GHSA-733v-p3h5-qpq7

Описание

Summary

A query cost restriction using the cost-limit can be bypassed if ignoreIntrospection is enabled (which is the default configuration) by naming your query/fragment __schema.

Details

At the start of the computeComplexity function, we have the following check for ignoreIntrospection option:

However, the node can be FieldNode | FragmentDefinitionNode | InlineFragmentNode | OperationDefinitionNode | FragmentSpreadNode

So, for example, sending the following query

would create an OperationDefinitionNode with node.name.value == 'hello'

The proper way to handle this would be to check for the __schema field, which would create a FieldNode.

The fix is

to assert that the node must be a FieldNode

PoC

Impact

Applications using GraphQL Armor Cost Limit plugin with ignoreIntrospection enabled.

Fix:

Fixed on 772. A quick patch would be to set ignoreIntrospection to false.