[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[FD] Yahoo Bug Bounty #37 - Sender Spoofing Vulnerability

Document Title:
===============
Yahoo Bug Bounty #37 - Sender Spoofing Vulnerability 


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1781


Release Date:
=============
2016-03-07


Vulnerability Laboratory ID (VL-ID):
====================================
1777


Common Vulnerability Scoring System:
====================================
3


Product & Service Introduction:
===============================
Yahoo Inc. (styled as Yahoo!) is an American multinational technology company 
headquartered in Sunnyvale, California. It is globally known 
for its Web portal, search engine Yahoo! Search, and related services, 
including Yahoo! Directory, Yahoo! Mail, Yahoo! News, Yahoo! Finance, 
Yahoo! Groups, Yahoo! Answers, advertising, online mapping, video sharing, 
fantasy sports and its social media website. It is one of the most 
popular sites in the United States.[9] According to third-party web analytics 
providers, Alexa and SimilarWeb, Yahoo! is the highest-read news 
and media website, with over 7 billion readers per month, being the fourth most 
visited website globally, as of June 2015.[8][10][11] According 
to news sources, roughly 700 million people visit Yahoo websites every month. 
Yahoo itself claims it attracts "more than half a billion consumers 
every month in more than 30 languages. Yahoo was founded by Jerry Yang and 
David Filo in January 1994 and was incorporated on March 1, 1995. Marissa 
Mayer, a former Google executive, serves as CEO and President of the company.

(Copy of the Homepage: https://en.wikipedia.org/wiki/Yahoo! )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a mail spoofing 
vulnerability in the official Yahoo classic online service web-application.


Vulnerability Disclosure Timeline:
==================================
2015-10-17: Researcher Notification & Coordination (Lawrence Amer)
2015-10-18: Vendor Notification (Yahoo Security Incident Team)
2015-10-25: Vendor Response/Feedback (Yahoo Security Incident Team)
2016-02-29: Vendor Fix/Patch (Yahoo Developer Team)
2016-02-29: Security Acknowledgements (Yahoo Security Incident Team)
2016-03-07: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================

Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Technical Details & Description:
================================
Remote attackers are able to spoof the sender name of yahoo email users to send 
a spoofed sender with spoofed content. 
After investigation in the vulnerability we discovered that it is located in 
the yahoo classic web application product. 
Attackers are able to perform the malicious interaction via the yahoo classic 
mail service. The vulnerability is located 
in the `compose message` module of the web service. The request method to 
inject or intercept as reply is POST.

Affected Module(s): 
                                [+] Message compose [yahoo classic version] 

Affected Parameter(s):
                                [+] from addresses [sender name] 



Proof of Concept (PoC):
=======================
The vulnerability can be exploited by remote attackers without privileged 
web-application user account or user interaction.
For security demonstration or to reproduce the web vulnerability follow the 
provided information and steps below to continue. 

Manual steps to reproduce the vulnerability ...
1. Login to attacker email address . change the mod of yahoo to classic one 
2. Attacker intercept the sending data and change the parameter [from address 
'send name '] to any desired name like " yahoo security " 
3. User receives a message as from yahoo security spoofing sender name 
4. Successful reproduce of the vulnerability!

PoC: Video
https://www.youtube.com/watch?v=tD7XmyF83NM


Solution - Fix & Patch:
=======================
The fix can be made by disallowing users to change or to edit the sender names 
in the main POST/GET method requests at all. 


Security Risk:
==============
The security risk of the spoofing web vulnerability in the yahoo classic 
service is estimated as medium. (CVSS 3.0)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Lawrence Amer - 
http://www.vulnerability-lab.com/show.php?user=Lawrence%20Amer



Disclaimer & Information:
=========================
The information provided in this advisory is provided as it is without any 
warranty. Vulnerability Lab disclaims all warranties, either expressed or 
implied, 
including the warranties of merchantability and capability for a particular 
purpose. Vulnerability-Lab or its suppliers are not liable in any case of 
damage, 
including direct, indirect, incidental, consequential loss of business profits 
or special damages, even if Vulnerability-Lab or its suppliers have been 
advised 
of the possibility of such damages. Some states do not allow the exclusion or 
limitation of liability for consequential or incidental damages so the 
foregoing 
limitation may not apply. We do not approve or encourage anybody to break any 
licenses, policies, deface websites, hack into databases or trade with stolen 
data.

Domains:    www.vulnerability-lab.com           - www.vuln-lab.com              
                                - www.evolution-sec.com
Contact:    admin@xxxxxxxxxxxxxxxxxxxxx         - 
research@xxxxxxxxxxxxxxxxxxxxx                                - 
admin@xxxxxxxxxxxxxxxxx
Section:    magazine.vulnerability-db.com       - 
vulnerability-lab.com/contact.php                             - 
evolution-sec.com/contact
Social:     twitter.com/vuln_lab                - facebook.com/VulnerabilityLab 
                                - youtube.com/user/vulnerability0lab
Feeds:      vulnerability-lab.com/rss/rss.php   - 
vulnerability-lab.com/rss/rss_upcoming.php                    - 
vulnerability-lab.com/rss/rss_news.php
Programs:   vulnerability-lab.com/submit.php    - 
vulnerability-lab.com/list-of-bug-bounty-programs.php         - 
vulnerability-lab.com/register.php

Any modified copy or reproduction, including partially usages, of this file 
requires authorization from Vulnerability Laboratory. Permission to 
electronically 
redistribute this alert in its unmodified form is granted. All other rights, 
including the use of other media, are reserved by Vulnerability-Lab Research 
Team or 
its suppliers. All pictures, texts, advisories, source code, videos and other 
information on this website is trademark of vulnerability-lab team & the 
specific 
authors or managers. To record, list, modify, use or edit our material contact 
(admin@ or research@xxxxxxxxxxxxxxxxxxxxx) to get a ask permission.

                                    Copyright © 2016 | Vulnerability Laboratory 
- [Evolution Security GmbH]™



-- 
VULNERABILITY LABORATORY - RESEARCH TEAM
SERVICE: www.vulnerability-lab.com
CONTACT: research@xxxxxxxxxxxxxxxxxxxxx



_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/