#VU17391 Missing authentication for critical function in PR100088 Modbus gateway - CVE-2019-6533

Vulnerability identifier: #VU17391

Vulnerability risk: Low

CVSSv4.0: 8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-6533

CWE-ID: CWE-306

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PR100088 Modbus gateway
Hardware solutions / Firmware

Vendor: Kunbus

Description

The vulnerability allows a remote attacker to bypass authentication.

The vulnerability exists due to missing authentication for critical function. A remote attacker can read and write registers used to store Modbus values from the web interface without authentication.

Mitigation
Update to version R02.

Vulnerable software versions

PR100088 Modbus gateway: before R02

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External links
https://ics-cert.us-cert.gov/advisories/ICSA-19-036-05

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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.