Device files and directories must only be writable by users with a system account or as configured by the vendor.

From SOLARIS 10 SPARC SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with: CCI-000225

SV-924r3_rule Device files and directories must only be writable by users with a system account or as configured by the vendor.

Vulnerability discussion

System device files in writable directories could be modified, removed, or used by an unprivileged user to control system hardware.

Check content

Find all device files existing anywhere on the system. Procedure: # find / -type b -print > devicelist # find / -type c -print >> devicelist Check the permissions on the directories above subdirectories containing device files. The following list of device files are intended to be world-writable and if present are not a finding. /dev/arp /dev/conslog /dev/crypto /dev/dtrace/dtrace /dev/dtrace/helper /dev/dtrace/provider/fasttrap /dev/fd/* /dev/kstat /dev/null /dev/poll /dev/pool /dev/ptmx /dev/sad/user /dev/tcp /dev/tcp6 /dev/ticlts /dev/ticots /dev/ticotsord /dev/tty /dev/udp /dev/udp6 /dev/zero /dev/zfs If any device file or their parent directory is world-writable and it is not intended to be world-writable, this is a finding.

Fix text

Remove the world-writable permission from the device file(s). Procedure: # chmod o-w Document all changes.

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.