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

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123
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5answers
13k 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 ...
41
votes
5answers
25k 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 ...
12
votes
2answers
6k 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 ...
10
votes
2answers
255 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 ...
9
votes
3answers
3k 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 ...
7
votes
2answers
300 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
422 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 ...
7
votes
1answer
2k 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 ...
5
votes
6answers
16k 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
272 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
2answers
147 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 ...
4
votes
3answers
284 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
174 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 ...
3
votes
4answers
514 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
233 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
682 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
138 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
1answer
402 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 ...
2
votes
3answers
665 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
1answer
522 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
708 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
2answers
959 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 ...
2
votes
1answer
93 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
873 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
622 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
0answers
269 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
16k 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
10k 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
75 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
121 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
269 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
97 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
86 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
355 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
0answers
81 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
54 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
597 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
50 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
249 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 ...
0
votes
2answers
128 views

Track my girlfriend's stolen computer

My girlfriend just told me that her computer was stolen, the computer was hibernated and the second the thief turn the computer on a lots a things will open automatically. I'm hoping I can get the ...
0
votes
1answer
351 views

Facebook Login for Intranet

How safe is Facebook Login? I'm currently building an intranet, for my small company. We're 10 employees, and no risk of them messing up from inside. But is using Facebook Login safe for this? How ...
0
votes
1answer
166 views

Did somebody connect to my facebook account?

I have a problem. I'm not sure, but I think that somebody (in our home network) found out a password to my Facebook account and sometimes logs in. Is there a way to find out whether it is true? There ...
0
votes
2answers
93 views

Malicious capabilities of Social Botnets

A fairly new concept in Malware, especially in the case of botnets, is the emergence of social botnets. These botnets are comprised of accounts (either a newly created account or an existing hijacked ...
0
votes
2answers
123 views

Can running a script while logged in compromise my facebook password?

In websites related to facebook malware analysis and information, we often see messages to the effect of if you have run this facebook app then your account has been compromised, or if you went to ...
0
votes
1answer
187 views

Facebook data visibility to admin staff

I recently had a conversation with a friend in which I told him that everything written on Facebook can be seen by the Facebook admin staff. As a software engineer and database administrator I know ...
0
votes
1answer
327 views

What is the risk of installing Facebook Video Calling jar file?

I'm trying to talk with somebody on Facebook, but after many Facebook privacy scandals, it's a big question. Secondly on OSX, it's giving me the error that “FacebookVideoCalling_v1.6.jar” can’t be ...
0
votes
1answer
123 views

Is this social engineering on facebook?

Today, I received a mail from fb saying that two of my friends have mentioned me in a comment. When I opened fb to see that comment, it was filled with random names (which obviously were their ...
0
votes
1answer
122 views

Protect from Facebook like clickjack

In the past month I've seen a better grade growth in sites that have clickjacking scripts that make you like the webpage or the Facebook site's Page when you click anywhere on the page. I have even ...
0
votes
1answer
204 views

Should I encrypt Long-lived Facebook Access Token when storing them in my DB?

I own an application that grabs some Long-Lived Facebook Access token, in order to be use later according to the corresponding logged user. Should I need to encrypt them before storing them, to avoid ...