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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-924	GEN002280	SV-924r3_rule		Medium

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

STIG	Date
AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE	2018-09-18

Details

Check Text ( C-465r3_chk )

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 (F-1078r3_fix)
Remove the world-writable permission from the device file(s). Procedure: # chmod o-w Document all changes.