Input validation error in Siemens products - CVE-2019-6575

Vulnerability identifier: #VU21971

CSH Severity: Medium

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green

CVE-ID: CVE-2019-6575

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vendor: Siemens

Affected software:
SIMATIC S7-1500 CPU
SIMATIC RF600R
SIMATIC NET PC Software
SIMATIC IPC DiagMonitor
SIMATIC HMI KTP Mobile Panels
SIMATIC HMI Comfort Panels 4”-22”
SIMATIC HMI Comfort Outdoor Panels 7” & 15”
SIMATIC ET 200SP Open Controller
SIMATIC CP443-1 OPC UA
SIMATIC RF188C

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in the OPC UA server. A remote attacker can send a specially crafted packet on port 4840/tcp and cause a denial of service condition on the OPC communication or crash the target device.

This vulnerability affects the following products:

Install updates from vendor's website.

• https://cert-portal.siemens.com/productcert/pdf/ssa-307392.pdf