Vulnerability in mlogclub bbs-go

[ Description ]Official description

bbs-go through 4.4.6 contains a permission bypass vulnerability in the AdminMiddleware authorization logic where the read-only dashboard.user.view permission rule matches the /api/admin/user/synccount endpoint before the intended dashboard.user.update rule. Authenticated users with only view permissions can call the synccount endpoint to trigger expensive full-table user recounts and cache invalidations, causing denial of service through repeated concurrent database operations.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/mlogclub/bbs-go
• github.com/mlogclub/bbs-go/blob/v4.4.6/internal/handlers/admin/user_handlers.go
• github.com/mlogclub/bbs-go/blob/v4.4.6/internal/permissions/admin_permission_registry.go
• github.com/mlogclub/bbs-go/commit/97d0bb3dcbacd686fd5300295afbf4f4a5da7609
• github.com/mlogclub/bbs-go/issues/303
• www.vulncheck.com/advisories/bbs-go-through-4.4.6-incorrect-authorization-via-api-admin…