Denial of service in Johnson Controls Metasys

1) XML External Entity injection

EUVDB-ID: #VU25987

Risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-9044

CWE-ID: CWE-611 - Improper Restriction of XML External Entity Reference ('XXE')

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information or perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied XML input. A remote attacker can pass a specially crafted XML code to the affected application and harvest ASCII files from the server.

Successful exploitation of the vulnerability may allow an attacker to view contents of arbitrary file on the server or cause a denial of service condition on the target system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Metasys ADS: 10.1

Metasys ADX: 10.1

Metasys Open Data Server (ODS): 10.1

Metasys Open Application Server (OAS): 10.1

Metasys Network Automation Engine (NAE55): 9.0.1 - 9.0.6

Metasys Network Integration Engine (NIE55): 9.0.1 - 9.0.6

Metasys Network Integration Engine (NIE59): 9.0.1 - 9.0.6

Metasys Network Automation Engine (NAE85): 10.1

Network Integration Engine (NIE85): 10.1

Metasys LonWorks Control Server (LCS): 10.1

Metasys System Configuration Tool (SCT): 13.2

Metasys Smoke Control Network Automation Engine (NAE55): 8.1

Smoke Control Network Automation Engine (UL 864 UUKL/ORD-C100-13 UUKLC 10th Edition Listed): 8.1

External links

http://www.us-cert.gov/ics/advisories/icsa-20-070-05
http://www.johnsoncontrols.com/-/media/jci/cyber-solutions/product-security-advisories/2020/jci-psa-2020_3-v1-microsoft_net-framework.pdf?la=en&hash=FFFFDCAB051B8EB3DA1C605C966F077F28AE1BD3

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.