CVE-2021-31892 in SINUMERIK Analyse MyCondition
Summary
by MITRE • 07/13/2021
A vulnerability has been identified in SINUMERIK Analyse MyCondition (All versions), SINUMERIK Analyze MyPerformance (All versions), SINUMERIK Analyze MyPerformance /OEE-Monitor (All versions), SINUMERIK Analyze MyPerformance /OEE-Tuning (All versions), SINUMERIK Integrate Client 02 (All versions >= V02.00.12 < 02.00.18), SINUMERIK Integrate Client 03 (All versions >= V03.00.12 < 03.00.18), SINUMERIK Integrate Client 04 (V04.00.02 and all versions >= V04.00.15 < 04.00.18), SINUMERIK Integrate for Production 4.1 (All versions < V4.1 SP10 HF3), SINUMERIK Integrate for Production 5.1 (V5.1), SINUMERIK Manage MyMachines (All versions), SINUMERIK Manage MyMachines /Remote (All versions), SINUMERIK Manage MyMachines /Spindel Monitor (All versions), SINUMERIK Manage MyPrograms (All versions), SINUMERIK Manage MyResources /Programs (All versions), SINUMERIK Manage MyResources /Tools (All versions), SINUMERIK Manage MyTools (All versions), SINUMERIK Operate V4.8 (All versions < V4.8 SP8), SINUMERIK Operate V4.93 (All versions < V4.93 HF7), SINUMERIK Operate V4.94 (All versions < V4.94 HF5), SINUMERIK Optimize MyProgramming /NX-Cam Editor (All versions). Due to an error in a third-party dependency the ssl flags used for setting up a TLS connection to a server are overwitten with wrong settings. This results in a missing validation of the server certificate and thus in a possible TLS MITM szenario.
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Analysis
by VulDB Data Team • 07/16/2021
This vulnerability affects multiple Siemens SINUMERIK products that utilize third-party dependencies for establishing secure TLS connections. The flaw resides in how SSL/TLS flags are configured during connection setup, specifically when these flags are overwritten with incorrect settings that disable proper server certificate validation. This represents a critical security weakness that directly impacts the integrity of secure communications within industrial automation environments. The vulnerability stems from improper handling of cryptographic parameters that should enforce certificate verification but instead allow connections to proceed without validating the authenticity of the remote server.
The technical implementation flaw involves the manipulation of SSL/TLS configuration parameters that control certificate validation behavior. When these flags are overwritten with incorrect values, the system fails to perform mandatory certificate chain validation, allowing attackers to potentially intercept communications through man-in-the-middle attacks. This misconfiguration creates a scenario where the client accepts any certificate presented by a malicious server, effectively nullifying the security benefits of TLS encryption. The vulnerability impacts a broad range of Siemens industrial software products, including analytics, performance monitoring, machine management, and operational tools, all of which rely on secure communication channels for their functionality.
The operational impact of this vulnerability is severe within industrial control systems environments where these Siemens products are deployed. Attackers could exploit this weakness to conduct passive eavesdropping on communications between industrial systems and remote monitoring servers, potentially gaining access to sensitive operational data, configuration parameters, or control commands. The vulnerability enables a MITM attack scenario that could lead to unauthorized access to industrial processes, data manipulation, or disruption of critical manufacturing operations. Given the industrial context, this represents a significant risk to operational technology infrastructure and could compromise the security posture of entire production facilities.
Organizations should immediately implement mitigations including updating to patched versions of affected software components, reviewing and validating all TLS configurations, and implementing additional network security controls such as firewall rules that restrict communication to known good endpoints. The vulnerability aligns with CWE-295 which addresses improper certificate validation in security protocols, and maps to ATT&CK technique T1573.001 for Establishing Persistence through Secure Remote Access. System administrators should also conduct thorough network traffic analysis to detect potential exploitation attempts and implement certificate pinning mechanisms where feasible. Regular security assessments of third-party dependencies and their configuration practices should be performed to prevent similar vulnerabilities in the future.