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Outfaze Security Team

Outfaze Security Team

MOVEit Exploitation: Managing Third-Party Data Risk

MOVEit Exploitation: Managing Third-Party Data Risk

In June 2023, CISA and the FBI described CL0P exploitation of CVE-2023-34362 in internet-facing MOVEit Transfer systems. The campaign reached many organizations directly and indirectly through service providers that used the product.

The event showed that a file-transfer platform is not just another server. It can be a concentrated store of sensitive, recently exchanged data and a dependency shared across customers and suppliers.

One exposed transfer system created many data questions

Response required identifying vulnerable instances, patching, looking for exploitation, and determining what files and parties were affected. Organizations also had to ask vendors whether MOVEit was present in their own delivery chain.

Data-flow records became as important as asset inventory. Without file ownership, retention, transfer history, and partner contacts, notification scoping could take longer than technical containment.

Connect third-party and data-risk programs

Inventory managed transfer services, versions, owners, public exposure, authentication, stored data, and downstream users. Reduce unnecessary retention and isolate administrative access.

Contracts and playbooks should require prompt notice, evidence sharing, preservation, and coordinated customer communication. Validate vendor answers against available traffic, identity, and data records rather than waiting passively.

  • Treat file-transfer systems as high-value data repositories.
  • Track fourth-party use of critical software.
  • Minimize retained transfer data.
  • Predefine notification and evidence responsibilities.

Put the lesson into practice

  1. Find direct and supplier-operated MOVEit instances.
  2. Patch and hunt using current vendor and CISA guidance.
  3. Map accessed files to owners, people, and obligations.
  4. Remove unnecessary stored data and stale accounts.
  5. Update supplier incident clauses and exercises.

Related Outfaze guidance

Authoritative sources