CVE-2021-37700 Information

Description

@github/paste-markdown is an npm package for pasting markdown objects. A self Cross-Site Scripting vulnerability exists in the @github/paste-markdown before version 0.3.4. If the clipboard data contains the string <table> a div is dynamically created and the clipboard content is copied into its innerHTML property without any sanitization resulting in improper execution of JavaScript in the browser of the victim (the user who pasted the code). Users directed to copy text from a malicious website and paste it into pages that utilize this library are affected. This is fixed in version 0.3.4. Refer the to the referenced GitHub Advisory for more details including an example exploit.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Reference

https://github.com/github/paste-markdown/releases/tag/v0.3.4 https://www.npmjs.com/package/@github/paste-markdown https://github.com/github/paste-markdown/security/advisories/GHSA-gpfj-4j6g-c4w9 https://github.com/github/paste-markdown/commit/32b7ea3f29ae8f256f9d19768387be42678ddf30

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

6.1