicious?

I don't remember when this "accept/cancel cookie" button started to be used in websites. Why do they insist on getting users to click on this button? Can it do any harm to user's PC or to collect ...
85
votes
8answers
14k views

What attacks are made possible by public release of my web history?

Assume that my Internet history is made public (accidentally or on purpose). And this release is over 24 hours since the visits were made. Also, assume that there aren't embarrassing sites on there: ...
74
votes
10answers
19k views

Why is JavaScript “safe” to run in the browser?

JavaScript has certain limitations such as preventing reading and writing to disk and not allowing access to other browser windows or domains. But is that all that's needed to prevent malicious code ...
70
votes
7answers
33k 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 ...
66
votes
8answers
17k views

Why use HTTPS Everywhere when we have HSTS supported browsers?

I know that the browser's default protocol to access any site is http:// when https:// is explicitly not mentioned, but even then if we browse to a website say www.facebook.com, the response header ...
65
votes
6answers
12k views

Are there objective reasons to not allow Google Chrome extensions, but to allow Firefox extensions?

Recently, the company I work for has forbidden usage of any extensions in Chrome. They also do not allow account sync. This affected virtually all Web developers since they use Chrome to test their ...
65
votes
4answers
9k views

Is an up-to-date browser secure on an out-of-date OS?

Windows 7 support will end on January 14, 2020. Assuming that after that day I still use an updated browser, is it true that I'm still safe? Can it "patch" the OS-based security holes? Minor question:...
64
votes
2answers
8k views

Are EU cookie consent forms safe? [closed]

Does the EU consent form system pose a new security risk? Today we have to click OK on about 20 cookie consent forms every week, where previously we could mostly dismiss internet forms as being ...
63
votes
6answers
27k 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 ...
61
votes
4answers
356k views

How to determine if a browser is using an SSL or TLS connection?

I want to know whether my browser is using SSL or TLS connection if I see HTTPS. I want to know for IE, Firefox, Chrome and Safari. I want to know the protocol version.
61
votes
1answer
4k views

“Allow __ to be fullscreen?”

I have been asking myself for a while what's the purpose of that popup showing up in pretty much all the modern browsers upon entering the full-screen mode of a video or website. It appears to be a ...
60
votes
8answers
17k views

How can I securely develop a local webapp at a coffee shop?

When I'm developing a webapp, let's say a Django site, I run it locally and typically access it at http://localhost. I thought this was inherently secure because I assumed that localhost can only be ...
59
votes
2answers
83k views

Why do browsers enforce the same-origin security policy on iframes?

I did a small test on Chrome (V37) today. I created a small page and loaded it to the browser: <!DOCTYPE html> <html> <head> <title>Untitled Document</title> </...
57
votes
5answers
95k 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 ...
57
votes
1answer
4k views

Does a client certificate identify the owner to unrelated websites?

If I install a client certificate in my browser, which websites can see any information about this client certificate or the CA that issued it? I once visited an ssl diagnostic site that immediately ...
56
votes
8answers
4k views

Is the Web browser status bar always trustable?

If I bring the mouse pointer to a link, but not click on it, I can see in the left/bottom corner that it displays the URL of it. Q: Could this URL (in the left/bottom) be different from the one that ...
55
votes
8answers
45k views

Why do browsers default to http: and not https: for typed in URLs? [duplicate]

When I type example.com without any scheme into the browser bar and press Enter it is interpreted as HTTP://example.com, not HTTPS://example.com. Why? And where are the plans to fix this? (To be ...
54
votes
5answers
15k views

IMG tag vulnerability

Is it safe to display images from arbitrary domains? I.e. let's say I have an image on my page: <img src="http://badguy.com/image.gif" /> What if image.gif will return some js attack vector, ...
51
votes
2answers
12k views

Is this Paypal Github SDK reference really a dangerous site?

