Facebook is an online social networking service founded in February 2004 by Mark Zuckerberg.

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131
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5answers
16k views

Does Facebook store plain-text passwords?

I was about to reset my Facebook password and got this error: Your new password is too similar to your current password. Please try another password. I assumed that Facebook stores only password ...
44
votes
5answers
72k views

Anonymity on Facebook - how do they suggest people I should know?

I want to know how Facebook discovers the people who you know in real life or who know you. I tried the following to see if Facebook can still discover my acquaintances in real life and suggest them ...
23
votes
1answer
2k views

Facebook password lowercase and uppercase

Recently I logged into my Facebook account and then noticed that my caps lock was on. So I tried to log in again with and without capslock on. I got in both times. Then I tried to log in with the ...
13
votes
2answers
8k views

Facebook API : App Secret - possible misuse

I've recently find out that by simple quick look into compiled code of one of our applications, you can get both App ID (API Key) and App Secret for Facebook API I suppose that we should really keep ...
12
votes
3answers
275 views

Is there any difference between visiting Facebook via their Tor address, and visiting them via their normal address over Tor?

From a security perspective, is visiting via the .onion address more/less secure? I'm using Facebook as an example, but this question is really about any website which has both a 'normal' and a Tor ...
12
votes
3answers
2k views

Should we store accesstoken in our database for oauth2?

I have a requirement to implement Facebook and Google login in my web application. I also need to access a user's Facebook/Google+ friend list. I have gone through the complete OAuth2 documentation of ...
11
votes
2answers
274 views

Preventing Voter Fraud on a Social Media Contest

I'm creating a contest that will allow users to login using their Facebook & Twitter accounts and submit votes on videos. My clients concern is that users will game the system by logging into ...
10
votes
3answers
5k views

Best practices on securely storing access tokens

What would be the best practices for storing access tokens of another api for your users? In particular I'm developing an application with some friends that let's user log into Facebook to both ...
8
votes
1answer
3k views

Storing OAuth and other authentication tokens

We all know that when to store passwords, we should store it with one-way hash such as a variant of SHA, bcrypt or scrypt to prevent plain-text password leaks when the database is hacked. But what ...
7
votes
2answers
341 views

How does an attacker abuse Facebook Connect with a leaked secret key?

I am reading about Facebook Connect and it looks a lot like OpenID Connect. Are these two similar enough that the Facebook Connect secret key is an OAuth Client Secret and therefore the same attacks ...
7
votes
1answer
432 views

Is there a list of phone numbers Facebook uses to send auth tokens?

Up to a few days ago, I always received Facebook auth tokens from numbers +181338477XX, except a few times from +85294985XXX. Problem is that lately I've been receiving codes directly from Italian ...
5
votes
6answers
18k views

Is update@em.facebookmail.com legitimate?

I'm having a hard time figuring out whether this email a friend of mine got is legit or a scam. The weird thing is there's only one link to facebook.com, which is the one about facebook terms. All the ...
5
votes
1answer
330 views

Safe to drop email verification when using Facebook login

If a user registers an account on my Website with Facebook authentication, can I safely skip the "verification email" that is usually sent to users who sign up without Facebook (that is, from a ...
5
votes
1answer
517 views

Is it safe to use the official Facebook apps in a public Wifi?

I know, that my login credentials are sent in clear text for every body to read, when I log into facebook without using https from my mobile phone's browser in an public / non encrypted wifi. And I ...
4
votes
3answers
291 views

February 7th 2013 Facebook integration error implications [duplicate]

What are the security, privacy, and overall availability implications of the Facebook event (link) yesterday? I was astonished to see site after site being redirected to a Facebook error page last ...
4
votes
2answers
2k views

Why doesn't Facebook use HSTS

To force a browser to always use HTTPS for a website (and not rely on 302 redirects to visit the HTTPS version), HTTP Strict Transport Security can be used. Please refer to ...
4
votes
2answers
259 views

Two-factor verification without a mobile phone?

