16 May 2019

KLCERT-19-026: Siemens WinCC local denial of service

Timeline

Timeline

  • Kaspersky ICS CERT advisory published

    May 2019

  • Vendor advisory published

    May 2019

  • Vulnerability patched

    May 2019

  • Vendor confirmation

    December 2018

  • Vulnerability reported

    December 2018

Description

An attacker with local access to the project file could cause a Denial-of-Service condition on the affected product while the project file is loaded.

Successful exploitation requires access to the project file. An attacker could use the vulnerability to compromise availability of the affected system.


Exploitability

Local

Attack complexity

Low

User interaction

None

Impact

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code.

Existence of exploit

Unknown

Affected products

SIMATIC PCS 7 V8.0 and earlier: All versions
SIMATIC PCS 7 V8.1: All versions
SIMATIC PCS 7 V8.2: All versions
SIMATIC PCS 7 V9.0: All versions
SIMATIC WinCC (TIA Portal) V13: All versions
SIMATIC WinCC (TIA Portal) V14: All versions
SIMATIC WinCC (TIA Portal) V15: All versions
SIMATIC WinCC Runtime Professional: All versions
SIMATIC WinCC V7.2 and earlier: All versions
SIMATIC WinCC V7.3: All versions
SIMATIC WinCC V7.4: All versions
SIMATIC WinCC V7.5: All versions < V7.5 Upd3

Mitigation

Vendor mitigation

Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce the risk:

  • Apply Defense-in-Depth
  • Enable “Encrypted communication” in SIMATIC WinCC and SIMATIC PCS 7.
  • Only open project files from trusted locations.

Kaspersky Lab publishes information on newly identified vulnerabilities in order to raise user awareness of the IT security threats detected. Kaspersky Lab does not make any guarantees in respect of information received from vendors of products in which vulnerabilities have been identified, which is included in the following sections of the advisory: Affected Products, Vendor Mitigation.

Timeline

  • Kaspersky ICS CERT advisory published

    May 2019

  • Vendor advisory published

    May 2019

  • Vulnerability patched

    May 2019

  • Vendor confirmation

    December 2018

  • Vulnerability reported

    December 2018