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Facebook Messenger / App MIME Sniffing Cross Site Scripting

Facebook Messenger / App MIME Sniffing Cross Site Scripting
Posted Sep 2, 2014
Authored by William Costa

Facebook Messenger and Facebook App suffers from a cross site scripting vulnerability due to a lack of file content validation.

tags | exploit, xss
SHA-256 | 984facfb08f08d6659766f7d97fe50566a9cb53325e50fee998518109f250154

Facebook Messenger / App MIME Sniffing Cross Site Scripting

Change Mirror Download
I. VULNERABILITY
-------------------------
Reflected XSS Attacks vulnerabilities used MIME Sniffing in Facebook
Messenger and Facebook App for iOS.

II. BACKGROUND
-------------------------
Facebook is a social networks

III. DESCRIPTION
-------------------------
Has been detected a Reflected XSS vulnerability by MIME Sniffing.
The code injection is done through chat use send file.
IV. PROOF OF CONCEPT
-------------------------
The application does not validate the contente of file send, only
valitation of extention.
Content of file face.jjjj:
<script src="https://www.dropbox.com/s/hp796og5p9va7zt/face.js?dl=1">
</script>
Content of file face.js:
alert("Alert XSS Chat send File Facebook Messenger");






V. BUSINESS IMPACT
-------------------------
An attacker can execute arbitrary HTML or script code in a targeted
user's browser, , that allows the execution of arbitrary HTML/script code
to be executed in the context of the victim user's browser.
An attacker can make fake facebook site requesting the User and password to
view the contents of the file, thus having access to data of the victim.

VI. SYSTEMS AFFECTED
-------------------------
Tested IPAD iOS version 7.1.2, Facebook APP Vesion 14.0, Messenger Facebook
Version 10.0.

By William Costa
william.costa no spam gmail.com


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