V-4087

Discussion

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.

Check Content

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>/dev/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:%:%n" $FULLREF;done;done;
done|sort|uniq

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