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CVE-2023-39333 NodeJS CVE debrief

CVE-2023-39333 is a medium-severity vulnerability affecting Siemens SINEC INS, published on November 12, 2024. The vulnerability stems from maliciously crafted export names in imported WebAssembly modules that can inject JavaScript code. This injected code may access data and functions beyond the WebAssembly module's intended scope, effectively granting it privileges similar to a JavaScript module. The CVSS 3.1 score of 6.1 reflects network attack vector, low attack complexity, no required privileges, user interaction required, and changed scope with low impacts to confidentiality and integrity. Siemens has provided a vendor fix: update to V1.0 SP2 Update 3 or later version.

Vendor
NodeJS
Product
SINEC INS
CVSS
MEDIUM 6.1
CISA KEV
Not listed in stored evidence
Original CVE published
2024-11-12
Original CVE updated
2024-11-12
Advisory published
2024-11-12
Advisory updated
2024-11-12

Who should care

Organizations operating Siemens SINEC INS in industrial environments, OT security teams managing WebAssembly-enabled applications, and security architects designing isolation boundaries between WebAssembly and JavaScript execution contexts should prioritize this update. The vulnerability is particularly relevant for environments where untrusted or third-party WebAssembly modules may be imported.

Technical summary

The vulnerability exists in how SINEC INS handles imported WebAssembly modules. When a WebAssembly module contains maliciously crafted export names, the system fails to properly sanitize or isolate these names during the import process. This allows JavaScript code injection that executes with elevated privileges equivalent to a JavaScript module rather than being constrained to the WebAssembly sandbox. The attack requires user interaction to import a malicious module and has network attack vector with low complexity. Successful exploitation could allow unauthorized access to data and functions outside the WebAssembly module's intended scope, violating the security boundary between WebAssembly and JavaScript execution contexts.

Defensive priority

medium

Recommended defensive actions

  • Update Siemens SINEC INS to V1.0 SP2 Update 3 or later version as specified in the vendor security advisory
  • Review and validate WebAssembly module import handling in applications processing untrusted modules
  • Implement defense-in-depth controls for industrial control systems per CISA recommended practices
  • Monitor for anomalous JavaScript execution contexts that may indicate WebAssembly-based code injection
  • Apply network segmentation to limit exposure of SINEC INS systems to untrusted networks

Evidence notes

Vulnerability description and remediation details sourced from CISA CSAF advisory ICSA-24-319-08. Vendor fix confirmed by Siemens product security advisory SSA-915275. CVSS vector confirms medium severity with changed scope due to WebAssembly/JavaScript privilege boundary violation.

Official resources

2024-11-12