#VU10887 Security restrictions bypass in Siemens products - CVE-2018-4840

Vulnerability identifier: #VU10887

Vulnerability risk: Low

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

CVE-ID: CVE-2018-4840

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
DIGSI 4
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 upload a modified device configuration, and overwrite access authorization passwords.

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

DIGSI 4: All versions

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External links
https://cert-portal.siemens.com/productcert/pdf/ssa-203306.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.