Vulnerability identifier: #VU14415

Vulnerability risk: Low

CVSSv3.1: 8.1 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-11453

CWE-ID: CWE-276

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
SIMATIC WinCC (TIA Portal)
Server applications / SCADA systems
SIMATIC STEP 7 (TIA Portal)
Server applications / SCADA systems

Vendor: Siemens

Description

The vulnerability allows a remote attacker to gain elevated privileges on the target system.

The vulnerability exists due to improper file permissions in the default installation of TIA Portal. A local unauthenticated attacker can attempt to start TIA Portal after the manipulation, insert specially crafted files and prevent TIA Portal startup (denial-of-service) or execute arbitrary code with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

SIMATIC WinCC (TIA Portal): 10.0 - 15.0

SIMATIC STEP 7 (TIA Portal): 10.0 - 15.0

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External links
http://cert-portal.siemens.com/productcert/pdf/ssa-979106.pdf

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.