Access Restriction Bypass Affecting xmlhttprequest-ssl package, versions <1.6.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-XMLHTTPREQUESTSSL-1255647
- published26 Apr 2021
- disclosed21 Apr 2021
- creditWes Garland
Introduced: 21 Apr 2021
CVE-2021-31597 (opens in a new tab)How to fix?
Upgrade xmlhttprequest-ssl to version 1.6.1 or higher.
Overview
xmlhttprequest-ssl is a fork of xmlhttprequest.
Affected versions of this package are vulnerable to Access Restriction Bypass. The package disables SSL certificate validation by default, because rejectUnauthorized (when the property exists but is undefined) is considered to be false within the https.request function of Node.js. In other words, no certificate is ever rejected.
PoC
const XMLHttpRequest = require('xmlhttprequest-ssl');
var xhr = new XMLHttpRequest(); /* pass empty object in version 1.5.4 to work around bug */
xhr.open("GET", "https://self-signed.badssl.com/");
xhr.addEventListener('readystatechange', () => console.log('ready state:', xhr.status));
xhr.addEventListener('loadend', loadend);
function loadend()
{
console.log('loadend:', xhr);
if (xhr.status === 0 && xhr.statusText.code === 'DEPTH_ZERO_SELF_SIGNED_CERT')
console.log('test passed: self-signed cert rejected');
else
console.log('*** test failed: self-signed cert used to retrieve content');
}
xhr.send();