User start-up files must not execute world-writable programs.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-4087	GEN001940	SV-37433r1_rule	DCSW-1	Medium

Description
If start-up files execute world-writable programs, especially in unprotected directories, they could be maliciously modified to become trojans that destroy user files or otherwise compromise the system at the user, or higher, level. If the system is compromised at the user level, it is much easier to eventually compromise the system at the root and network level.

STIG	Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide	2012-05-25

Details

Check Text ( C-36012r3_chk )
Check local initialization files for any executed world-writable programs or scripts and scripts executing from world writable directories. Procedure: For each home directory on the system make a list of files referenced within any local initialization script. Show the mode for each file and its parent directory. # FILES=".bashrc .bash_login .bash_logout .bash_profile .cshrc .kshrc .login .logout .profile .tcshrc .env .dtprofile .dispatch .emacs .exrc"; # for HOMEDIR in `cut -d: -f6 /etc/passwd\|sort\|uniq`;do for INIFILE in $FILES;do REFLIST=`egrep " [\"~]?/" ${HOMEDIR}/${INIFILE} 2>null\|sed "s/.\([~ \"]\/[\.0-9A-Za-z_\/\-]\)./\1/"`;for REFFILE in $REFLIST;do FULLREF=`echo $REFFILE\|sed "s:\~:${HOMEDIR}:g"\|sed "s:^\s::g"`;dirname $FULLREF\|xargs stat -c "dir:%a:%n";stat -c "file:%a:%n" $FULLREF;done;done;done\|sort\|uniq This command outputs a list of files and directories and their associated access modes. If any local initialization file executes a world-writable program or script or a script from a world-writable directory, this is a finding.

Check Text ( C-36012r3_chk )

Check local initialization files for any executed world-writable programs or scripts and scripts executing from world writable directories.

Procedure:
For each home directory on the system make a list of files referenced within any local initialization script.
Show the mode for each file and its parent directory.

# FILES=".bashrc .bash_login .bash_logout .bash_profile .cshrc .kshrc .login .logout .profile .tcshrc .env .dtprofile .dispatch .emacs .exrc";

# for HOMEDIR in `cut -d: -f6 /etc/passwd|sort|uniq`;do for INIFILE in $FILES;do REFLIST=`egrep " [\"~]?/" ${HOMEDIR}/${INIFILE} 2>null|sed "s/.*$[~ \"]\/[\.0-9A-Za-z_\/\-]*$.*/\1/"`;for REFFILE in $REFLIST;do FULLREF=`echo $REFFILE|sed "s:\~:${HOMEDIR}:g"|sed "s:^\s*::g"`;dirname $FULLREF|xargs stat -c "dir:%a:%n";stat -c "file:%a:%n" $FULLREF;done;done;done|sort|uniq

This command outputs a list of files and directories and their associated access modes.

If any local initialization file executes a world-writable program or script or a script from a world-writable directory, this is a finding.

Fix Text (F-31263r1_fix)
Remove the world-writable permission of files referenced by local initialization scripts, or remove the references to these files in the local initialization scripts.