CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L
EPSS
Percentile
95.9%
This updated advisory is a follow-up to the original advisory titled ICSA-18-093-01 Siemens Building Technologies Products that was published April 3, 2018, on the NCCIC/ICS-CERT website.
Successful exploitation of these vulnerabilities may allow arbitrary code execution, NTLM-relay attacks, remote code execution, denial of service, or increased attack surface.
Siemens License Management System (LMS), which includes a vulnerable version of Gemalto Sentinel LDK RTE, is used by the following Siemens products and solutions:
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).
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).
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).
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).
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).
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).
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).
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).
Sergey Temnikov and Vladimir Dashchenko from Kaspersky Labs reported these vulnerabilities to Siemens.
--------- Begin Update A Part 1 of 1 --------
Siemens recommends that users upgrade License Management System (LMS) to version 2.1 SP4 (2.1.681) or newer. To do so, users should follow the instructions at <https://support.industry.siemens.com/cs/document/109479834> or contact the local Siemens representative or Siemens customer support.
--------- End Update A Part 1 of 1 --------
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>
NCCIC recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
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 ICSβCERT Technical Information Paper, ICS-TIP-12-146-01BβTargeted 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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-11496
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-11497
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-11498
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12818
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12819
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12820
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12821
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12822
cert-portal.siemens.com/productcert/pdf/ssa-727467.pdf
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cwe.mitre.org/data/definitions/776.html
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L
EPSS
Percentile
95.9%