Share
# Exploit Title: REDCap < 9.1.2 - Cross-Site Scripting  
# Date: 2019-07-19  
# Exploit Author: Dylan GARNAUD & Alexandre ZANNI (https://pwn.by/noraj) - Pentesters from Orange Cyberdefense France  
# Vendor Homepage: https://projectredcap.org  
# Software Link: https://projectredcap.org  
# Version: Redcap 9.x.x before 9.1.2 and 8.x.x before 8.10.2  
# Tested on: 9.1.0  
# CVE: CVE-2019-13029  
# Security advisory: https://gitlab.com/snippets/1874216  
  
### Stored XSS n°1 – Project name (found by Dylan GARNAUD)  
  
Most JavaScript event are blacklisted but not all. As a result we found one event that was not blacklisted and successfully used it.  
  
- Where? In project name  
- Payload: `<BODY onKeyPress=alert("xss")>`  
- Details: Since it is an *onkeypress* event, it is triggered whenever the user touch any key and since the XSS payload is stored in the project name it appears in several pages.  
- Privileges: It requires admin privileges to store it.  
- Location example: https://redcap.XXX/redcap/redcap_v9.1.0/ProjectSetup/index.php?pid=16&msg=projectmodified  
  
### Stored XSS n°2 – Calendar (found by Dylan GARNAUD)  
  
- Where? Calendar event  
- Payload: `<BODY onKeyPress=alert("xss")>`  
- Privileges: It requires admin privileges to store it.  
- Location example: https://redcap.XXX/redcap/redcap_v9.1.0/Calendar/index.php?pid=16&view=week&month=7&year=2019&day=12  
  
### Stored XSS n°3 – CSV upload (found by Dylan GARNAUD)  
  
- Where? Wherever there is a CSV upload feature with displayed parsed results  
- Payload:  
```csv  
record_id,my_first_instrument_complete,body_onkeypressalertxssinstrumetn_complete  
<script>alert("upload xss")</script>,,  
```  
- Details: Once the malicious CSV is uploaded, the parsed content is inserted into a HTML table where the XSS will be triggered.  
- Privileges: It requires admin privileges to store it.  
- URL examples of execution:  
+ https://redcap.XXX/redcap/redcap_v9.1.0/index.php?pid=16&route=DataComparisonController:index  
+ https://redcap.XXX/redcap/redcap_v9.1.0/DataQuality/index.php?pid=16  
  
### Stored XSS n°4 – Survey queue (found by Alexandre ZANNI)  
  
- Where? In the Survey Queue (choose a Projet > Project Home and Design > Design > Survey Queue)  
- Payload: `</textarea><svg/onload='alert("XSS survey queue")'>`  
- Privileges: It requires admin privileges to store it.  
- Location example: https://redcap.XXX/redcap/redcap_v9.1.0/Design/online_designer.php?pid=16  
  
### Stored XSS n°5 – Survey (found by Alexandre ZANNI)  
  
- Where? In the survey management system.  
+ Store: One has to select a project, go in the *Designer* section, choose *Survey Settings* and then store the payload in the WYSIWYG editor section named *Survey Instructions* (the same happens for *Survey Completion Text*).  
+ Execute: Anyone who consults the survey, for example https://redcap.XXX/redcap/surveys/?s=88XF8CRJH4, will trigger the XSS.  
- Payload:  
```html  
<HTML><BODY><?xml:namespace prefix="t" ns="urn:schemas-microsoft-com:time"><?import namespace="t" implementation="#default#time2"><t:set attributeName="innerHTML" to="XSS<SCRIPT DEFER>javascript:alert('Survey XSS')</SCRIPT>"></BODY></HTML>  
```  
- Privileges:  
+ Store: It requires admin privileges to store it.  
+ Execute: Any unauthenticated user that can consult a survey.