ESB-2018.3070 - [Appliance] Siemens ROX II: Root compromise - Existing account 2018-10-10

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3070
                 Advisory (ICSA-18-282-03) Siemens ROX II
                              10 October 2018

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

Product:           Siemens ROX II
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Root Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-13802 CVE-2018-13801 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-282-03

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Advisory (ICSA-18-282-03)

Siemens ROX II

Original release date: October 09, 2018

Legal Notice

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1. EXECUTIVE SUMMARY

  o CVSS v3 8.8
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: Siemens
  o Equipment: ROX II
  o Vulnerabilities: Improper Privilege Management

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow valid users to
escalate their privileges and execute arbitrary commands.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports these vulnerabilities affect the following ROX II products:

  o ROX II: All versions prior to v2.12.1

3.2 VULNERABILITY OVERVIEW

3.2.1    IMPROPER PRIVILEGE MANAGEMENT CWE-269

An attacker with network access to Port 22/TCP and valid low-privileged user
credentials for the target device could perform a privilege escalation and
gain root privileges.

CVE-2018-13801 has been assigned to this vulnerability. A CVSS v3 base score
of 8.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U
/C:H/I:H/A:H).

3.2.2    IMPROPER PRIVILEGE MANAGEMENT CWE-269

An authenticated attacker with a high-privileged user account access via SSH
interface in on Port 22/TCP could circumvent restrictions and execute
arbitrary operating system commands.

CVE-2018-13802 has been assigned to this vulnerability. A CVSS v3 base score
of 7.2 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:H/UI:N/S:U
/C:H/I:H/A:H).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Energy, Healthcare and Public Health, and
    Transportation Systems
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens reported these vulnerabilities to NCCIC.

4. MITIGATIONS

Siemens recommends users update to the new version (v2.12.1) as soon as
possible. This version can be found at the following location on the Siemens
website:

https://support.industry.siemens.com/cs/us/en/view/109760683

To reduce risk, Siemens recommends that administrators restrict network access
to prevent potential attackers from accessing Port 22/TCP, if possible.

As a general security measure, Siemens strongly recommends protecting network
access to devices with appropriate mechanisms. In order to operate the devices
in a protected IT environment, Siemens recommends configuring the environment
according to Siemens' operational guidelines for industrial security (https://
www.siemens.com/cert/operational-guidelines-industrial-security), and
following the recommendations in the product manuals.

Additional information on industrial security by Siemens can be found at:

https://www.siemens.com/industrialsecurity

For more information on these vulnerabilities and detailed instructions,
please see Siemens Security Advisory SSA-493830 at the following location:

http://www.siemens.com/cert/advisories/

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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