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AUSCERT External Security Bulletin Redistribution
ESB-2015.1881
Siemens SICAM MIC Authentication Bypass Vulnerability
16 July 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens SICAM MIC
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-5386
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-15-195-01
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Advisory (ICSA-15-195-01)
Siemens SICAM MIC Authentication Bypass Vulnerability
Original release date: July 14, 2015
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 identified an authentication bypass vulnerability in its SICAM MIC
telecontrol device. This vulnerability was reported directly to Siemens by
Philippe Oechslin from Objectif Scurit. Siemens has produced a new firmware
update to mitigate this vulnerability.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
Siemens reports that the vulnerability affects the following versions of SICAM
MIC:
SICAM MIC: All versions prior to V2404.
IMPACT
A remote attacker may be able to exploit this vulnerability to perform
administrative operations.
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
Siemens is a multinational company headquartered in Munich, Germany.
The Siemens SICAM MIC is a modular telecontrol device for energy automation
that belongs to the SICAM RTU product family. According to Siemens, SICAM MIC
products are deployed across several sectors including Energy. Siemens
estimates that these products are used worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
AUTHENTICATION BYPASS ISSUES [a]
Attackers with network access to the devices web interface (Port 80/TCP) could
possibly circumvent authentication and perform administrative operations. A
legitimate user must be logged into the web interface for the attack to be
successful.
CVE-2015-5386 [b] has been assigned to this vulnerability. A CVSS v2 base
score of 8.3 has been assigned; the CVSS vector string is
(AV:N/AC:M/Au:N/C:P/I:P/A:C). [c]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
An attacker with medium skill would be able to exploit this vulnerability.
MITIGATION
Siemens provides firmware update V2404, which fixes the vulnerability and
contains further security improvements. Siemens recommends that customers
update to the latest firmware version. The firmware update for SICAM MIC can
be found at the following location on the Siemens web site:
http://w3.siemens.com/smartgrid/global/en/products-systems-solutions/substation-automation/remote-terminal-units/Pages/SICAM-MIC.aspx
For more information on this vulnerability and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-632547 at the following
location:
http://www.siemens.com/cert/advisories
ICS-CERT recommends that users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:
Configure firewall rules to appropriately restrict traffic to affected
devices on Port 80/TCP.
Monitor traffic to affected devices on Port 80/TCP with an intrusion
detection system (IDS).
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 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
(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-592: Authentication Bypass Issues,
http://cwe.mitre.org/data/definitions/592.html, web site last accessed July
14, 2015.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-5386,
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,
http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:P/I:P/A:C, web
site last accessed July 14, 2015.
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov
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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