Vulnerability identifier: #VU10888

Vulnerability risk: Low

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-4838

CWE-ID: CWE-306

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
EN100 Ethernet module IEC 104 variant
Hardware solutions / Security hardware applicances
EN100 Ethernet module DNP3 TCP variant
Hardware solutions / Security hardware applicances
EN100 Ethernet module Modbus TCP variant
Hardware solutions / Security hardware applicances
EN100 Ethernet module PROFINET IO variant
Hardware solutions / Security hardware applicances
EN100 Ethernet module IEC 61850 variant
Hardware solutions / Security hardware applicances

Vendor: Siemens

Description
The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to missing authentication for critical function. A remote attacker can upgrade or downgrade the firmware of the device, including downgrading to older versions with known vulnerabilities.

Mitigation
Install update from vendor's website.

Vulnerable software versions

EN100 Ethernet module IEC 104 variant: All versions

EN100 Ethernet module DNP3 TCP variant: All versions

EN100 Ethernet module Modbus TCP variant: All versions

EN100 Ethernet module PROFINET IO variant: All versions

EN100 Ethernet module IEC 61850 variant: All versions

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External links
http://cert-portal.siemens.com/productcert/pdf/ssa-845879.pdf

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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.