Mapped to NIST 800-171 Requirement: 3.13.7
CMMC Assessment Objective: SC.L2-3.13.7
What This Control Means
Systems often share resources between users or applications—like RAM, disk space, print queues, or temporary files. You must ensure that CUI cannot be accessed by other users or processes unintentionally through:
• Leftover data in shared memory
• Temp folders or cached files
• Virtualized environments with weak isolation
• Shared storage accessible by multiple tenants
The goal is to eliminate data residue and cross-user exposure risks.
Why It Matters
Without proper protections:
• CUI can be retrieved by another user after logout
• Malware can scrape memory or temp files for data remnants
• Print queues, logs, or cache directories may reveal sensitive content
• Virtual machines may leak data to other guests or the host
This control enforces secure data handling, separation, and cleanup.
How to Implement It
1. Use Role-Based Access and User Isolation
• Enforce least privilege
• Prevent one user’s process from accessing another’s memory or storage
2. Secure Shared Storage and Temp Locations
• Limit access to:
◦ /tmp, %TEMP%, shared drive folders
◦ Cloud storage buckets (e.g., S3)
• Automatically wipe or restrict access on session end
3. Harden Virtual and Multi-User Systems
• Isolate virtual machines
• Use secure multi-tenancy options for cloud platforms
• Disable or restrict clipboard, file sharing, or drag-and-drop features
4. Configure Print and Spool Services
• Clear print jobs immediately after completion
• Limit access to print history and queues
5. Monitor for Residual Data Risk
• Scan temp folders, caches, and logs for sensitive content
• Enable file and memory protection features on endpoints
Evidence the Assessor Will Look For
• Policies outlining protections against unintended data sharing
• System configuration showing user session isolation
• Logs showing session cleanup or memory clearance
• Technical controls limiting access to shared system resources
• Evidence of virtual machine isolation, cloud security hardening, or temp file protection
Common Gaps
• Temp or spool files left behind and accessible
• Users able to browse or write to shared system folders
• No memory cleanup at session end
• Weak separation between virtual machines or cloud tenants
How Cuick Trac Helps
Cuick Trac supports this requirement by:
• Documenting shared resource controls in your SSP
• Mapping where CUI may be temporarily stored in memory, temp files, or shared folders
• Tracking system configurations that restrict cross-user access
• Validating cleanup and isolation features through technical testing
• Helping align your shared system protections with NIST and CMMC best practices
With Cuick Trac, your shared resources don’t become shared vulnerabilities.
Final CTA
Shared systems require strict boundaries.
Schedule a Cuick Trac demo to secure your system resources and protect CUI from accidental exposure.