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Facebook Open URL Redirection Vulnerability 2013
From: Arul Kumar <arul.xtronix () gmail com>
Date: Mon, 17 Jun 2013 12:53:20 +0530

Description:
[#] Title           :  Facebook Open URL Redirection Vulnerability 2013
[#] Status        :  Unfixed
[#] Severity     :  High
[#] Works on  :  Any browser with any version
[#] Homepage  : www.facebook.com
[#] Author       :  Arul Kumar.V
[#] Email          :  arul.xtronix () gmail com

I have found Open URL Redirection Vulnerabilities in facebook's
dialogs such as"Option Dialog","Friends Dialog","OAuth Dialog".This
Vulnerability is exploitable to all users who are signed into
facebook.

Impact of Vulnerability:
1. The user may be redirected to an untrusted page that contains
malware which may then compromise the user's machine.

2. The user may be subjected to phishing attacks by being redirected
to an untrusted page.

3. This bug can be applicable to any user who are signed in which
works at any browsers with any version.

Vulnerable Dialogs:
Option Dialog  :    (/dialog/optin)
OAuth Dialog   :  (/dialog/oauth)
Friends Dialog : (/dialog/friends)

Source:
https://vimeo.com/68469298
http://www.securitytube.net/video/7787

If you need more details about this bug,Visit my blogspot.I have
explained in brief about this bug.
http://arulxtronix.blogspot.in/2013/06/facebook-open-url-redirection_3515.html

Proof Of Concept:

If any signed facebook user clicks any one of the following link,they
will be redirected into our desired pages.URL Shorteners can be used
to mask malicious links.

Note: You must be signed into a facebook account to redirect sites.

Vulnerable URL's:
Once again i am remembering you,you must be signed into an facebook
account to redirect sites

1)Using "next" Parameter:
https://www.facebook.com/dialog/optin?app_id==&next=http://google.com

https://www.facebook.com/dialog/oauth?app_id==&next=http://yahoo.com

https://m.facebook.com/dialog/friends?app_id==&next=http://bing.com

2)Using "redirect_uri" Parameter:
https://www.facebook.com/dialog/optin?app_id==&redirect_uri=http://google.com

https://www.facebook.com/dialog/oauth?app_id==&redirect_uri=http://yahoo.com

https://m.facebook.com/dialog/friends?app_id==&redirect_uri=http://bing.com

3) Phising demo:
www.facebook.com/dialog/optin?app_id==&next=http://fbnew.t15.org

Thank You,
Arul Kumar.V

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