Hello Team,

I have identified Stored Cross Site Scripting Vulnerability in JIRA -
Mail.ru Calendar Plugin.



*Overview-----------------------------------------------------------------------------------------------------------------------*Vendor:
JIRA
Vulnerable Product: Mail.ru Calendar Plugin
Vulnerable Version: Mail.ru Calendar Plugin 2.4.2.50_JIRA6
Vulnerability Type: Stored Cross Site Scripting Vulnerability
Vendor Homepage:
https://marketplace.atlassian.com/plugins/ru.mail.jira.plugins.mailrucal/versions
<http://www.servicenow.com/products/it-service-management.html>
CVE-ID: NA
Severity: High
Author: Omkar Joshi


Vulnerability Reported: 05/04/2016
Response From Vendor: 05/05/2016
Vendor Confirmation: 05/13/2016
Patch Released: NA



*Product
Description---------------------------------------------------------------------------------------------------------------------*
Jira (stylized JIRA) is a proprietary issue tracking product, developed by
Atlassian. It provides bug tracking, issue tracking, and project management
functions. Although normally styled JIRA, the product name is not an
acronym, but a truncation of Gojira, the Japanese name for Godzilla, itself
a reference to JIRA's main competitor, Bugzilla. It has been developed
since 2002. Mail.ru Calendar plugin displays issues from any project or
filter in calendar format. Custom field values are used as event data.





*Proof Of Concept
URL-----------------------------------------------------------------------------------------------------------------------Stored
Cross Site Scripting ->*
https://mtjira.XXX.com/jira/secure/MailRuCalendar.jspa#period/month
<https://mtjira.searshc.com/jira/secure/MailRuCalendar.jspa#period/month>

*Credits & Authors*
------------------------------------------------------------------------------------------------------------------

Omkar Joshi

*Steps to Reproduce:*


*Attack Scenario: Stored Cross Site Scripting*

Step 1. Login into JIRA v6.4
Step 2: Go to Calender.
Step 3: Click on Add Calender tab -> Create New
Step 4: Insert XSS payload in "Name" parameter of Create Calender. I have
used "><img src=x onerror=prompt(document.cookie);> XSS payload
Step 5: Then click on Create
Step 6: Whenever anyone try to edit the alert 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

Kindly find attached screenshot (POC) for the same.

*Thanks & Regards,*


*Omkar Joshi(+91)8087226463 <%28%2B91%298087226463>*