ESB-2019.0445 - [Appliance] Siemens Licensing Software for SICAM 230: Multiple vulnerabilities 2019-02-13

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0445
    Advisory (ICSA-19-043-03) Siemens Licensing Software for SICAM 230
                             13 February 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Siemens Licensing Software for SICAM 230
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Increased Privileges            -- Console/Physical      
                   Denial of Service               -- Remote/Unauthenticated
                   Access Confidential Data        -- Console/Physical      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-3991 CVE-2018-3990 CVE-2018-3989

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-19-043-03

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Advisory (ICSA-19-043-03)

Siemens Licensing Software for SICAM 230

Original release date: February 12, 2019

Legal Notice

All information products included in http://ics-cert.us-cert.gov are
provided"as is" for informational purposes only. The Department of Homeland
Security (DHS) does not provide any warranties of any kind regarding any
information contained within. DHS does not endorse any commercial product or
service, referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the header.
For more information about TLP, see http://www.us-cert.gov/tlp/ .

1. EXECUTIVE SUMMARY

  o CVSS v3 10.0
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: Siemens
  o Equipment: WibuKey Digital Rights Management (DRM) used with SICAM 230
  o Vulnerabilities: Improper Input Validation

2. RISK EVALUATION

Successful exploitation of these vulnerabilities may allow information
disclosure, privilege escalation, or remote code execution.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Siemens SICAM 230, a process control system, are
affected by vulnerabilities in WibuKey Digital Rights Management (DRM):

  o SICAM 230: All Versions 7.20 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER INPUT VALIDATION CWE-20
A specially crafted IRP (I/O request packet) can cause the driver to return
uninitialized memory, which may result in kernel memory disclosure.

CVE-2018-3989 has been assigned to this vulnerability. A CVSS v3 base score of
4.3 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:C/
C:L/I:N/A:N ).

3.2.2 IMPROPER INPUT VALIDATION CWE-20
A specially crafted IRP (I/O request packet) can cause a buffer overflow,
resulting in kernel memory corruption, which may allow privilege escalation.

CVE-2018-3990 has been assigned to this vulnerability. A CVSS v3 base score of
9.3 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:C/
C:H/I:H/A:H ).

3.2.3 IMPROPER INPUT VALIDATION CWE-20
A specially crafted TCP packet sent to Port 22347/TCP can cause a heap
overflow, which may lead to remote code execution.

CVE-2018-3991 has been assigned to this vulnerability. A CVSS v3 base score of
10.0 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:C/
C:H/I:H/A:H ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS : Energy
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens reported these vulnerabilities to NCCIC.

4. MITIGATIONS

Siemens recommends users upgrade to WibuKey Digital Rights Management (DRM)
Version 6.50 or higher from WIBU SYSTEMS AG, which can be found at:

https://www.wibu.com/support/user/downloadsuser-software.html

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

  o CVE-2018-3991 can be mitigated by blocking Port 22347/TCP e.g., on an
    external firewall.

Siemens strongly recommends applying the provided security updates using the
corresponding tooling and documented procedures made available with the
product. If supported by the product, an automated means to apply the security
updates across multiple product instances may be used. Siemens strongly
recommends prior validation of any security update before being applied, and
supervision by trained staff of the update process in the target environment.

As a general security measure Siemens strongly recommends protecting network
access with appropriate mechanisms (e.g., firewalls, segmentation, VPN). Users
are advised to configure the environment according to Siemens operational
guidelines in order to run the devices in a protected IT environment.
Recommended security guidelines to secure substations can be found at: https://
www.siemens.com/gridsecurity.

For additional information see Siemens' security advisory SSA-760124 at the
following location:

http://www.siemens.com/cert/en/cert-security-advisories.htm

NCCIC recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:

  o Minimize network exposure for all control system devices and/or systems,
    and ensure that they are not accessible from the Internet .
  o Locate control system networks and remote devices behind firewalls, and
    isolate them from the business network.
  o When remote access is required, use secure methods, such as Virtual Private
    Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
    be updated to the most current version available. Also recognize that VPN
    is only as secure as the connected devices.

NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

NCCIC also provides a section for control systems security recommended
practices on the ICS-CERT web page. Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies .

Additional mitigation guidance and recommended practices are publicly available
on the ICS-CERT website in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .

Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC for tracking
and correlation against other incidents.

No known public exploits specifically target these vulnerabilities.

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