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CVE-2024-21896 NodeJS CVE debrief

CVE-2024-21896 is a high-severity directory traversal vulnerability affecting Siemens SINEC INS, published on 2024-11-12. The vulnerability stems from Node.js Buffer internals manipulation, specifically through monkey-patching `Buffer.prototype.utf8Write`. An attacker exploiting this flaw can craft URL requests containing path traversal sequences (/../) to read arbitrary files on the affected system. The CVSS 3.1 score of 7.9 reflects significant confidentiality and integrity impact, though availability is not affected. Siemens has released a vendor fix in V1.0 SP2 Update 3 or later versions. This vulnerability is not currently listed in CISA's Known Exploited Vulnerabilities catalog.

Vendor
NodeJS
Product
SINEC INS
CVSS
HIGH 7.9
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 industrial network management systems, OT security teams managing critical infrastructure, Node.js application developers handling URL parsing, and security operations centers monitoring ICS environments for directory traversal indicators.

Technical summary

The vulnerability exists in how Node.js Buffer internals can be manipulated through prototype pollution of `Buffer.prototype.utf8Write`. When this internal method is monkey-patched, URL parsing behavior can be altered to bypass path normalization, allowing dot-dot-slash sequences to traverse outside intended directory boundaries. This enables remote attackers to read arbitrary files on the underlying system. The attack vector requires local access with low privileges and user interaction, but successful exploitation yields high impact on confidentiality and integrity through the directory traversal mechanism.

Defensive priority

HIGH

Recommended defensive actions

  • Apply Siemens vendor fix: update SINEC INS to V1.0 SP2 Update 3 or later version
  • Review and restrict network access to SINEC INS management interfaces
  • Monitor for anomalous URL requests containing path traversal sequences
  • Implement defense-in-depth controls per CISA ICS recommended practices
  • Validate input sanitization for URL handling in Node.js applications
  • Assess dependent systems for similar Buffer prototype manipulation risks

Evidence notes

Vulnerability description and remediation guidance sourced from CISA CSAF advisory ICSA-24-319-08. Vendor attribution confirmed through CSAF product tree data. CVSS vector and affected product details extracted from source advisory.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-21896 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-21896

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-21896 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-21896

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • CVE-2024-21896

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2024/icsa-24-319-08.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-915275.json

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-915275.html

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-24-319-08

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.