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Livefyre LiveComments 3.0 Cross Site Scripting

Livefyre LiveComments 3.0 Cross Site Scripting
Posted Sep 17, 2014
Authored by Brij Kishore Mishra

Livefyre LiveComments version 3.0 suffers from a persistent cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | 6eccdbf0d02ef4c32c64da9928ac0666d213e0a528332a271898fa571fbd3865

Livefyre LiveComments 3.0 Cross Site Scripting

Change Mirror Download
Title : Stored XSS in Livefyre LiveComments Plugin
CVE : 2014-6420
Vendor Homepage : http://livefyre.com
Software Link : http://web.livefyre.com/streamhub/#liveComments
Version : v3.0
Author : Brij Kishore Mishra
Date : 03-Sept-2014
Tested On : Chrome 37, Ubuntu 14.04


Description :

This plugin requires user to be signed in via livefyre account to post
comments. Users have the option to upload pictures in comments. This
feature can be easily abused.

Using an intercepting proxy (e.g. Burp Suite), the name variable can be
edited to send an XSS payload while uploading a picture (payload used :
"><img src=x onerror=prompt(1337)>). When the comment is posted, the image
will be successfully uploaded, which leads to XSS due to an unsanitized
field.
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