Title

All system command files must have mode 0755 or less permissive. (Cat II impact)

Discussion

Restricting permissions will protect system command files from unauthorized modification. System command files include files present in directories used by the operating system for storing default system executables and files present in directories included in the system's default executable search paths.

Check Content

Check the permissions for files in /etc, /bin, /usr/bin, /usr/local/bin, /sbin, /usr/sbin and /usr/local/sbin. Procedure: # DIRS="/etc /bin /usr/bin /usr/local/bin /sbin /usr/sbin /usr/local/sbin";for DIR in $DIRS;do find $DIR -type f -perm +022 -exec stat -c %a:%n {} \;;done This will return the octal permissions and name of all group or world writable files. If any file listed is world or group writable (either or both of the 2 lowest order digits contain a 2, 3 or 6), this is a finding. Note: Elevate to Severity Code I if any file listed is world-writable.

Fix Text

Change the mode for system command files to 0755 or less permissive taking into account necessary GUID and SUID bits. Procedure: # chmod go-w <filename>

Additional Identifiers

Rule ID: SV-46272r1_rule

Vulnerability ID: V-794

Group Title: GEN001200

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.