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AUSCERT External Security Bulletin Redistribution
ESB-2018.0996
Advisory (ICSA-18-093-01) Siemens Building Technologies Products Original
4 April 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens Building Technologies Products
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-12822 CVE-2017-12821 CVE-2017-12820
CVE-2017-12819 CVE-2017-12818 CVE-2017-11498
CVE-2017-11497 CVE-2017-11496
Reference: ESB-2018.0208.2
ESB-2018.0340
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-18-093-01
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Advisory (ICSA-18-093-01) Siemens Building Technologies Products Original
release date: April 03, 2018
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/.
1. EXECUTIVE SUMMARY
CVSS v3 9.8
ATTENTION: Exploitable remotely/low skill level to exploit.
Vendor: Siemens
Equipment: Building Technologies Products
Vulnerabilities: Stack-based Buffer Overflows, Security Features, Improper
Restriction of Operations within the Bounds of a Memory Buffer, NULL Pointer
Dereference, XML Entity Expansion, Heap-based Buffer Overflow, Improper Access
Control
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may allow arbitrary code
execution, NTLM-relay attacks, remote code execution, denial of service, or
increased attack surface.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Siemens License Management System (LMS), which includes a vulnerable version
of Gemalto Sentinel LDK RTE, is used by the following Siemens products and
solutions:
License Management System (LMS) All versions prior to V2.1 SP3(2.1.670)
Annual Shading V1.0.4 and 1.1
Desigo ABT Versions
MP1.1 Build 845
MP1.15 Build 360
MP1.16 Build 055
MP1.2 Build 850
MP1.2.1 Build 318
MP2.1 Build 965
Desigo CC Versions
MP1.1
MP2.0
MP2.1
MP3.0
Desigo Configuration Manager (DCM) V6.10.140
Desigo XWP
V5.00.204
V5.00.260
V5.10.142
V5.10.212
V6.00.184
V6.00.342
V6.10.172
SiteIQ Analytics
V1.1
V1.2
V1.3
Siveillance Identity V1.1
3.2 VULNERABILITY OVERVIEW
3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121
Malformed ASN1 streams in V2C and similar input files can be used to generate
stack-based buffer overflows. The vulnerability could allow arbitrary code
execution.
CVE-2017-11496 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).
3.2.2 STACK-BASED BUFFER OVERFLOW CWE-121
Language packs containing malformed filenames could lead to a stack-based
buffer overflow. The vulnerability could allow arbitrary code execution.
CVE-2017-11497 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).
3.2.3 SECURITY FEATURES CWE-254
Remote manipulation of the language pack updater could allow NTLM-relay
attacks.
CVE-2017-12819 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).
3.2.4 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER
CWE-119
A memory corruption flaw could allow remote code execution.
CVE-2017-12821 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).
3.2.5 NULL POINTER DEREFERENCE CWE-476
Zipped language packs with invalid HTML files could lead to NULL pointer
access. The vulnerability could cause denial of service of the remote process.
CVE-2017-11498 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).
3.2.6 IMPROPER RESTRICTION OF RECURSIVE ENTITY REFERENCES IN DTDS ('XML ENTITY
EXPANSION') CWE-776
A stack overflow flaw in the custom XML-parser could allow remote denial of
service.
CVE-2017-12818 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).
3.2.7 HEAP-BASED BUFFER OVERFLOW CWE-122
Arbitrary memory read from controlled memory pointer could allow remote denial
of service.
CVE-2017-12820 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).
3.2.8 IMPROPER ACCESS CONTROL CWE-284
The administrative interface can be remotely enabled and disabled without
authentication. This could increase the attack surface.
CVE-2017-12822 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:N/I:L/A:N).
3.3 BACKGROUND
Critical Infrastructure Sectors: Commercial Facilities
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
3.4 RESEARCHER
Sergey Temnikov and Vladimir Dashchenko from Kaspersky Labs reported these
vulnerabilities to Siemens.
4. MITIGATIONS
Siemens recommends that users upgrade License Management System (LMS) to
version 2.1 SP4 (2.1.681) or newer. To do so, users should contact the local
Siemens representative or Siemens customer support.
NOTE: Users using Desigo CC MP2.1 or older need to upgrade ALM Manager before
applying the update to LMS.
Siemens has released the following advisory:
https://cert-portal.siemens.com/productcert/pdf/ssa-727467.pdf (link is
external)
NCCIC 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.
NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
NCCIC 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 website.
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to NCCIC for
tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
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