Currently, some services use a second layer of veficiation if logging in from a new device: Gmail and Facebook send a text or call with a code Facebook generates a code in the mobile application ...
4
votes
1answer
182 views

Using Facebook via Tor

I think about using Tor for nearly everthing, including Facebook, because FB often tags the users even on other sites, for example per Like-Button, Cookies etc. Now I think about using the Tor ...
3
votes
4answers
554 views

How can I constrain or limit 3rd party Javascript (*.js) files that can DOS my site?

Many website owners integrate Google analytics, various Facebook or Twitter social media javascript plug ins into their web pages. The problem is that this trust seems to be "all or nothing", meaning ...
3
votes
1answer
261 views

Should I trust and play every embedded video on Facebook?

Regarding to trusted sites like YouTube, should I trust other videos when embedded to Facebook, usually, when user shares a link a thumbnail image will be created and previewed, then, we need only to ...
3
votes
3answers
748 views

Access Control and Authentication using Facebook access tokens in a webapp

I'm working on a mobile app with a web backend. We'd like to have users authenticate (log in) themselves through Facebook only, so we don't have to store passwords etc. and don't force users to create ...
3
votes
1answer
132 views

REST API stateless authentication using social login

I am implementing a REST API for our mobile applications in which user will login using the SDKs of various social media. Currently, the login strategy is as follows: The token(s) (access_token in ...
2
votes
3answers
1k views

Will this work? Revealing identity (facebook) of person who clicks specially crafted link

There is a special Facebook link that will redirect anyone who clicks it to their own Facebook profile they are currently logged in on on their browser. The link goes like this: ...
2
votes
3answers
187 views

How can Facebook possibly stop a bruteforce attack on an account?

I've been doing some research on hacking recently and I found some very interesting tutorials on brute force cracking. I have some questions to ask and I'll be using Facebook as an example. Let's say ...
2
votes
1answer
591 views

Why is a link posted to Facebook going through all redirects and showing info for final page only?

Today I read a post on a Facebook-group about a "problem" with links posted to Facebook. Appearently when you post a link at Facebook, the sites goes through the redirect(s) that may be on the site ...
2
votes
1answer
4k views

Is this Facebook email real or phishing?

I received this email from what is supposedly Facebook today. Here's a screenshot: I was not aware I had credits or credits existed on Facebook and apparently I have $2.30 worth. It looks legitimate ...
2
votes
1answer
109 views

While logged in to Google etc., can a malicious site discover my ID?

If I visited a malicious site while being logged in to Google, Hotmail, Facebook, or Twitter in the same browser window, how hard is it for the site to discover my account IDs without my explicit ...
2
votes
1answer
1k views

How could someone create a Facebook account with my email address without stealing it?

Someone with the same name as my sister seems to have inadvertently created a Facebook account with her email address. The funny thing is that this person doesn't seem to have ever accessed my ...
2
votes
1answer
796 views

Facebook oAuth2 for Javascript client application

When implementing Facebook login using oAuth2 (the Javascript version), I receive an access token back from the Facebook auth server. So far so good. The problem I have is that I want to implement a ...
2
votes
1answer
91 views

Can all of Facebook's data be wiped out? [closed]

Is there a possibility that Facebook's entire data could ever be wiped out by a team of malicious individuals or even a government? Remotely or physically. If so, how do you think they would go about ...
2
votes
0answers
348 views

Content-Security-Policy & Facebook login

This question seems to be related to http://stackoverflow.com/questions/15913200/facebook-js-sdk-not-executed-in-my-chrome-extension , but I am not developing a chrome extension. I am developing a ...
1
vote
3answers
27k views

Trace facebook user ip. Is it even possible?

As I know facebook chat is working like user <> server <> user and it's not P2P. I was talking with some guys today and they were pretty sure it's possible to netstat a facebook user IP ...
1
vote
1answer
11k views

Unsolicited Password Request from Facebook

Today I have received 3 emails to my three different addresses, one with Google, one with MSN, and one with my company. All emails were sent from password+kjdmiikvhppi at facebookmail.com email ...
1
vote
1answer
135 views

This facebook page looks different - phishing attempt?

