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Carnegie Mellon University

Software Engineering Institute

CERT Coordination Center

drchrono Electronic Health Record (EHR) web applications vulnerable to cross-site scripting and cross-site request forgery

Vulnerability Note VU#973460

Original Release Date: 2014-10-29 | Last Revised: 2014-10-29

Overview

drchrono Electronic Health Record (EHR) web applications allow cross-site scripting (XSS) and cross-site request forgery (CSRF) that could allow an attacker to obtain sensitive patient information.

Description

drchrono provides an EHR web application service at drchrono.com, onpatient.com, and possibly other domains. The application contains XSS (CWE-80) and CSRF (CWE-352) vulnerabilities:

    • CSRF in new user feature allows a user to be created
    • CSRF protection bypass in new user feature allows CSRF, also allows an administrator to be created, requires attacker to be able to manipulate DNS or HTTP traffic
    • XSS in email feature sends email to patients
    • XSS in media upload feature allows attacker to read all data
    • XSS in email parsing allows authenticated user (including patients) to create a malicious email message to be read by a victim
    • XSS in patient document upload feature allows attacker to read all data

To exploit these vulnerabilities, an attacker would need to 1.) be (or act as) an authenticated user to upload or send malicious content or 2.) entice an authenticated user (most likely a clinician) to access the attacker's uploaded content or a web page hosted by the attacker.

Impact

By uploading or enticing a user to visit a specially crafted web page (either uploaded to the application or hosted by the attacker), an attacker can obtain nearly any EHR data, including sensitive patient health records and personally identifying information (PII).

Solution

These vulnerabilities have been fixed as of 6 Oct 2014.

Vendor Information


CVSS Metrics

Group Score Vector
Base 5.1 AV:N/AC:H/Au:N/C:P/I:P/A:P
Temporal 4.4 E:POC/RL:U/RC:UR
Environmental 3.6 CDP:ND/TD:M/CR:H/IR:ND/AR:ND

References

Acknowledgements

Thanks to Josh Mandel for researching and reporting these vulnerabilities, and drchrono for engaging and resolving them.

This document was written by Art Manion.

Other Information

CVE IDs: None
Date Public: 2014-10-29
Date First Published: 2014-10-29
Date Last Updated: 2014-10-29 18:42 UTC
Document Revision: 12

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