Reusing a Nonce, Key Pair in Encryption in Metasys System - CVE-2019-7593
Published: August 21, 2019
Vulnerability identifier: #VU20344
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-7593
CWE-ID: CWE-323
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Johnson Controls
Affected software:
Metasys System
Metasys System
Detailed vulnerability description
The vulnerability allows a remote attacker to decrypt captured network traffic.
The vulnerability exists due to the ADS/ADX servers and NAE/NIE/NCE engines make use of a shared RSA key pair for certain encryption operations involving the Site Management Portal (SMP). A remote attacker with access to the shared RSA key pair can decrypt captured network traffic between the Metasys ADS/ADX servers or NAE/NIE/NCE engines and the connecting SMP user client.
How to mitigate CVE-2019-7593
Install updates from vendor's website.