Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mit | Scratch-Vm | < 0.2.0-prerelease.20200714185213 |
Related Weaknesses (CWE)
References
- https://github.com/LLK/scratch-vm/pull/2476Third Party Advisory
- https://scratch.mit.edu/discuss/topic/422904/?page=1#post-4223443Vendor Advisory
- https://github.com/LLK/scratch-vm/pull/2476Third Party Advisory
- https://scratch.mit.edu/discuss/topic/422904/?page=1#post-4223443Vendor Advisory
FAQ
What is CVE-2020-14000?
CVE-2020-14000 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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...
How severe is CVE-2020-14000?
CVE-2020-14000 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2020-14000?
Check the references section above for vendor advisories and patch information. Affected products include: Mit Scratch-Vm.