Medium severity

Facebook social network vulnerable to Open Redirect

Open Redirect on the Facebook social network, exploitable among users who are friends.

Original release date
July 2011
Discovered by
Vicente Aguilera Díaz
Severity
6.8 / 10 CVSS v2.0
Affected product
Facebook: www.facebook.com, m.facebook.com and touch.facebook.com

Antecedentes

Facebook is a social networking service (www.facebook.com) launched in February 2004 and operated by Facebook, Inc. In July 2011, it had more than 750 million active users.

Description

An open redirect is a vulnerability in which a parameter redirects the user to its value without any validation. It is used in phishing attacks to trick users into visiting malicious websites without realizing it. The vulnerability is only exploitable between users who are friends.

Business impact

The vulnerability allows phishing attacks.

Affected systems

The Facebook social network: www.facebook.com (main site), m.facebook.com and touch.facebook.com (mobile versions).

Solución

The manufacturer has not provided any solution.

Calendario de divulgación

17 Jul 2011 Vulnerability discovered.
Jul 18, 2011 Facebook is notified of the vulnerability.
Jul 18, 2011 Facebook responds that the vulnerability is not exploitable.
19 Jul 2011 Internet Security Auditors contacts Facebook and provides more details on how to exploit it.
21 Jul 2011 Facebook responds that the intended functionality of the l.php endpoint is necessary and that the security benefits it provides outweigh the perceived risks.

References

Sobre Internet Security Auditors

Company based in Spain and Colombia, specializing in web application auditing, network security, penetration testing, and compliance implementation and assessment. Our clients include some of the largest finance, telecommunications, insurance, and ICT companies. A vendor-independent provider with in-depth experience since 2001. Our R&D efforts include vulnerability research, collaboration on open security projects, whitepapers, and participation in industry events.

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