Kurz gesagt
- CVE-2019-19135 ist eine Schwachstelle (HOCH (CVSS 7.4)) in org.eclipse.milo:sdk-client, netstandard.opc.ua (opcfoundation), ua-.netstandard (opcfoundation).
- Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 1.0%, höher als bei 64.1% aller Schwachstellen.
- Abhilfe: auf 0.3.6, 1.4.359.31 oder neuer aktualisieren.
Description
Impact
Credential replay affecting those connected to a server when all 3 of the following conditions are met:
SecurityPolicy is None- using username/password or X509-based authentication
- the server has a defect causing it to send null/empty or zeroed nonces
Patches
The problem has been patched in version 0.3.6. A more relaxed treatment of validation as agreed upon by the OPC UA Security Working Group is implemented in version 0.3.7.
Workarounds
Do not use username/password or X509-based authentication with SecurityPolicy of None.
References
https://opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2019-19135.pdf
For more information
If you have any questions or comments about this advisory:
NVD description
In OPC Foundation OPC UA .NET Standard codebase 1.4.357.28, servers do not create sufficiently random numbers in OPCFoundation.NetStandard.Opc.Ua before 1.4.359.31, which allows man in the middle attackers to reuse encrypted user credentials sent over the network.
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