QID 980744

QID 980744: Nodejs (npm) Security Update for scratch-vm (GHSA-vc9j-fhvv-8vrf)

MIT Lifelong Kindergarten Scratch scratch-vm before 0.2.0-prerelease.20200714185213 loads extension URLs from untrusted project.json files with certain _ characters, resulting in remote code execution because the URL's content is treated as a script and is executed as a worker. The responsible code is getExtensionIdForOpcode in serialization/sb3.js. The use of _ is incompatible with a protection mechanism in older versions, in which URLs were split and consequently deserialization attacks were prevented.
NOTE: the scratch.mit.edu hosted service is not affected because of the lack of worker scripts.

Successful exploitation of this vulnerability may affect the confidentiality, integrity, and availability of the targeted user.

  • CVSS V3 rated as Critical - 9.8 severity.
  • CVSS V2 rated as High - 7.5 severity.
    • Solution
    Customers are advised to refer to GHSA-vc9j-fhvv-8vrf for updates pertaining to this vulnerability.
    Vendor References

    CVEs related to QID 980744

    CVE-2020-14000 |
    Software Advisories
    Advisory ID Software Component Link
    GHSA-vc9j-fhvv-8vrf scratch-vm URL Logo github.com/advisories/GHSA-vc9j-fhvv-8vrf
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