Is 42Crunch good for Mobile backend BOLA testing?

BOLA (Broken Object Level Authorization) testing focuses on IDOR-style access control flaws where references to objects are not properly validated. The scanner checks for sequential ID enumeration by probing incremental identifiers and performs active adjacent-ID probing to observe differences in responses.

These checks map findings to OWASP API Top 10 controls related to authorization and are aligned with security controls described in PCI-DSS 4.0 and SOC 2 Type II. The scanner does not exploit or modify data; it observes whether different identifiers return distinct data without proper authorization checks.

For mobile backends where object references are often embedded in URLs or headers, this approach surfaces patterns where predictable references enable unauthorized data access. Detection is limited to read-only observations and does not include intrusive mutation tests.

Mobile backend APIs often serve sensitive user data, so the scanner adopts a strict read-only posture. Only GET and HEAD methods are used, with text-only POST reserved for LLM probe checks where supported and explicitly configured.

No destructive payloads are sent, and the scanner blocks requests to private IP addresses, localhost, and cloud metadata endpoints at multiple layers. This posture ensures safe validation of BOLA indicators without risking data modification or service disruption on mobile backend services.

Comprehensive BOLA testing on mobile backends typically requires authenticated scanning to evaluate authorization controls across user roles. Supported methods include Bearer tokens, API keys, Basic authentication, and Cookie-based sessions.

Authenticated scans require domain verification via DNS TXT record or an HTTP well-known file to confirm that only the domain owner can submit credentials. The scanner forwards a limited allowlist of headers, including Authorization, X-API-Key, Cookie, and X-Custom-* headers, reducing exposure of unrelated authentication data.

When an OpenAPI 3.0, 3.1, or Swagger 2.0 definition is provided, the parser resolves recursive $ref structures and cross-references declared paths and security schemes against runtime findings. This highlights undefined security schemes, deprecated operations, and missing pagination that can amplify BOLA risks.

For mobile backend APIs with formal specifications, this comparison helps identify discrepancies between documented authorization rules and actual endpoint behavior. The analysis supports audit evidence for control validation and helps you prepare for reviews aligned with security controls described in SOC 2 Type II and PCI-DSS 4.0.

The scanner does not perform active SQL injection or command injection tests, as those require intrusive payloads outside its scope. It also does not detect business logic vulnerabilities that require deep domain understanding, nor does it conduct blind SSRF testing that relies on out-of-band infrastructure.

For thorough BOLA assessment on mobile backends, these findings should complement manual review and targeted testing by security specialists. In high-stakes audit scenarios, a human pentester remains necessary to validate complex authorization chains and contextual controls.

For continuous monitoring of BOLA risks, the Pro tier offers scheduled rescans and diff detection to track new findings, resolved findings, and score drift over time.