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-38505r2_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
HP-UX 11.31 Security Technical Implementation Guide	2018-09-14

Details

Check Text ( C-36415r2_chk )
Find all device special files existing anywhere on the system. Types include: b=block, c=character, p=fifo. Example: # find / -type b -print >> devicelist # find / -type c -print >> devicelist # find / -type p -print >> devicelist Check the permissions on the directories above subdirectories that contain device files. If any device file, or directory containing device files, is world-writable, except device files specifically intended to be world-writable such as /dev/null, this is a finding. Note the following exception/exclusion list: /dev/pts/, /dev/pty/, /dev/ptym/, the following in dev: full, zero, null, tty, ptmx, pty, tcp, udp, ip, arp, udp6, tcp6, rawip6, ip6, rawip, rtsock, ipsecpol, ipseckey, sad, dlpi, sasd, ttyp, ttyq, ttyr*, strlog, telnetm, tlclts, asyncdsk, async, tlcots, tlcotsod, echo, beep, gvid0, gvid, poll, log, log.um, stcpmap, nuls, usctp6, sctp6, usctp, syscon, and sctp.

Check Text ( C-36415r2_chk )

Find all device special files existing anywhere on the system. Types include: b=block, c=character, p=fifo.

Example:
# find / -type b -print >> devicelist
# find / -type c -print >> devicelist
# find / -type p -print >> devicelist

Check the permissions on the directories above subdirectories that contain device files. If any device file, or directory containing device files, is world-writable, except device files specifically intended to be world-writable such as /dev/null, this is a finding.

Note the following exception/exclusion list:

/dev/pts/*, /dev/pty/*, /dev/ptym/*, the following in dev: full, zero, null, tty, ptmx, pty*, tcp, udp, ip, arp, udp6, tcp6, rawip6, ip6, rawip, rtsock, ipsecpol, ipseckey, sad, dlpi*, sasd*, ttyp*, ttyq*, ttyr*, strlog, telnetm, tlclts, asyncdsk, async, tlcots, tlcotsod, echo, beep, gvid0, gvid, poll, log, log.um, stcpmap, nuls, usctp6, sctp6, usctp, syscon, and sctp.

Fix Text (F-31753r1_fix)
Remove the world-writable permission from the device file(s). # chmod o-w Document all changes.