[FD] Hyland OnBase 19.x and below - XML External Entity (XXE) Injection

[AdaptiveSecurity Consulting via Fulldisclosure <fulldisclosure@xxxxxxxxxxxx>]

CVSSv3.1 Score
-------------------------------------------------
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Vendor
-------------------------------------------------
Hyland Software - (https://www.hyland.com/en/ and https://www.onbase.com/en/)

Product
-------------------------------------------------
Hyland OnBase
All derivatives based on OnBase

Versions Affected
-------------------------------------------------
All versions up to and prior to OnBase Foundation EP1 (tested: 19.8.9.1000) and 
OnBase 18 (tested: 18.0.0.32). OnBase Foundation EP2 and OnBase Foundation EP3 
were not available to test, but Hyland's response indicates that they are not 
likely to have fixed the vulnerabilities.

Credit
-------------------------------------------------
Adaptive Security Consulting

Vulnerability Summary
-------------------------------------------------
Because Hyland OnBase largely relies on client-side validation, the server-side 
contains a number of critical XXE injection flaws, allowing remote attackers 
read and write arbitrary files, as well as run arbitrary commands on the OnBase 
server. All versions of OnBase were found to be equally vulnerable.

Technical Details
-------------------------------------------------
OnBase server allows XXE injection in multiple methods that accept and parse 
user-provided XML.

Solution
-------------------------------------------------
Multiple methods within OnBase server accept XML-based input, like for managing 
and creating users and patients, creating and editing charts and documents, and 
editing and creating records. Several of these methods were found to allow XXE 
injection because they fail to ignore the DTD specification, allowing attackers 
to read and write arbitrary files on the server and run arbitrary commands. 
Additional methods were found in other parts of the application, especially 
those tied to server configuration. All instances found required the user to be 
authenticated, but any authenticated user could call the methods.

Timeline
-------------------------------------------------
07 May 2019 - Adaptive Security Consulting discovered a series of 
vulnerabilities in medical records management and search applications being 
considered by our client
15 May 2019 - The client was provided with the results of the assessment, 
including POCs for a number of high and critical vulnerabilities
12 July 2019 - Client asked for more information and demonstrations
01 October 2019 - Client asked to test latest version of Hyland software
15 October 2019 - Client was informed that EP1 contained many of the same 
vulnerabilities
March 2020 - Client contacted Hyland and spoke with the Director of Application 
Security who said that fixing vulnerabilities was "writing custom code" and 
that Hyland "doesn't write custom code"
21 April 2020 - Adaptive Security Consulting attempted to contact Hyland's 
Application Security Team via email on behalf of client, but attempts were 
ignored

_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/