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How the CVE Works
The vulnerability in GraphQL Armor’s Cost Limit plugin allows attackers to bypass query cost restrictions by exploiting the `ignoreIntrospection` feature. By default, `ignoreIntrospection` skips cost calculation for `__schema` queries. However, the check only verifies the node’s name, not its type. An attacker can craft a malicious query or fragment named `__schema` (e.g., `OperationDefinitionNode` or FragmentDefinitionNode), tricking the system into assigning zero cost. The flawed logic fails to enforce that the node must be a FieldNode, enabling cost limit evasion.
DailyCVE Form
Platform: GraphQL Armor
Version: <1.7.2
Vulnerability: Cost Limit Bypass
Severity: Critical
Date: 2023-XX-XX
What Undercode Say:
Exploitation
1. Malicious Query Example:
query __schema {
books { author }
}
2. Fragment Exploit:
fragment __schema on Query {
books { }
}
Detection
1. Audit Logs:
grep -r "__schema" graphql_logs.json
2. GraphQL Schema Validation:
if (node.name?.value === '__schema' && node.kind !== 'Field') {
blockQuery();
}
Mitigation
1. Immediate Fix:
graphql-armor config costLimit: ignoreIntrospection: false
2. Patch Application:
npm update [email protected]
3. Rate Limiting:
app.use('/graphql', rateLimit({ max: 100 }));
4. Node Type Enforcement:
if (node.kind === 'Field' && node.name.value === '__schema') {
return 0;
}
References
- GitHub Commit: Fix commit 772
- CVE Details: CVE-2023-XXXX
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
