CVE Vulnerability

CVE-2020-14000

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.

7.5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 6.4

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

Scope

9.8 /10

CVSS v3.0 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/LLK/scratch-vm/pull/2476 Third Party Advisory
https://scratch.mit.edu/discuss/topic/422904/?page=1#post-4223443 Vendor Advisory
Configurations

Configuration 1

cpe:2.3:a:mit:scratch-vm:*:*:*:*:*:*:*:*
Information

Published : 2020-07-16 03:15

Updated : 2020-07-24 03:02

NVD link : CVE-2020-14000

Mitre link : CVE-2020-14000

Products Affected
No products.
CWE
CWE-502

Deserialization of Untrusted Data