CVE-2023-27321: (Pwn2Own) OPC Foundation UA .NET Standard ConditionRefresh Resource Exhaustion Denial-of-Service Vulnerability
First published: Fri May 05 2023(Updated: )
OPC Foundation UA .NET Standard ConditionRefresh Resource Exhaustion Denial-of-Service Vulnerability. This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of OPC Foundation UA .NET Standard. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of OPC UA ConditionRefresh requests. By sending a large number of requests, an attacker can consume all available resources on the server. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-20505.
Credit: zdi-disclosures@trendmicro.com zdi-disclosures@trendmicro.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| nuget/OPCFoundation.NetStandard.Opc.Ua.Server | <1.4.371.86 | 1.4.371.86 |
| OPC Foundation UA .NET Standard |
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Reference Links
- https://github.com/OPCFoundation/UA-.NETStandard/security/advisories/GHSA-vpf7-r2fv-75m9
- https://github.com/advisories/GHSA-vpf7-r2fv-75m9 (Advisory)
- https://www.zerodayinitiative.com/advisories/ZDI-23-548/
- https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2023-27321.pdf
- https://nvd.nist.gov/vuln/detail/CVE-2023-27321
- https://www.zerodayinitiative.com/advisories/ZDI-23-548
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