Denial of service in WAGO 750 Series

1) Improper resource shutdown or release

EUVDB-ID: #VU11401

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8836

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to an improper implementation of the 3 way handshake during a TCP connection affecting the communications with commission and service tools. A remote attacker can send specially crafted packets to Port 2455/TCP/IP and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

WAGO PLC Series 750-880: 10

WAGO PLC Series 750-881: 10

WAGO PLC Series 750-852: 10

WAGO PLC Series 750-882: 10

WAGO PLC Series 750-885: 10

WAGO PLC Series 750-831: 10

WAGO PLC Series 750-889: 10

WAGO PLC Series 750-829: 10

External links

http://www.wago.com/medias/Vulnerability-in-the-WAGO-Ethernet-TCP-IP-driver.pdf?context=bWFzdGVyfHJ...

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.