{"id":"CVE-2020-14000","aliases":[],"url":"https://o3.security/vulnerability/CVE-2020-14000","summary":"Remote Code Execution in scratch-vm","details":"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. \n\n**NOTE**: the scratch.mit.edu hosted service is not affected because of the lack of worker scripts.","published":"2020-07-27T19:55:52Z","modified":"2023-11-08T04:02:24.878433Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"scratch-vm","fixedVersion":"0.2.0-prerelease.20200714185213"}],"fix":{"url":"https://github.com/LLK/scratch-vm/pull/2476","label":"LLK/scratch-vm#2476"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-14000"},{"type":"WEB","url":"https://github.com/LLK/scratch-vm/pull/2476"},{"type":"WEB","url":"https://github.com/LLK/scratch-vm/pull/2476/commits/90b9da45f4084958535338d1c4d71a22d6136aab"},{"type":"PACKAGE","url":"https://github.com/LLK/scratch-vm"},{"type":"WEB","url":"https://scratch.mit.edu/discuss/topic/422904/?page=1#post-4223443"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2023-11-08T04:02:24.878433Z"}}