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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0564
   Schneider Electric Building Operation Automation Server Vulnerability
                               3 March 2016

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

Product:           Schneider Electric Building Operation Automation Server
Publisher:         US-CERT
Operating System:  Linux variants
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-2278  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-16-061-01

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Advisory (ICSA-16-061-01)

Schneider Electric Building Operation Automation Server Vulnerability

Original release date: March 01, 2016 | Last revised: March 02, 2016

Legal Notice

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(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/.

OVERVIEW

Independent researcher Karn Ganeshen has identified a vulnerability in servers
programmed with Schneider Electrics StruxureWare Building Operation software.
Schneider Electric has produced a new version to mitigate this vulnerability.

This vulnerability could be exploited remotely.

AFFECTED PRODUCTS

Schneider Electric reports that the vulnerability affects the following 
products from the StruxureWare Building Operations line:

Automation Server, V1.7.0 and prior.

IMPACT

A malicious authenticated user could exploit this vulnerability to circumvent
the Linux operating system's user access controls.

Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC/ICS-CERT recommends that organizations evaluate the 
impact of this vulnerability based on their operational environment, 
architecture, and product implementation.

BACKGROUND

Schneider Electrics corporate headquarters is located in Paris, France, and it
maintains offices in more than 100 countries worldwide.

The affected product, Automation Server, is a building automation system for 
small and medium-sized buildings. According to Schneider Electric, Automation
Server is deployed in the Commercial Facilities sector. Schneider Electric 
estimates that this product is used worldwide.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

OS COMMAND INJECTION[a]

Some functions can allow administrative users to circumvent the Linux 
operating system's user access controls.

CVE-2016-2278[b] has been assigned to this vulnerability. A CVSS v3 base score 
of 7.2 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).[c]

VULNERABILITY DETAILS

EXPLOITABILITY

This vulnerability could be exploited remotely.

EXISTENCE OF EXPLOIT

No known public exploits specifically target this vulnerability.

DIFFICULTY

A malicious authenticated user with a low skill would be able to exploit this
vulnerability.

MITIGATION

Schneider Electric has released a new version of Automation Server firmware 
which remediates this vulnerability. The user is no longer allowed to operate
the system with default credentials and the minimal msh shell can no longer be
circumvented. Users should contact their authorized Schneider Electric service
channel to access the firmware update.

For more information, please see Schneider Electrics Security Notification 
number SEVD-2016-025-01 at the following location on their web site:

http://www.schneider-electric.com/ww/en/download/document/SEVD-2016-025-01 
(link is external)

ICS-CERT recommends that users take defensive measures to minimize the risk of
exploitation of this vulnerability. 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 at: 
http://ics-cert.us-cert.gov/content/recommended-practices. 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 
(http://ics-cert.us-cert.gov/).

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.

a. CWE-78: Improper Neutralization of Special Elements used in an OS Command 
(OS Command Injection), http://cwe.mitre.org/data/definitions/78.html, web 
site last accessed March 01, 2016

b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-2278, NIST 
uses this advisory to create the CVE web site report. This web site will be 
active sometime after publication of this advisory.

c. CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S..., 
web site last accessed March 01, 2016.

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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