Operating System:

[Win]

Published:

05 December 2016

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.2853
                     Siemens SICAM PAS Vulnerabilities
                              5 December 2016

===========================================================================

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

Product:           Siemens SICAM PAS
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Increased Privileges            -- Existing Account      
                   Modify Arbitrary Files          -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2016-9157 CVE-2016-9156 CVE-2016-8567
                   CVE-2016-8566  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-16-336-01

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Advisory (ICSA-16-336-01) 

Siemens SICAM PAS Vulnerabilities 

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

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/.

OVERVIEW 

Siemens has released an advisory to inform its users on how to 
mitigate vulnerabilities that affect SICAM PAS. Ilya Karpov and Dmitry 
Sklyarov of Positive Technologies and Sergey Temnikov and Vladimir Dashchenko
of Kaspersky Lab coordinated these vulnerabilities directly with Siemens. 
Siemens has produced an update to mitigate some of these vulnerabilities. 

Some of these vulnerabilities could be exploited remotely. 

AFFECTED PRODUCTS 

The following SICAM PAS versions are affected: SICAM PAS: All versions. 

IMPACT 

Successful exploitation of these vulnerabilities may allow an attacker to 
cause a denial-of-service condition or remotely exploit arbitrary code. 

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

BACKGROUND 

Siemens is a multinational company headquartered in Munich, Germany. 

The affected product, SICAM PAS, is energy 
automation software for operating electrical substations. According to 
Siemens, SICAM PAS is deployed across the Energy sector. Siemens estimates 
that this product is used worldwide. 

VULNERABILITY CHARACTERIZATION
 
VULNERABILITY OVERVIEW

USE OF HARD-CODED CREDENTIALS[a] A factory account with 
hard-coded passwords is present in the SICAM PAS installations. Attackers 
might gain privileged access to the database over Port 2638/TCP. SICAM PAS 
Versions 8.00 and higher are not affected by this vulnerability. 
CVE-2016-8567[b] has been assigned to this vulnerability. A CVSS v3 base score 
of 9.8 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).[c] 

STORING PASSWORDS IN A RECOVERABLE FORMAT[d]
An authenticated local attacker with certain privileges could possibly
reconstruct the passwords of users for accessing the database. SICAM PAS 
Versions 8.00 and higher are not affected by this vulnerability. 
CVE-2016-8566[e] has been assigned to this vulnerability. A CVSS v3 base score 
of 7.8 has been calculated; the CVSS vector string is 
(AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).[f] 

FILES OR DIRECTORIES ACCESSIBLE TO EXTERNAL PARTIES[g] 
A remote attacker could use specially crafted packets sent 
to Port 19235/TCP to upload, download, or delete files in certain parts of the
file system. CVE-2016-9156[h] has been assigned to this vulnerability. A CVSS v3
base score of 7.3 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).[i]
 
WEAKNESSES THAT AFFECT MEMORY[j] 
Specially crafted packets sent to port 19234/TCP could cause a denial of 
service condition and potentially lead to unauthenticated remote code 
execution. CVE-2016-9157[k] has been assigned to this vulnerability. A CVSS v3 
base score of 9.8 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).[l] 

VULNERABILITY DETAILS 

EXPLOITABILITY 

Some of these vulnerabilities could be exploited remotely. 

EXISTENCE OF EXPLOIT 

No known public exploits specifically target these vulnerabilities. 

DIFFICULTY 

An attacker with low skill would be able to exploit these 
vulnerabilities. 

MITIGATION 

SICAM PAS Versions 8.00 and higher fix some of 
these vulnerabilities. Siemens recommends that users upgrade to the latest 
version. In order to receive the SICAM PAS V8.08 update, please contact the 
Siemens Energy Customer Support Center at support.energy@siemens.com (link 
sends e-mail). 

For the remaining vulnerabilities Siemens recommends users 
explicitly block access to Ports 19235/TCP and 19234/TCP with appropriate 
mechanism, e.g., using the Windows firewall, until patches are available. 

Siemens strongly recommends users protect network access with appropriate 
mechanisms (e.g., firewalls, segmentation, VPN). Siemens also advises that 
users configure the operational environment according to Siemens Operational 
Guidelines for Industrial Security: 

https://www.siemens.com/cert/operational-guidelines-industrial-security (link
is external) 

For more information on this vulnerability and more detailed 
mitigation instructions, please see Siemens Security Advisory SSA-946325 at 
the following location: 

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

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. 

a. 
CWE-798: Use of Hard-coded Credentials, 
https://cwe.mitre.org/data/definitions/798.html, web site last accessed 
December 01, 2016. 
b.
NVD, 
https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-8567, 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:N/UI:N/S..., 
web site last accessed December 01, 2016. 
d. 
CWE-257: Storing Passwords in a Recoverable Format, 
https://cwe.mitre.org/data/definitions/257.html, web site last accessed 
December 01, 2016. 
e. 
NVD,https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-8566, NIST uses 
this advisory to create the CVE web site report. This web site will be active 
sometime after publication of this advisory. 
f. 
CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S..., 
web site last accessed December 01, 2016. 
g. 
CWE-552: Files or Directories Accessible to External Parties, 
https://cwe.mitre.org/data/definitions/552.html, web site last accessed 
December 01, 2016. 
h. 
NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9156, NIST uses 
this advisory to create the CVE web site report. This web site will be active 
sometime after publication of this advisory. 
i. 
CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., 
web site last accessed December 01, 2016. 
j. 
CWE-633: Weaknesses that Affect 
Memory, https://cwe.mitre.org/data/definitions/633.html, web site last 
accessed December 01, 2016. 
k. 
NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9157, NIST uses 
this advisory to create the CVE web site report. This web site will be active 
sometime after publication of this advisory. 
l. 
CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., 
web site last accessed December 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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