ESB-2017.1708 - [Appliance] Siemens Reyrolle: Multiple vulnerabilities 2017-07-07

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1708
                Advisory (ICSA-17-187-02) Siemens Reyrolle
                                7 July 2017

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

Product:           Siemens Reyrolle
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Administrator Compromise -- Remote/Unauthenticated
                   Denial of Service        -- Remote/Unauthenticated
                   Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-7114 CVE-2016-7113 CVE-2016-7112
                   CVE-2016-4785 CVE-2016-4784 

Reference:         ESB-2016.2101
                   ESB-2016.1281

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-187-02

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Advisory (ICSA-17-187-02)

Siemens Reyrolle

Original release date: July 06, 2017

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/.

CVSS v3 7.5

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: Siemens

Equipment: Reyrolle

Vulnerabilities: Missing Authorization, Improper Input Validation, Improper 
Authentication

AFFECTED PRODUCTS

Siemens reports that the vulnerabilities affect the following Reyrolle 
integration, control, measurement, and automation products:

EN100 Ethernet modules as optional for Reyrolle: All versions prior to 
V4.29.01

IMPACT

Successful exploitation of these vulnerabilities could allow an attacker to 
access sensitive device information, circumvent authentication, and perform 
administrative actions.

MITIGATION

Siemens has released a new firmware version (V4.29.01) to address these 
vulnerabilities. It can be found at the SIPROTEC 4 downloads area at the 
following Siemens web site:

http://www.siemens.com/downloads/siprotec-4 (link is external)

Siemens recommends users protect network access with appropriate mechanisms 
such as firewalls, segmentation, and VPN. Siemens also advises that users 
configure the operational environment according to Siemens Operational 
Guidelines for Industrial Security. Please see the specific product manual for
more information. Manuals can be obtained from the downloads menu at the 
following Siemens web site:

http://www.siemens.com/gridsecurity (link is external)

For more information on these vulnerabilities and more detailed mitigation 
instructions, please see Siemens Security Advisory SSA-452237 at the following
location:

http://www.siemens.com/cert/advisories (link is external)

NCCIC/ICS-CERT recommends that users take defensive measures to minimize the 
risk of exploitation of these vulnerabilities. Specifically, users should:

Minimize network exposure for all control system devices and/or systems, and 
ensure that they are not accessible from the Internet.

Locate control system networks and remote devices behind firewalls, and 
isolate them from the business network.

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.

ICS-CERT reminds organizations to perform proper impact analysis and risk 
assessment prior to deploying defensive measures.

ICS-CERT 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 in the ICSCERT Technical Information Paper, 
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation 
Strategies, that is available for download from the ICS-CERT web site.

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

In addition, ICS-CERT recommends that users take the following measures to 
protect themselves from social engineering attacks:

Do not click web links or open unsolicited attachments in email messages.

Refer to Recognizing and Avoiding Email Scams for more information on avoiding
email scams.

Refer to Avoiding Social Engineering and Phishing Attacks for more information
on social engineering attacks.

No known public exploits specifically target these vulnerabilities.

VULNERABILITY OVERVIEW

MISSING AUTHORIZATION CWE-862

The integrated web server (Port 80/TCP) of the affected devices could allow 
remote attackers to obtain sensitive device information if network access was
obtained.

CVE-2016-4784 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:L/I:N/A:N).

MISSING AUTHORIZATION CWE-862

The integrated web server (Port 80/TCP) of the affected devices could allow 
remote attackers to obtain a limited amount of device memory content if 
network access was obtained.

CVE-2016-4785 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:L/I:N/A:N).

MISSING AUTHORIZATION CWE-862

Attackers with network access to the devices web interface (Port 80/TCP) could
possibly circumvent authentication and perform certain administrative 
operations.

CVE-2016-7112 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:L/I:N/A:N).

IMPROPER INPUT VALIDATION CWE-20

Specially crafted packets sent to Port 80/TCP could cause the affected device
to go into defect mode.

CVE-2016-7113 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

IMPROPER AUTHENTICATION CWE-287

Attackers with network access to the devices web interface (Port 80/TCP) could
possibly circumvent authentication and perform certain administrative 
operations. A legitimate user must be logged into the web interface for the 
attack to be successful.

CVE-2016-7114 has been assigned to this vulnerability. A CVSS v3 base score of
4.3 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N).

RESEARCHER

Siemens reported these vulnerabilities to ICS-CERT when they made firmware 
available to fix them.

BACKGROUND

Critical Infrastructure Sector: Energy

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Germany

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov (link sends e-mail)

Toll Free: 1-877-776-7585

International Callers: (208) 526-0900

For industrial control systems security information and incident reporting: 
http://ics-cert.us-cert.gov

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