Authentication bypass in WAGO PFC200 Series controllers

1) Authentication bypass

EUVDB-ID: #VU10574

Risk: High

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-5459

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker can bypass authentication on the target system.

The weakness exists due improper authentication. A remote attacker can send specially-crafted TCP packets to Port 2455, bypass authentication, execute some unauthenticated commands such as reading, writing, or deleting arbitrary files, or manipulate the PLC application during runtime and execute arbitrary code.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Install update from vendor's website.

Vulnerable software versions

WAGO PFC200 Series 750-8208/025-000: All versions

WAGO PFC200 Series 750-8208: All versions

WAGO PFC200 Series 750-8207/025-001: All versions

WAGO PFC200 Series 750-8207/025-000: All versions

WAGO PFC200 Series 750-8207: All versions

WAGO PFC200 Series 750-8206/025-001: All versions

WAGO PFC200 Series 750-8206/025-000: All versions

WAGO PFC200 Series 750-8206: All versions

WAGO PFC200 Series 750-8204/025-000: All versions

WAGO PFC200 Series 750-8204: All versions

WAGO PFC200 Series 750-8203/025-000: All versions

WAGO PFC200 Series 750-8203: All versions

WAGO PFC200 Series 750-8202/040-001: All versions

WAGO PFC200 Series 750-8202/025-002: All versions

WAGO PFC200 Series 750-8202/025-001: All versions

WAGO PFC200 Series 750-8202/025-000: All versions

WAGO PFC200 Series 750-8202: All versions

External links

http://global.wago.com/media/2_products/security/Sec-Advisory_CoDeSys.pdf

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.