Summary
DeepTutor 1.4.0 contains an authorization bypass in the book confirmation workflow. An unauthenticated or unauthorized caller who obtains a valid public book identifier may submit a confirmation request that overwrites stored metadata and spine content for an existing book.
DeepTutor 1.4.0 contains an authorization bypass in the book confirmation workflow. An unauthenticated or unauthorized caller who obtains a valid public book identifier may submit a confirmation request that overwrites stored metadata and spine content for an existing book.
Affected context
The vulnerability occurs in DeepTutor's book confirmation flow when the endpoint accepts a book identifier without reliably verifying that the requester is authorized to modify the associated book. Deployments are at risk when book identifiers are exposed or predictable and server-side authorization checks are missing or incomplete before persistence operations.
The vulnerability occurs in DeepTutor's book confirmation flow when the endpoint accepts a book identifier without reliably verifying that the requester is authorized to modify the associated book. Deployments are at risk when book identifiers are exposed or predictable and server-side authorization checks are missing or incomplete before persistence operations.
Exploit preconditions
- Attack surface: The book confirmation request endpoint
- Required access: No authentication may be required; otherwise, access as a user lacking permission for the target book may be sufficient
- Required information: A valid
book_idfor an existing book must be available - Trigger point: Submission of a confirm-proposal request
- Why exploitation is possible: The workflow does not consistently bind the requested book to an authorized owner, session, or permitted account before updating persistent content
- Attack surface: The book confirmation request endpoint
- Required access: No authentication may be required; otherwise, access as a user lacking permission for the target book may be sufficient
- Required information: A valid
book_idfor an existing book must be available - Trigger point: Submission of a confirm-proposal request
- Why exploitation is possible: The workflow does not consistently bind the requested book to an authorized owner, session, or permitted account before updating persistent content
Why this happens
The underlying defect is missing or ineffective server-side authorization in an object-level operation. The application uses a caller-controlled object reference, such as book_id, to identify a resource but fails to verify whether the caller has permission to confirm or modify that specific resource. This behavior maps to CWE-285: Improper Authorization, and may also resemble an insecure direct object reference when object access is controlled primarily by an exposed identifier.
The underlying defect is missing or ineffective server-side authorization in an object-level operation. The application uses a caller-controlled object reference, such as book_id, to identify a resource but fails to verify whether the caller has permission to confirm or modify that specific resource. This behavior maps to CWE-285: Improper Authorization, and may also resemble an insecure direct object reference when object access is controlled primarily by an exposed identifier.
Potential impact
- An unauthorized party may overwrite book metadata
- Existing spine content may be altered or replaced
- Content integrity and user trust may be compromised
- Malicious changes could propagate to downstream workflows or users
- Attackers could cause data loss, corruption, or service disruption
- An unauthorized party may overwrite book metadata
- Existing spine content may be altered or replaced
- Content integrity and user trust may be compromised
- Malicious changes could propagate to downstream workflows or users
- Attackers could cause data loss, corruption, or service disruption
General mitigation guidance
Mitigation generally centers on enforcing authorization at the resource and action level before any confirmation or persistence operation.
Common defensive patterns include:
- Performing server-side object-level authorization for every book confirmation request
- Binding book records to an authenticated owner, tenant, or permitted role
- Treating public or opaque identifiers as references rather than permission grants
- Rechecking authorization immediately before writing metadata or spine content
- Applying least-privilege access to service accounts and data stores
- Using transaction controls, validation, and audit records for sensitive content changes
- Reducing unnecessary exposure of resource identifiers and confirmation endpoints
Mitigation generally centers on enforcing authorization at the resource and action level before any confirmation or persistence operation.
Common defensive patterns include:
- Performing server-side object-level authorization for every book confirmation request
- Binding book records to an authenticated owner, tenant, or permitted role
- Treating public or opaque identifiers as references rather than permission grants
- Rechecking authorization immediately before writing metadata or spine content
- Applying least-privilege access to service accounts and data stores
- Using transaction controls, validation, and audit records for sensitive content changes
- Reducing unnecessary exposure of resource identifiers and confirmation endpoints
How teams detect issues like this
Organizations can look for authorization gaps through:
- Static analysis and code review checks for database writes keyed only by request-supplied identifiers
- Review of endpoint handlers that lack explicit ownership, tenant, role, or capability checks
- Tests that attempt cross-user and cross-tenant access to existing object identifiers
- API gateway and application policies requiring authentication and authorization metadata for state-changing routes
- Audit monitoring for confirmation requests that modify resources outside the caller's normal scope
- Automated security testing and code review tools that identify missing object-level authorization checks
Organizations can look for authorization gaps through:
- Static analysis and code review checks for database writes keyed only by request-supplied identifiers
- Review of endpoint handlers that lack explicit ownership, tenant, role, or capability checks
- Tests that attempt cross-user and cross-tenant access to existing object identifiers
- API gateway and application policies requiring authentication and authorization metadata for state-changing routes
- Audit monitoring for confirmation requests that modify resources outside the caller's normal scope
- Automated security testing and code review tools that identify missing object-level authorization checks
Sources
| Source | Link |
|---|---|
| gist. | gist.github.com/ |
| github. | github.com/ |
