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

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136
votes
5answers
18k 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 ...
48
votes
5answers
97k 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 ...
24
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 ...
21
votes
3answers
7k 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 ...
16
votes
2answers
9k 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
320 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 ...
11
votes
2answers
292 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
1answer
134 views

Firefox trying to connect to other computers on the LAN

While running Wireshark trying to troubleshoot some other issues, I noticed several SYN connections to ports 80 and 443 on the workstation I was using. The packets were dropped. These were coming from ...
10
votes
3answers
6k 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 ...
9
votes
3answers
262 views

Are bookmarklets safe with facebook data?

I usually play Mafia Wars and use bookmarklets like Spockholm, Arum, etc. Can these bookmarklets get my Facebook data when I run them, they usually ask to unframe the Facebook page? I was just ...
9
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 ...
8
votes
2answers
396 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 ...
8
votes
1answer
467 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 ...
6
votes
3answers
3k views

Why did Facebook not use HSTS for a long time after it became available?

(Note that Facebook now does use HSTS. The question was asked at a time when they didn't.) To force a browser to always go directly to HTTPS for a website (and not rely on 302 redirects from the HTTP ...
5
votes
2answers
1k views

Facebook POST request capture

I have been trying to test a sniff on facebook POST request forms using wireshark (filtered HTTP). At login form, I would try login, and then check wireshark and see that no packet was captured. ...
5
votes
6answers
21k 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
3answers
4k 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 ...
5
votes
1answer
394 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
668 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
298 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
1answer
7k 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 ...
4
votes
2answers
71 views

If the user registers for my site via e.g. Facebook login, should I force the user to also create a password on my site?

Most sites, when you register via e.g. Facebook, redirect you to a page afterwards asking you to enter additional information that the site needs. Very often this includes setting a password for the ...
4
votes
2answers
354 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
210 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
611 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
288 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
802 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
110 views

How is Facebook accessing my iPhone texts in order to recommend friends?

I have noticed that Facebook has been recently recommending people who have texted me. It has been able to connect their number (I believe most of these people are using iPhone) and connect their ...
3
votes
1answer
234 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 ...
3
votes
2answers
8k 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 ...
2
votes
3answers
2k 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
391 views

What's with the Facebook malware which posts obscene posts in all the groups? [closed]

How to get rid of the Facebook malware which sends pornographic posts in all the groups you belong to? I always made fun of people who became victim of this malware/virus saying they are not cautious ...
2
votes
1answer
656 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
78 views

Why do Facebook and Microsoft make you enter a code when reseting a password?

Typically when you reset a website password you receive an email. A lot of sites send you a link with a code on the end of it to click on which will take you to an 'enter new password' form. ...
2
votes
1answer
164 views

Facebook hacker [closed]

My Facebook account was hacked. Searching through security and settings info, Facebook showed that someone was logged into my account from another state and showed some kind of id number. The number ...
2
votes
1answer
97 views

How harmful is it to expose access token to the resource owner?

While checking the facebook php sdk implementation I noticed that they expose the access token to the resource owner (user) $params = array( 'next' => $next, 'access_token' => ...
2
votes
1answer
123 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
496 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 ...
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
631 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 ...
2
votes
1answer
922 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
103 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
433 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
34k 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
3answers
79 views

External JS Security

I'm kinda new to security development. I've work mostly with backend processing stuff. I've been assign on how to secure external javascript that we import from facebook, twitter and google. One ...
1
vote
1answer
13k 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
181 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
98 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
105 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
1answer
333 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 ...