V-252537

Discussion

External writeable media devices must be disabled for users. External USB devices are a potential vector for malware and can be used to exfiltrate sensitive data. Satisfies: SRG-OS-000480-GPOS-00227, SRG-OS-000319-GPOS-00164

Check Content

Verify the system is configured to disable external writeable media devices:
$ /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/egrep -A 3 'blankbd|blankcd|blankdvd|dvdram|harddisk-external'

“blankbd" = (
deny,
eject
);

“blankcd" = (
deny,
eject
);

“blankdvd" = (
deny,
eject
);

“dvdram" = (
deny,
eject
);

“harddisk-external" = (
deny,
eject
);

If the result does not match the output above and the external writeable media devices have not been approved by the Authorizing Official, this is a finding.