OpenEMR 5.0.0 Command Injection / Cross Site Scripting

2017.12.04
Credit: Jasveer
Risk: High
Local: No
Remote: Yes
CWE: CWE-79
CWE-78


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: None
Availability impact: None

SEC Consult Vulnerability Lab Security Advisory < 20171130-1 > ======================================================================= title: OS Command Injection & Reflected Cross Site Scripting product: OpenEMR vulnerable version: 5.0.0 fixed version: 5.0.0 Patch 2 or higher CVE number: - impact: Critical homepage: http://www.open-emr.org/ found: 2017-03-03 by: Wan Ikram (Office Kuala Lumpur) Fikri Fadzil (Office Kuala Lumpur) Jasveer Singh (Office Kuala Lumpur) SEC Consult Vulnerability Lab An integrated part of SEC Consult Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "OpenEMR is the most popular open source electronic health records and medical practice management solution. ONC certified with international usage, OpenEMR's goal is a superior alternative to its proprietary counterparts." Source: http://www.open-emr.org/ Business recommendation: ------------------------ By exploiting the vulnerability documented in this advisory, an attacker can fully compromise the web server which has OpenEMR installed. Potentially sensitive health care and medical data might get exposed through this attack. SEC Consult recommends not to attach OpenEMR to the network until a thorough security review has been performed by security professionals and all identified issues have been resolved. Vulnerability overview/description: ----------------------------------- 1. OS Command Injection Any OS commands can be injected by an authenticated attacker with any role. This is a serious vulnerability as the chance for the system to be fully compromised is very high. 2. Reflected Cross Site Scripting This vulnerability allows an attacker to inject malicious client side scripting which will be executed in the browser of users if they visit the manipulated site. There are different issues affecting various components. The flash component has not been fixed yet as OpenEMR is looking for a replacement component. Proof of concept: ----------------- 1. OS Command Injection Below is the detail of a HTTP request that needs to be sent to execute arbitrary OS commands through "fax_dispatch.php". URL : http://$DOMAIN/interface/fax/fax_dispatch.php?scan=x METHOD : POST PAYLOAD : form_save=1&form_cb_copy=1&form_cb_copy_type=1&form_images[]=x&form_ filename='||<os-commands-here>||'&form_pid=1 2. Reflected Cross Site Scripting The following URL parameters have been identified to be vulnerable against reflected cross site scripting: The following payload shows a simple alert message box: a) URL : http://$DOMAIN/library/openflashchart/open-flash-chart.swf METHOD : GET PAYLOAD : [PoC removed as no fix is available] b) URL : http://$DOMAIN/library/custom_template/ckeditor/_samples/assets/_posteddata.php METHOD : POST PAYLOAD : <script>alert('xss');</script>=SENDF Vulnerable / tested versions: ----------------------------- OpenEMR version 5.0.0 has been tested. This version was the latest at the time the security vulnerability was discovered. Vendor contact timeline: ------------------------ 2017-03-08: Contacting vendor through email. 2017-03-08: Vendor replied with his public key. Advisory sent through secure channel. 2017-03-17: Asked for a status update from the vendor. 2017-03-17: Vendor confirms the vulnerabilities and working on the fixes. 2017-03-31: Asked for a status update from the vendor. 2017-03-31: Vendor informed that they have fixed OS Command Injection and are currently working on fixes for Reflected Cross Site Scripting. 2017-04-25: Vendor requesting extension for deadline of 32 days from the latest possible release date. 2017-05-25: Asked for a status update from the vendor. 2017-05-29: Vendor informed that they are working on the fixes. 2017-06-06: Asked for a status update from the vendor. 2017-06-12: Vendor informed that they added solution into the development codebase. 2017-07-05: Asked for a status update from the vendor. 2017-07-10: Vendor informed patch is delayed due to another critical bug fixes. 2017-08-17: Asked for a status update from the vendor. No reply. 2017-08-24: Asked for a status update from the vendor. 2017-08-29: Vendor informed patch will be out soon. 2017-08-30: Asked vendor for specific release date for patch. No reply. 2017-09-08: Asked for a status update from the vendor. No reply. 2017-09-14: Asked for a status update from the vendor. 2017-09-18: Vendor informed that they are testing their patch. No estimation yet on the patch release date. 2017-10-17: Asked for a status update from the vendor. No reply. 2017-10-30: Asked for a status update from the vendor. 2017-10-31: Vendor informed that the patch will be released as soon as possible. 2017-11-15: Asked for a status update from the vendor. 2017-11-21: Vendor informed that they are working on other vulnerabilities 2017-11-30: Public release of SEC Consult advisory. Solution: --------- The vendor has fixed the code execution issue and XSS 2b) in GIT in March 2017: https://github.com/openemr/openemr/commit/ee0945a30dbb17ceee82b9b553d7dcb177710ca8#diff-1fdae02fadfcbc6147352cdc7c63279a The fix has been incorporated in 5.0.0 Patch 2 or higher. The XSS example 2a (flash) is not yet fixed. Because of critical security issues (CVE-2017-16540) of other security researchers it is highly recommended to upgrade to at least version 5.0.0 Patch 6 immediately. http://www.open-emr.org/wiki/index.php/OpenEMR_Patches Workaround: ----------- None Advisory URL: ------------- https://www.sec-consult.com/en/vulnerability-lab/advisories/index.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://sec-consult.com/en/career/index.html Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://sec-consult.com/en/contact/index.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF Jasveer Singh / @2017


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