senaite.core Vulnerable to Eval Injection and Missing Authorization

Summary

An unauthenticated remote code execution vulnerability in the SENAITE JSON API allows any network-reachable attacker to execute arbitrary Python on the Zope worker process via a two-request anonymous chain. The /@@API/update route is reachable to anonymous callers and runs eval() on attacker-controlled input before any permission check fires.

This is a different code path from the eval() in the calculations module: no authenticated account of any kind is required.

Details

The vulnerability is the chain of two independent flaws. Either fix alone breaks the unauthenticated chain, but the eval sink remains exploitable by any authenticated user with write access to a RecordsField, so both fixes are needed.

1. Missing AccessJSONAPI gate on JSON API write routes (CWE-862). The route at src/bika/lims/jsonapi/update.py:45-165 does not enforce the senaite.core: Access JSON API permission upfront. Compare with the sibling create.py:179-182, which does:

if not getSecurityManager().checkPermission(AccessJSONAPI, parent):
    raise Unauthorized(...)