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LearnVest Cross Site Scripting

LearnVest Cross Site Scripting
Posted Jul 11, 2016
Authored by Omkar Joshi

LearnVest suffers from a persistent cross site scripting vulnerability. The author has emailed the vendor repeatedly with no response.

tags | exploit, xss
SHA-256 | 19aa9fd28ef3339f128e1a409e44d5a4d7c30ecbbc0a556276b6de77ff282545

LearnVest Cross Site Scripting

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# Exploit Title: LearnVest Web Application - Stored Cross-Site Scripting (XSS)
# Date: 07/04/16
# Exploit Author: Omkar Joshi
# Vendor Homepage: https://www.learnvest.com
# Version: Latest
# Contacted Vendor Date: 07/04/16


*# Affected URL:- https://www.learnvest.com/mylv/money/#/settings/account
<https://www.learnvest.com/mylv/money/#/settings/account> (My Profile)*

*# Attack Scenario: Stored Cross Site Scripting*
Step 1. Login into LearnVest Web Application

Step 2: Go to User Settings.

Step 3: Insert XSS payload in "Address", "Address Line 2" and "City"
parameter of Shipping Address.

I have used *"><img src=x onerror=prompt(document.cookie);>* XSS payload

Step 4: Then click on Save Settings

Step 5: Whenever anyone try to visit Settings Page or navigate pages of
LearnVest, XSS Script will get execute.

*# Impact of attack: *An attack can perform Cross Site Scripting attack and
steal the cookie of other active sessions. An attacker would exploit a
vulnerability within a website or web application that the victim would
visit, essentially using the vulnerable website as a vehicle to deliver a
malicious script to the victim’s browser. An attacker might be able to put
stored XSS into the website.
https://www.owasp.org/index.php/Cross-site_Scripting_(XSS)

*# Recommendation:*
Use an appropriate combination of white listing and blacklisting to ensure
only valid and expected input is processed by the system.Furthermore,
classes within the output tag libraries should also be modified to encode
potentially dangerous characters with their HTML escape Counter parts.
For more information refer the following link
https://www.owasp.org/index.php/XSS_(Cross_Site_Scripting)_Prevention_Cheat_Sheet

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