ESB-2017.1800 - [Win] Schneider Electric PowerSCADA Anywhere and Citect Anywhere: Multiple vulnerabilities 2017-07-21

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1800
          Advisory (ICSA-17-201-01) Schneider Electric PowerSCADA
                       Anywhere and Citect Anywhere
                               21 July 2017

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

Product:           Schneider Electric PowerSCADA Anywhere
                   Schneider Electric Citect Anywhere
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Cross-site Scripting           -- Remote with User Interaction
                   Provide Misleading Information -- Remote/Unauthenticated      
                   Reduced Security               -- Existing Account            
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-7972 CVE-2017-7971 CVE-2017-7970
                   CVE-2017-7969  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-201-01

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Advisory (ICSA-17-201-01)

Schneider Electric PowerSCADA Anywhere and Citect Anywhere

Original release date: July 20, 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 8.1

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: Schneider Electric

Equipment: PowerSCADA Anywhere and Citect Anywhere

Vulnerabilities: Information Exposure, Cross-Site Request Forgery, Improper 
Neutralization of Expression, Improper Validation of Certificate Expiration

AFFECTED PRODUCTS

Schneider Electric reports that the vulnerabilities affect the following 
versions of PowerSCADA Anywhere and Citect Anywhere mobile extensions:

Version 1.0 of PowerSCADA Anywhere redistributed with PowerSCADA Expert v8.1 
and PowerSCADA Expert v8.2,

Citect Anywhere version 1.0

IMPACT

Successful exploitation of these vulnerabilities could allow an attacker to 
perform actions on behalf of a legitimate user, perform network 
reconnaissance, or gain access to resources beyond those intended with normal
operation of the product.

MITIGATION

Schneider Electric strongly recommends that users upgrade their systems as 
soon as possible. The following provides links to instructions for addressing
software that is at potential risk for the vulnerabilities:

PowerSCADA Anywhere Version 1 used with PowerSCADA Expert v8.2 and PowerSCADA
Expert v8.1: Uninstall PowerSCADA Anywhere (from Add/Remove Programs). Then 
install PowerSCADA Anywhere Version 1.1 available in the following location:

https://schneider-electric.box.com/shared/static/3tvcc115kax8volhd8i13e4wg5k1sdel.iso
(link is external)

Citect Anywhere version 1.1:

https://www.citect.schneider-electric.com/scada/citectscada/downloads-updates/product-downloads?tab=extra_products
(link is external)

In addition to installing the provided security patch, Schneider Electric 
recommends that the following steps be taken to further harden the system:

Configure the HTTP origin header whitelist to match the environment's URL(s) 
used for accessing the secure gateway. This address may be one or more of the
IP, machine name, or domain name where the secure gateway is hosted. The 
address may also be that of a load balancer or proxy, if the secure gateway is
deployed that way.

Configure the secure gateway's whitelists to restrict access to expected 
client IPs, as well as to restrict access from the secure gateway to only 
expected internal server hosts. For an additional defense-in-depth layer, 
users can further use the Windows OS-level firewall (or zone firewalls) to 
restrict communication among only the expected nodes.

If using self-signed certificates, configure the secure gateway machine to 
trust the server certificate.

Depending on the organization's requirements, users can further configure the
secure gateway to restrict the usable TLS protocols. For an additional 
defense-in-depth layer, TLS protocols and cipher suites can also be restricted
at the operating system level through the use of third party tools such as 
IISCrypto.

Create unique user accounts with minimal privileges dedicated to accessing 
applications remotely. OS group policy objects can be used to further restrict
what those unique user accounts are allowed to do. For an example 
configuration that disables task manager from being launched in a remote app 
connection, follow the steps available here:

https://social.technet.microsoft.com/Forums/office/en-US/35dd3cd6-cc67-476f-82e2-058293e6f657/how-do-i-disable-task-manager-for-users-only?forum=winserverTS
(link is external)

For more information about the vulnerabilities and patch in PowerSCADA 
Anywhere, please refer to Schneider Electric Security Notification - 
PowerSCADA Anywhere SEVD-2017-173-01, which is available at the following 
location:

http://www.schneider-electric.com/en/download/document/SEVD-2017-173-01/ (link
is external)

For more information about the vulnerabilities and patch in Citect Anywhere, 
please refer to Schneider Electric Security Notification - Citect Anywhere, 
which is available at the following location:

https://www.citect.schneider-electric.com/safety-and-security-notifications/36-security-notifications/9071-security-notification-citect-anywhere
(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 ICS-CERT 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

CROSS-SITE REQUEST FORGERY (CSRF) CWE-352

The secure gateway component of the affected products is vulnerable to CSRF 
for multiple state-changing requests. This type of attack requires some level
of social engineering in order to get a legitimate user to click on or access
a malicious link/site containing the CSRF attack.

CVE-2017-7969 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N).

INFORMATION EXPOSURE CWE-200

An attacker on an adjacent network may be able to specify arbitrary server 
target nodes in connection requests to the secure gateway and server 
components.

CVE-2017-7970 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated; the CVSS vector string is 
(AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

IMPROPER VALIDATION OF CERTIFICATE EXPIRATION CWE-298

The affected products use outdated cipher suites and improperly verify peer 
SSL certificates.

CVE-2017-7971 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:H/PR:L/UI:N/S:U/C:H/I:N/A:N).

IMPROPER NEUTRALIZATION OF EXPRESSION/COMMAND DELIMITERS CWE-146

An attacker on an adjacent network may be able to escape out of remote 
applications and launch other processes.

CVE-2017-7972 has been assigned to this vulnerability. A CVSS v3 base score of
5.5 has been calculated; the CVSS vector string is 
(AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L).

RESEARCHER

Schneider Electric notified ICS-CERT of these vulnerabilities after they made
the fixes available.

BACKGROUND

Critical Infrastructure Sectors: Commercial Facilities

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Paris, France

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

ICS-CERT continuously strives to improve its products and services. You can 
help by choosing one of the links below to provide feedback about this 
product.

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