ESB-2019.0444 - [Appliance] SIMATIC IPCs: Multiple vulnerabilities 2019-02-13

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0444
         Advisory (ICSA-19-043-05) Siemens Intel Active Management
                        Technology of SIMATIC IPCs
                             13 February 2019

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

Product:           SIMATIC IPCs
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
                   Increased Privileges   -- Console/Physical      
                   Denial of Service      -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-3658 CVE-2018-3657 CVE-2018-3616

Reference:         ESB-2018.2758

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-19-043-05

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Advisory (ICSA-19-043-05)

Siemens Intel Active Management Technology of SIMATIC IPCs

Original release date: February 12, 2019

Legal Notice

All information products included in http://ics-cert.us-cert.gov are
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For more information about TLP, see http://www.us-cert.gov/tlp/ .

1. EXECUTIVE SUMMARY

  o CVSS v3 6.7
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: Siemens
  o Equipment: Intel Active Management Technology (AMT) of SIMATIC IPCs
  o Vulnerabilities: Cryptographic Issues, Improper Restriction of Operations
    within the Bounds of a Memory Buffer, Resource Management Errors

2. RISK EVALUATION

Successful exploitation of these vulnerabilities may allow arbitrary code
execution, a partial denial-of-service condition, or information disclosure.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following Siemens products are affected:

  o SIMATIC FieldPG M5: All versions prior to v22.01.06,
  o SIMATIC IPC427E: All versions prior to v21.01.09,
  o SIMATIC IPC477E: All versions prior to v21.01.09,
  o SIMATIC IPC547E: All versions prior to R1.30.0,
  o SIMATIC IPC547G: All versions prior to R1.23.0,
  o SIMATIC IPC627D: All versions prior to v19.02.11,
  o SIMATIC IPC647D: All versions prior to v19.01.14,
  o SIMATIC IPC677D: All versions prior to v19.02.11,
  o SIMATIC IPC827D: All versions prior to v19.02.11,
  o SIMATIC IPC847D: All versions prior to v19.01.14, and
  o SIMATIC ITP1000: All versions prior to v23.01.04

3.2 VULNERABILITY OVERVIEW

3.2.1 CRYPTOGRAPHIC ISSUES CWE-310

A Bleichenbacher-style side channel vulnerability in TLS implementation in
Intel Active Management Technology before v12.0.5 may allow an unauthenticated
user to obtain the TLS session key via the network.

CVE-2018-3616 has been assigned to this vulnerability. A CVSS v3 base score of
5.9 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/
C:H/I:N/A:N ).

3.2.2 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER
CWE-119

Multiple buffer overflows in Intel AMT in Intel CSME firmware versions before
12.0.5 may allow a privileged user to execute arbitrary code with Intel AMT
execution privilege via local access.

CVE-2018-3657 has been assigned to this vulnerability. A CVSS v3 base score of
6.7 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:H/UI:N/S:U/
C:H/I:H/A:H ).

3.2.3 RESOURCE MANAGEMENT ERRORS CWE-399

Multiple memory leaks in Intel AMT in Intel CSME firmware versions before
12.0.5 may allow an unauthenticated user with Intel AMT provisioned to cause a
partial denial-of-service condition via network access.

CVE-2018-3658 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:L ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy,
    Food and Agriculture, Water and Wastewater 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 upgrade to the latest version. Additional information
as well as upgrades can be found at the following link.

https://support.industry.siemens.com/cs/us/en/view/109747626

The vulnerabilities are resolved in the following versions for each product
listed:

  o v22.01.06
       SIMATIC FieldPG M5

https://support.industry.siemens.com/cs/document/109738122/
simatic-field-pg-m5-latest-bios-versiondti=0&lc=en-US

  o V21.01.09
       SIMATIC IPC427E
       SIMATIC IPC477E

https://support.industry.siemens.com/cs/document/109742593/simatic-ipc427e-
(microbox-pc)-ipc-477e-ipc477e-pro-latest-bios-versiondti=0&lc=en-US

  o R1.30.0
       SIMATIC IPC547E

https://support.industry.siemens.com/cs/document/109481624/
simatic-ipc547e-latest-bios-versiondti=0&lc=en-US

  o R1.23.0
       SIMATIC IPC547G

https://support.industry.siemens.com/cs/document/109750349/
simatic-ipc547g-latest-bios-versiondti=0&lc=en-US

  o V19.02.11
       SIMATIC IPC627D
       SIMATIC IPC677D
       SIMATIC IPC827D

https://support.industry.siemens.com/cs/document/109474954/simatic-ipc627d-
(box-pc)-ipc677d-ipc827d-(box-pc)-latest-bios-versiondti=0&lc=en-US

  o V19.01.14
       SIMATIC IPC647D
       SIMATIC IPC847D

https://support.industry.siemens.com/cs/document/109037779/
simatic-ipc647d-ipc847d-(rack-pc)-latest-bios-versiondti=0&lc=en-US

  o V23.01.04
       SIMATIC ITP1000

https://support.industry.siemens.com/cs/document/109748173/
simatic-itp1000-latest-bios-versiondti=0&lc=en-US

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

  o As a prerequisite for an attack, an attacker must be able to run malicious
    code on affected systems. Therefore, Siemens recommends determining if it
    is possible that untrusted code can be run on these systems, or if existing
    measures implemented by the operator reduce the likelihood of untrusted
    code being run.

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 e the environment
according to Siemens' operational guidelines for Industrial Security (Download:
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 additional information see Siemens' security advisory SSA-377318 at the
following location:

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

Additional information regarding the Intel Active Management Technology (AMT)
see:

https://www.intel.com/content/www/us/en/security-center/advisory/
intel-sa-00141.html

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.

NCCIC also recommends that users take the following measures to protect
themselves from social engineering attacks:

  o Do not click web links or open unsolicited attachments in email messages.
  o Refer to Recognizing and Avoiding Email Scams for more information on
    avoiding email scams.
  o Refer to Avoiding Social Engineering and Phishing Attacks for more
    information on social engineering attacks.

No known public exploits specifically target these vulnerabilities.

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