I'm working on integrating a payment system with paypal in C#, and I installed the official paypal nuget package. Then I went to the paypal github site. And linked to this below site (SDK Reference). ...
50
votes
6answers
9k views

Is there any difference between HTTP and HTTPS when using my home / own internet connection

First of all I am a web developer and not a security expert. I have read lots of articles about the difference between HTTPS and HTTP, including this site. The basic idea I got from them is, when ...
47
votes
12answers
7k 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, ...
46
votes
3answers
10k views

Are virtual keyboards not necessary anymore to protect against keyloggers?

My bank has issued a new version of their online banking site. This new version has no virtual keyboard to enter the PIN. I asked them how are they protecting me against keyloggers but I didn't ...
44
votes
3answers
9k views

Why don't browsers block cross-site POSTs by default?

Same-origin policy (SOP) makes browsers block scripting from one origin to mess with another, unless explicitly being told not to do so. But cross-site POSTs are still allowed, creating the vector for ...
44
votes
5answers
6k views

What's the danger of having some random, out of my control, JavaScript code running on my pages?

My website pages reference some JavaScript code from a third-party CDN (analytics, etc). So I don't control what code is there - the third party may change those scripts at any moment and introduce ...
43
votes
4answers
39k 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 POST request? I realize that the query string will be encrypted, but are there other reasons to avoid passing data in the ...
43
votes
11answers
19k views

Is anybody using client browser certificates?

Client browser certificates seem to be a nice way to protect sites from intruders - it is impossible to guess and should be harder to steal. Of course, they do not solve all the problems, but they add ...
43
votes
2answers
20k views

What malicious things can happen when clicking on links in email?

I've received a spam from one of my friends (well I'm sure he didn't send it). so there's this link, and i'd thought what exactly would be the implications of clicking the link (i've not clicked it ...
43
votes
3answers
96k views

Can you get virus just by visiting a website in Chrome?

I've recently read Google Chrome: The End of Drive-By Downloads. Is it true to say that drive-by-downloads are history in Google Chrome? So if I have a link (from a spam email) I can right-click >> ...
42
votes
3answers
8k views

Why do some internet banks force logout on back button?

A design pattern I've noticed on internet banking sites is that you get automatically logged out and sent to a warning page if/when you hit the back button on your browser, ending your session and ...
40
votes
4answers
6k views

Have computer criminals been known to exploit easily-edited websites like Wikipedia to embed malicious scripts?

When I was reading a page on Wikipedia several months ago (December 2014) I saw what looked like a pop-up window from BT, but I soon realized that when I closed the page the pop-up disappeared. I then ...
39
votes
5answers
32k views

Why do you need to close your browser window after logging out of a website?

I might be wrong, but I believe the request to close the browser window after logging out is common, though it's completely unclear what the risks might be of failing to close a browser window (...
38
votes
9answers
5k views

Why is it a security problem not to update one's browser?

Is it in general a security problem not to update your browser. Firefox constantly prompts me to update my browser, but how dangerous is it to not update? As part of this question, I would like to ...
38
votes
4answers
6k views

How can you change “system fonts” in Firefox (to increase own safety & privacy)?

I know there were some previous (similar) questions to this, I have read them all and also tried but nothing has really helped (maybe because it was outdated information). What I did was I went to: ...
38
votes
5answers
8k views

Security of an initial redirection from http://example.com to https://example.com

Suppose that http://example.com/<foo> systematically redirects to https://example.com/<foo>. I enter http://example.com in my browser's URL bar, and I see a page load and the URL bar now ...
37
votes
8answers
12k views

Why should browser security be prioritized?

From this answer about browser security: time to update if you really care about security So if every other software and functions I need can work on a 32-bit OS, I guess the only reason for ...
37
votes
3answers
45k 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 ...
37
votes
5answers
10k views

How secure are my passwords in the hands of Firefox using a Master Password?

I'm relying on Firefox to remember my passwords, using a Master Password of more than 25 characters. How secure is this set-up?
36
votes
3answers
42k 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 ...
32
votes
8answers
67k views

Where does SSL encryption take place?

I checked the data transmission of an HTTPS website (gmail.com) using Firebug. But I can't see any encryption to my submitted data (username and password). Where does SSL encryption take place?