V-285671

Discussion

Preventing unauthorized information transfers mitigates the risk of information, including encrypted representations of information, produced by the actions of prior users/roles (or the actions of processes acting on behalf of prior users/roles) from being available to any current users/roles (or current processes) that obtain access to shared system resources (e.g., registers, main memory, hard disks) after those resources have been released back to information systems. The control of information in shared resources is also commonly referred to as object reuse and residual information protection. This requirement generally applies to the design of an information technology product, but it can also apply to the configuration of particular information system components that are, or use, such products. This can be verified by acceptance/validation processes in DoW or other government agencies. There may be shared resources with configurable protections (e.g., files in storage) that may be assessed on specific information system components.

Check Content

Verify the Harvester OS enforces protection against unauthorized and unintended information transfer via shared system resources. Inspect World-Writable Directories in "/tmp".

1. Access the node terminal with appropriate privileges and execute the following command:

find /tmp -type d -perm -002 -exec ls -ld {} \;

Example output:
drwxrwxrwt 1 root root 4096 Jun 14 06:45 /tmp

2. Review each returned directory and verify the following:

The directory has the sticky bit set, indicated by a "t" in the final position of the permissions string (e.g., drwxrwxrwt)
OR
The directory is authorized and documented to have world-writable permissions.

If any world-writable directory under "/tmp" does not have the sticky bit set or are not documented as having the write permission for the other class, this is a finding.