Gantt-Chart For Jira 5.5.4 Cross Site Scripting

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Advisory ID: SYSS-2020-030  
Product: Jira module "Gantt-Chart for Jira"  
Manufacturer: Frank Polscheit - Solutions & IT-Consulting  
Affected Version(s): <=5.5.4  
Tested Version(s): 5.5.3, 5.5.4  
Vulnerability Type: Cross-Site Scripting (CWE-79)  
Risk Level: Medium  
Solution Status: Fixed  
Manufacturer Notification: 2020-07-23  
Solution Date: 2020-07-31  
Public Disclosure: 2020-08-03  
CVE Reference: CVE-2020-15944  
Author of Advisory: Sebastian Auwaerter, SySS GmbH  
  
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Overview:  
  
Gantt-Chart for Jira is a Jira module for displaying Gantt charts.  
  
The manufacturer describes the product as follows (see [1]):  
  
"High performance Gantt-Chart capable to display multi-projects with  
10.000+ issues aggregating them as top-level big picture"  
  
Due to missing validation of user input, the module is vulnerable to  
a persistent cross-site scripting attack. As described in  
security advisory SYSS-2020-029 (see [4]), it is also possible to  
attack other users with this attack vector.  
  
To exploit this vulnerability, an attacker has to be authenticated.  
  
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Vulnerability Details:  
  
The vulnerability exists because the names of newly created filters  
are not properly sanitized by the extension. A simple attack vector  
like "<script>alert('XSS')</script>" can be chosen as the name of  
a filter and is then displayed on every load of the vulnerable module.  
  
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Proof of Concept (PoC):  
  
This security vulnerability can be reproduced by simply creating a new  
filter with the "filter name" "<script>alert('XSS')</script>". Whenever  
the dashboard with the vulnerable module is loaded, the attack vector  
gets executed.  
  
The following request is sent to the web server:  
  
PUT /rest/gantt/1.0/user/properties/<chart_id>?userKey=<your_user_name>  
HTTP/1.1  
Host: <victim_host>  
[...]  
  
[...]"filters":{{"search":""},"<script>alert(\"XSS\")</script>"}[...]  
  
!!! This filter can not be easily removed via the web interface. !!!  
!!! Use with caution. !!!  
  
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Solution:  
  
Update to software version 5.5.5  
  
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Disclosure Timeline:  
  
2020-07-21: Vulnerability discovered  
2020-07-23: Vulnerability reported to manufacturer  
2020-07-31: Patch released by manufacturer  
2020-08-03: Public disclosure of vulnerability  
  
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References:  
  
[1] Product Website for Jira Module "Gantt-Chart"  
  
https://marketplace.atlassian.com/apps/28997/gantt-chart-for-jira?hosting=cloud&tab=overview  
[2] SySS Security Advisory SYSS-2020-030  
  
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-030.txt  
[3] SySS Responsible Disclosure Policy  
https://www.syss.de/en/news/responsible-disclosure-policy/  
[4] SySS Security Advisory SYSS-2020-029  
  
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-029.txt  
  
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Credits:  
  
This security vulnerability was found by Sebastian Auwaerter of SySS  
GmbH.  
  
E-Mail: [email protected]  
Public Key:  
https://www.syss.de/fileadmin/dokumente/PGPKeys/Sebastian_Auwaerter.asc  
Key Fingerprint: F98C 3E12 6713 19D9 9E2F BE3E E9A3 0D48 E2F0 A8B6  
  
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Disclaimer:  
  
The information provided in this security advisory is provided "as is"  
and without warranty of any kind. Details of this security advisory may  
be updated in order to provide as accurate information as possible. The  
latest version of this security advisory is available on the SySS website.  
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