Permissions

• Permission octal numbers: r=4,w=2,x=1.
• 4000 or u+s means a suid which is executed by the owner of the file.
• World writable file o+w can also be exploited.

Finding These files

• Find suid find / -perm -4000 2>/dev/null
• Find world-writable in /etc/ find /etc/ -perm /o+w -type -f 2>/dev/null
• Finding a world-writable in the whole system find / -perm /o+w -type f -ls 2>/dev/null | grep -v sys | grep -v proc