资讯详情

Vulnerability call chain

1.1 Summary

DSpace has a missing authorization vulnerability: Relationship Creation Allows Unauthorized Author/Profile Binding. Unauthorized READ access to another in-progress item through forged author/profile relationship metadata

• Attack precondition: The attacker is an authenticated user who can write their own Person/Profile item. Researcher profile / shared workspace author metadata support is enabled
• Security impact: Unauthorized READ access to another in-progress item through forged author/profile relationship metadata

1.2 Exploit path

The attacker creates a relationship between their writable profile/person item and another in-progress publication item. Relationship creation accepts WRITE permission on either side, so the attacker does not need WRITE on the target publication item. The resulting author relationship can populate dc.contributor.author, and later permission logic treats the matching profile authority as an author-based READ grant

1.3 Key code evidence

1. dc.c

Evidence location: dc.c
2. RelationshipRestRepository.java

Evidence location: RelationshipRestRepository.java
3. RelationshipServiceImpl.java

Evidence location: RelationshipServiceImpl.java
4. relationshipDAO.c

Evidence location: relationshipDAO.c
5. AuthorizeServicePermissionEvaluatorPlugin.java

Evidence location: AuthorizeServicePermissionEvaluatorPlugin.java
6. ResearcherProfileServiceImpl.java

Evidence location: ResearcherProfileServiceImpl.java
7. discovery.xml

Evidence location: discovery.xml
8. virtual-metadata.xml

Evidence location: virtual-metadata.xml

3. Root Cause Analysis

Root Cause 1: Missing server-side authorization on the vulnerable operation.

The endpoint accepts user-controlled authorization-sensitive identifiers or fields, but the write/read path does not prove that the current caller may operate on the target object.

Root Cause 2: Missing object-scope or grant-bound validation.

The implementation relies on endpoint access, UI filtering, or object existence checks instead of enforcing target ownership, tenant boundary, role ceiling, or grantable-resource constraints at the service layer.

4. Recommended fix

Require authorization over both relationship endpoints for authorization-sensitive relationship types, or add a specific policy check that verifies the current user may assign the chosen profile/person as an author of the target item

5. Verification after fix

• Unauthorized callers receive HTTP 403 or equivalent rejection.
• Out-of-scope target identifiers are rejected before database writes or sensitive reads.
• Role, permission, tenant, organization, ownership, or grant-bound ceilings are enforced server-side.
• Direct HTTP requests are rejected even when front-end controls are hidden.