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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0126 Advisory (icsa-21-012-04) Siemens Solid Edge 13 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens Solid Edge Publisher: CS-CERT Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-28386 CVE-2020-28384 CVE-2020-28383 CVE-2020-28382 CVE-2020-28381 CVE-2020-26989 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-012-04 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-012-04) Siemens Solid Edge Original release date: January 12, 2021 Legal Notice All information products included in https://us-cert.cisa.gov/ics 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 https://us-cert.cisa.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 7.8 o ATTENTION: Low skill level to exploit o Vendor: Siemens o Equipment: Solid Edge o Vulnerabilities: Out-of-bounds Write, Stack-based Buffer Overflow 2. RISK EVALUATION Successful exploitation of these vulnerabilities could allow arbitrary code execution on an affected system. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Solid Edge, a portfolio of software tools, are affected: o Solid Edge: All versions prior to SE2021MP2 3.2 VULNERABILITY OVERVIEW 3.2.1 OUT-OF-BOUNDS WRITE CWE-787 The affected applications lack proper validation of user-supplied data when parsing PAR files. This could result in an out-of-bounds write into uninitialized memory. An attacker could leverage this vulnerability to execute code in the context of the current process. CVE-2020-28381 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:N/UI:R/S:U/ C:H/I:H/A:H ). 3.2.2 OUT-OF-BOUNDS WRITE CWE-787 The affected applications lack proper validation of user-supplied data when parsing PAR files. This could result in an out-of-bounds write past the end of an allocated structure. An attacker could leverage this vulnerability to execute code in the context of the current process. CVE-2020-28382 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:N/UI:R/S:U/ C:H/I:H/A:H ). 3.2.3 OUT-OF-BOUNDS WRITE CWE-787 The affected applications lack proper validation of user-supplied data when parsing PAR files. This can result in an out-of-bounds write past the memory location of a read only image address. An attacker could leverage this vulnerability to execute code in the context of the current process. CVE-2020-28383 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:N/UI:R/S:U/ C:H/I:H/A:H ). 3.2.4 STACK-BASED BUFFER OVERFLOW CWE-121 The affected applications lack proper validation of user-supplied data when parsing PAR files. This could lead to a stack-based buffer overflow. An attacker could leverage this vulnerability to execute code in the context of the current process. CVE-2020-28384 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:N/UI:R/S:U/ C:H/I:H/A:H ). 3.2.5 OUT-OF-BOUNDS WRITE CWE-787 The affected applications lack proper validation of user-supplied data when parsing DFT files. This could result in an out-of-bounds write past the end of an allocated structure. An attacker could leverage this vulnerability to execute code in the context of the current process. CVE-2020-28386 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:N/UI:R/S:U/ C:H/I:H/A:H ). 3.2.6 STACK-BASED BUFFER OVERFLOW CWE-121 The affected applications lack proper validation of user-supplied data when parsing of PAR files. This could result in a stack-based buffer overflow. An attacker could leverage this vulnerability to execute code in the context of the current process. CVE-2020-26989 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:N/UI:R/S:U/ C:H/I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER rgod, working with Trend Micro's Zero Day Initiative, reported these vulnerabilities to CISA. 4. MITIGATIONS Siemens has published a security advisory and released an update to Version SE2021MP2 or later for Solid Edge and recommends users update to the latest version (login required). Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk: o Siemens recommends limiting opening of untrusted files from unknown sources in Solid Edge. o Applying a defense-in-depth concept can help to reduce the probability untrusted code is run on the system. Siemens recommends applying the defense-in-depth concept. As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemens' operational guidelines for Industrial Security , and follow the recommendations in the product manual. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity For more information about this issue, please see Siemens security advisory SSA-979834 CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.cisa.gov . 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 on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies . Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents. CISA also recommends users take the following measures to protect themselves from social engineering attacks: o Do not click web links or open unsolicited attachments in email messages. o Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. o Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploits specifically target these vulnerabilities. These vulnerabilities are not exploitable remotely. For any questions related to this report, please contact the CISA at: Email: CISAservicedesk@cisa.dhs.gov Toll Free: 1-888-282-0870 CISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product. - --------------------------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. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBX/6VPONLKJtyKPYoAQgscA//bEaA/t1J5MosfYPONcKmhGnWz5cYD4JV f1rytoNnyGdhf2WyflEkOxKB/IuIPr9/ZrqViP6UgNmAYgj5XQbRUSqU8nsrukBe xTB40+7fl3bQWQ9Up570OTTu8cMteE7F8vUbKPJ2SmZ0jDn8vAJ7vGJgeWmRpsvo KUtVAMyEdHB/d795wyQrj2CPm+29CckNMnj/IdPe/6iqtHzbuRW9q/2wLUSrSFFq j/QcG3hlq+3Ld0UtXFScl6a6rlInnyGIEwniO1U6J2hwcC6wZLTvJrOWUDHPePSa MGFcuKlVv0JNzzp+seaHZIPA+rpvoG143rBXOe1AP2kT+tWBG/j/iyGJIseSNHZj 6okiPrKox7ShxQSdXibQCuq558YFSHE25dmacukKYAt2k7NyNY5E7pv7wrMWhXHp 361CeDe30uX2okEDamYwBACh3Z87/4Op32caxsFMgr+PWKltzGhd5hKlAu+Hemth qvUcDnYD0pLbO5G4HAwfiuw1dxUq8jHig6FjKxlCko1syNzTQwTOq95IZE3KCk6v RXOIJ2/AigcuihqbZ6pzO0w2dsdRVhDCPiSqn9olauuPtBGfKC5veDtry/uWCgz0 Odj4QZdIL9nMi0GfuOXn555sWPGm0mGCkYLcdWGvPATOAT6Z01Jv5K3dWb5A41CF bmn7SBErzo0= =zhP6 -----END PGP SIGNATURE-----