-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 # SSA-419820: Denial-of-Service Vulnerability in TIM 1531 IRC Publication Date: 2021-06-08 Last Update: 2021-06-08 Current Version: 1.0 CVSS v3.1 Base Score: 7.5 SUMMARY ======= The latest update for TIM 1531 IRC fixes a vulnerability that could allow a remote attacker to cause a denial-of-service under certain circumstances. Siemens has released an update for the TIM 1531 IRC and recommends to update to the latest version. AFFECTED PRODUCTS AND SOLUTION ============================== * TIM 1531 IRC (incl. SIPLUS NET variants) - Affected versions: All versions < V2.2 - Remediation: Update to V2.2 or later version - Download: https://support.industry.siemens.com/cs/ww/en/view/109798331 WORKAROUNDS AND MITIGATIONS =========================== Siemens has not identified any additional specific mitigations or workarounds. Please follow "General Security Recommendations". Product specific mitigations can be found in the section "Affected Products and Solution". GENERAL SECURITY RECOMMENDATIONS ================================ As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity PRODUCT DESCRIPTION =================== TIM 1531 IRC is a communication module for SIMATIC S7-1500, S7-400, S7-300 with SINAUT ST7, DNP3 and IEC 60870-5-101/104 with three RJ45 interfaces for communication via IP-based networks (WAN / LAN) and a RS 232/RS 485 interface for communication via classic WAN networks. SIPLUS extreme products are designed for reliable operation under extreme conditions and are based on SIMATIC, LOGO!, SITOP, SINAMICS, SIMOTION, SCALANCE or other devices. SIPLUS devices use the same firmware as the product they are based on. VULNERABILITY CLASSIFICATION ============================ The vulnerability classification has been performed by using the CVSS scoring system in version 3.1 (CVSS v3.1) (https://www.first.org/cvss/). The CVSS environmental score is specific to the customer's environment and will impact the overall CVSS score. The environmental score should therefore be individually defined by the customer to accomplish final scoring. An additional classification has been performed using the CWE classification, a community-developed list of common software security weaknesses. This serves as a common language and as a baseline for weakness identification, mitigation, and prevention efforts. A detailed list of CWE classes can be found at: https://cwe.mitre.org/. * Vulnerability CVE-2018-0732 During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. CVSS v3.1 Base Score: 7.5 CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C CWE: CWE-400: Uncontrolled Resource Consumption ADDITIONAL INFORMATION ====================== For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories HISTORY DATA ============ V1.0 (2021-06-08): Publication Date TERMS OF USE ============ Siemens Security Advisories are subject to the terms and conditions contained in Siemens' underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter "License Terms"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens' Global Website (https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use. -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEElTRCLAVwzKf/b8X80/SB6hFKr+QFAmC+swAACgkQ0/SB6hFK r+TQhA//SilFeqIl+UGHNPOonfCUWCu6m98iqDcfbXPFfz4E++JAmaebAK1t1zHS EzfxjsK31fX5fvKPFHUpK0FCSF4qU8YbdGxuEJz5suEVBILiNVS/8w7T/YcGJ3U9 3/Zb/uq8ckRpx77xCUm06/W/vM8yNDjqLVAfyBNVljccJs311j5IF+kS3WZqZK0J OsDBz5/ys5wGwOJxhvx/xYme/bqVSK4kK3xifcVBpgsZMZglIRHKRskS4TgRPgJM wyzdIfYO6nuLXJuU6KigLGwZduKT07k9WATeW+4sl4JTtVtk6hbOVD0l9u+O9U5J 7x3DUE32PPTkaWscRrskduM6OvgOxSbiIkOLQHO88wGD5SGiGoGa1ofEI2sBe8Dt rrqC6KOzCMoxc8jN+/NhBjB7yjHeGCylBmSAQQgeQ/cJwpTreS7RIl3yQLjM1fkU YYGXzepvjSyUsT1Iw5CMv28tQejP/dWpxroaC28Ehc0B5IXuPpQFL2Y1yf/72sAs E/C7wkzG/VZSoDuEOWxir4VezmtzpRbcbcAgLDSBeNB1RLyeTG62sZegaGhCxccJ 9hYU+9BVv0du7fMZrvSrtCBBEUuTi9aV2TnfMgosDcke+38x3/PIXJJYu6e16NOh Kq58bIiZ0LEG7zbgPWkWlr1FO7AcNhZdDUaJ5bvGmbJboeq4TsI= =oJiC -----END PGP SIGNATURE-----