Denial of service in Prosys OPC UA products

1) Resource exhaustion

EUVDB-ID: #VU76736

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-32787

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources within the handling of OpenSecureChannel messages. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

UA Simulation Server: - - 5.4.2

UA SDK for Java: - - 4.10.2

UA Historian: - - 1.2.0

UA Modbus Server: - - 1.4.20

CPE2.3

• cpe:2.3:a:prosys_opc:ua_simulation_server:*:*:*:*:*:*:*:*
• cpe:2.3:a:prosys_opc:ua_simulation_server:5.4.2:*:*:*:*:*:*:*
• cpe:2.3:a:prosys_opc:ua_sdk_for_java:*:*:*:*:*:*:*:*
• cpe:2.3:a:prosys_opc:ua_sdk_for_java:4.10.2:*:*:*:*:*:*:*
• cpe:2.3:a:prosys_opc:ua_historian:*:*:*:*:*:*:*:*
• cpe:2.3:a:prosys_opc:ua_historian:1.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:prosys_opc:ua_modbus_server:*:*:*:*:*:*:*:*
• cpe:2.3:a:prosys_opc:ua_modbus_server:1.4.20:*:*:*:*:*:*:*

External links

https://github.com/OPCFoundation/UA-Java-Legacy/commit/6f176f2b445a27c157f1a32f225accc9ce8873c0
https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2023-32787.pdf
https://github.com/OPCFoundation/UA-Java-Legacy
https://www.zerodayinitiative.com/advisories/ZDI-23-778/
https://www.prosysopc.com/blog/pwn2own-2023-resource-exhaustion-exploit/

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.