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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.0996 Advisory (ICSA-18-093-01) Siemens Building Technologies Products Original 4 April 2018 =========================================================================== 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 - --------------------------BEGIN INCLUDED TEXT-------------------- 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. 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