After logging on to a public wifi, I was redirected to this page appearing to be from facebook, and being done via https: which looks markedly different from my normal facebook page I understand ...
1
vote
1answer
54 views

Which things can facebook access like contacts etc

I had two incidents . I added john to my skype account and i exchaged few messages. Then i went home and was checking facebook . Then at right side i saw Do you know john and it was his acoount ...
1
vote
1answer
89 views

Can Facebook login to my app?

This sounds maybe like a stupid question, but I'm wondering myself if this is theoretically possible. Let's say I'm using Facebook login in my app. If the login is successful I get I get back an ...
1
vote
2answers
152 views

How can Facebook use history data in browser

Web is filled up with the recent decision by Facebook to track user browsing history like adage.com andNYTimes. How can a web application use browsing history which is local to that browser? Is it ...
1
vote
1answer
384 views

How could the Skype app log me out from my Facebook account on OSX? Isn't this a huge security flaw?

According to this post (and to my personal experience), installing the Skype app on Facebook and the Skype client on OSX Mavericks will result in you being logged out from Facebook every time you ...
1
vote
1answer
121 views

Are photos on Facebook servers stored with the geotagging metadata in their EXIF headers?

If i download photo from Facebook, will i be able to read its geotagging metadata, or Facebook just parse the uploaded photo, record all EXIF headers into the database (to show the camera model ...
1
vote
1answer
144 views

How to suspend a silent oberserver from Facebook account?

A friend of mine told me about the following problem: She used to login on Facebook on a computer of her boyfriend. After they broke up she recognized that he was able to login to her account from his ...
1
vote
1answer
94 views

What makes it difficult for Facebook to implement restriction/ACL for accessing uploaded photo? [closed]

Facebook claims to allow restrict sharing to friends, certain network, or even custom when I upload photos. But it appears that this security is only in effect for the page where the photo is ...
1
vote
2answers
438 views

Extracting Facebook ID or E-Mail from Browser History

While i was looking at my browser history i noticed there has been a facebook login from my computer, there are some facebook related messaging and profile links in my browser history (chrome). The ...
1
vote
1answer
3k views

any information about en.quiente.info who has visited your account website

I ran across this site http://en.quiente.info, my friends tried it and they say it worked for them. It asks for most of the privileges on facebook even sending messages on behalf of you. Any one has ...
1
vote
2answers
58 views

Is it normal if user gets logged in Facebook or Twitter after they use Like or Tweet button? [closed]

Personally I don't use social networks, so I'm not sure about their behaviour. Currently I must code website which heavily depends on "Likes" and "Tweets" about articles. Each article has Like and ...
1
vote
0answers
83 views

Facebook Login and OpenID Connect [closed]

Can someone confirm whether Facebook Login API (https://developers.facebook.com/docs/facebook-login/v2.2) is based on OpenID Connect (http://openid.net/connect/) specification? Thanks, Sameer
1
vote
0answers
126 views

Password automatically typed into user box on facebook [closed]

Just want to ask some questions regarding on this strange experience while logging on my account on Facebook There are cases that I'm accidentally typing my password into the username box of the ...
1
vote
0answers
85 views

suspicious oauth2 implementation detail in facebook API

in RFC 6749 The OAuth 2.0 Authorization Framework 2.3.1. Client Password definitely states that authentication at TokenEndpoint can be done in two alternate ways HTTP basic authentication - ...
1
vote
1answer
615 views

Heartbleed and Facebook logins on (once) vulnerable sites [duplicate]

Users have been advised to consult a list of sites affected by heartbleed and to change their passwords on those sites once they are no longer vulnerable. Facebook appears to have been unaffected; but ...
1
vote
0answers
62 views

Purpose of Secure Key in Facebook(and other provider) in OAUTH?

I see lot of OAUTH provider give us a secure key. What is the purpose of secure key in Facebook(and other provider) in OAUTH?
1
vote
0answers
315 views

Implementing OAuth flow in JavaScript

I am making a custom auth flow for the application. It is inspired by OAuth 2.0. Dev sends user to an auth page on my domain, passing callback_url and api_id. I redirect user to callback_url, passing ...